M24128 M24C64 M24C32 128 Kbit, 64 Kbit and 32 Kbit serial IC bus EEPROM Features Two-wire I2C serial interface supports 400 kHz protocol Single supply voltages (see Table 1 for root part numbers): - 2.5 V to 5.5 V - 1.8 V to 5.5 V - 1.7 V to 5.5 V Write Control input Byte and Page Write Random and Sequential Read modes Self-timed programming cycle Automatic address incrementing Enhanced ESD/Latch-Up Protection More than 1 Million Write cycles More than 40-year data retention Packages - ECOPACK(R) (RoHS compliant) Table 1. Reference PDIP8 (BN) SO8 (MN) 150 mil width TSSOP8 (DW) 169 mil width Device summary Root part number Supply voltage M24128-BW 2.5 V to 5.5V M24128-BR 1.8 V to 5.5V M24C64-W 2.5 V to 5.5V M24C64-R 1.8 V to 5.5V M24C64-F 1.7 V to 5.5V M24C32-W 2.5 V to 5.5V M24C32-R 1.8 V to 5.5V M24C32-F 1.7 V to 5.5V M24128 M24C64 M24C32 April 2007 UFDFPN8 (MB) 2x3mm (MLP) Rev 10 1/35 www.st.com 1 Contents M24128, M24C64, M24C32 Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Signal description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.0.1 Serial Clock (SCL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.0.2 Serial Data (SDA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Chip Enable (E0, E1, E2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Write Control (WC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 Supply voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3.1 2.3.2 Operating supply voltage VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Internal device reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3.3 Power-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 Memory organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 Device operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 Start condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Stop condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.3 Acknowledge bit (ACK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.4 Data Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.5 Memory addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.6 Write operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.7 Byte Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.8 Page Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.9 Minimizing system delays by polling on ACK . . . . . . . . . . . . . . . . . . . . . . 17 4.10 Read operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.11 Random Address Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.12 Current Address Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.13 Sequential Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.14 Acknowledge in Read mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5 Initial delivery state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 6 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2/35 M24128, M24C64, M24C32 Contents 7 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8 Package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 9 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3/35 List of tables M24128, M24C64, M24C32 List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Table 16. Table 17. Table 18. Table 19. Table 20. Table 21. Table 22. Table 23. Table 24. Table 25. Table 26. Table 27. 4/35 Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Device select code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Address most significant byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Address least significant byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Operating conditions (M24128-BW, M24C64-W, M24C32-W) . . . . . . . . . . . . . . . . . . . . . . 21 Operating conditions (M24128-BR, M24C64-R, M24C32-R) . . . . . . . . . . . . . . . . . . . . . . . 21 Operating conditions (M24C64-F, M24C32-F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 AC test measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Input parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 DC characteristics (VCC = 2.5 V to 5.5 V, device grade 6) . . . . . . . . . . . . . . . . . . . . . . . . . 22 DC characteristics (VCC = 2.5 V to 5.5 V, device grade 3) . . . . . . . . . . . . . . . . . . . . . . . . . 23 DC characteristics (VCC = 1.8 V to 5.5 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 DC characteristics (VCC = 1.7 V to 5.5 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 AC characteristics (VCC = 2.5 V to 5.5 V or VCC = 1.8 V to 5.5 V) . . . . . . . . . . . . . . . . . . . 24 AC characteristics (VCC = 1.7 V to 5.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 PDIP8 - 8 pin Plastic DIP, 0.25 mm lead frame, package mechanical data . . . . . . . . . . . 27 SO8 narrow - 8 lead Plastic Small Outline, 150 mils body width, package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 TSSOP8 - 8 lead Thin Shrink Small Outline, package mechanical data . . . . . . . . . . . . . . 29 UFDFPN8 (MLP8) - 8-lead Ultra thin Fine pitch Dual Flat Package No lead 2 x 3mm, package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Available M24C32 products (package, voltage range, temperature grade) . . . . . . . . . . . . 32 Available M24C64 products (package, voltage range, temperature grade) . . . . . . . . . . . . 32 Available M24128 products (package, voltage range, temperature grade) . . . . . . . . . . . . 32 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 M24128, M24C64, M24C32 List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 DIP, SO, TSSOP and UFDFPN connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Device select code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Maximum RP value versus bus parasitic capacitance (C) for an I2C bus . . . . . . . . . . . . . . 9 I2C bus protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Write mode sequences with WC = 1 (data write inhibited) . . . . . . . . . . . . . . . . . . . . . . . . . 14 Write mode sequences with WC = 0 (data write enabled) . . . . . . . . . . . . . . . . . . . . . . . . . 16 Write cycle polling flowchart using ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Read mode sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 AC test measurement I/O waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 PDIP8 - 8 pin Plastic DIP, 0.25 mm lead frame, package outline . . . . . . . . . . . . . . . . . . . 27 SO8 narrow - 8 lead Plastic Small Outline, 150 mils body width, package outline . . . . . . 28 TSSOP8 - 8 lead Thin Shrink Small Outline, package outline . . . . . . . . . . . . . . . . . . . . . . 29 UFDFPN8 (MLP8) - 8-lead Ultra thin Fine pitch Dual Flat Package No lead 2 x 3mm, package outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5/35 Description 1 M24128, M24C64, M24C32 Description The M24C32, M24C64 and M24128 devices are I2C-compatible electrically erasable programmable memories (EEPROM). They are organized as 4096 x 8 bits, 8192 x 8 bits and 16384 x 8 bits, respectively. In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. ECOPACK(R) packages are Lead-free and RoHS compliant. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 1. Logic diagram VCC 3 E0-E2 SCL SDA M24128 M24C64 M24C32 WC VSS AI01844e I2C uses a two-wire serial interface, comprising a bi-directional data line and a clock line. The devices carry a built-in 4-bit Device Type Identifier code (1010) in accordance with the I2C bus definition. The device behaves as a slave in the I2C protocol, with all memory operations synchronized by the serial clock. Read and Write operations are initiated by a Start condition, generated by the bus master. The Start condition is followed by a Device Select Code and Read/Write bit (RW) (as described in Table 3), terminated by an acknowledge bit. When writing data to the memory, the device inserts an acknowledge bit during the 9th bit time, following the bus master's 8-bit transmission. When data is read by the bus master, the bus master acknowledges the receipt of the data byte in the same way. Data transfers are terminated by a Stop condition after an Ack for Write, and after a NoAck for Read. 6/35 M24128, M24C64, M24C32 Table 2. Description Signal names E0, E1, E2 Chip Enable SDA Serial Data SCL Serial Clock WC Write Control VCC Supply Voltage VSS Ground Figure 2. DIP, SO, TSSOP and UFDFPN connections E0 E1 E2 VSS M24128 M24C64 M24C32 1 8 2 7 3 6 4 5 VCC WC SCL SDA AI01845e 1. See Package mechanical section for package dimensions, and how to identify pin-1. 7/35 Signal description M24128, M24C64, M24C32 2 Signal description 2.0.1 Serial Clock (SCL) This input signal is used to strobe all data in and out of the device. In applications where this signal is used by slave devices to synchronize the bus to a slower clock, the bus master must have an open drain output, and a pull-up resistor must be connected from Serial Clock (SCL) to VCC. (Figure 4 indicates how the value of the pull-up resistor can be calculated). In most applications, though, this method of synchronization is not employed, and so the pullup resistor is not necessary, provided that the bus master has a push-pull (rather than open drain) output. 2.0.2 Serial Data (SDA) This bi-directional signal is used to transfer data in or out of the device. It is an open drain output that may be wire-OR'ed with other open drain or open collector signals on the bus. A pull up resistor must be connected from Serial Data (SDA) to VCC. (Figure 4 indicates how the value of the pull-up resistor can be calculated). 2.1 Chip Enable (E0, E1, E2) These input signals are used to set the value that is to be looked for on the three least significant bits (b3, b2, b1) of the 7-bit Device Select Code. These inputs must be tied to VCC or VSS, to establish the Device Select Code as shown in Figure 3. When not connected (left floating), these inputs are read as Low (0,0,0). Figure 3. Device select code VCC VCC M24xxx M24xxx Ei Ei VSS VSS Ai12806 2.2 Write Control (WC) This input signal is useful for protecting the entire contents of the memory from inadvertent write operations. Write operations are disabled to the entire memory array when Write Control (WC) is driven High. When unconnected, the signal is internally read as VIL, and Write operations are allowed. When Write Control (WC) is driven High, Device Select and Address bytes are acknowledged, Data bytes are not acknowledged. 8/35 M24128, M24C64, M24C32 Signal description 2.3 Supply voltage (VCC) 2.3.1 Operating supply voltage VCC Prior to selecting the memory and issuing instructions to it, a valid and stable VCC voltage within the specified [VCC(min), VCC(max)] range must be applied (see Table 9 and Table 10). In order to secure a stable DC supply voltage, it is recommended to decouple the VCC line with a suitable capacitor (usually of the order of 10nF to 100nF) close to the VCC/VSS package pins. This voltage must remain stable and valid until the end of the transmission of the instruction and, for a Write instruction, until the completion of the internal write cycle (tW). 2.3.2 Internal device reset In order to prevent inadvertent Write operations during Power-up, a Power On Reset (POR) circuit is included. At Power-up (continuous rise of VCC), the device does not respond to any instruction until VCC has reached the Power On Reset threshold voltage (this threshold is lower than the minimum VCC operating voltage defined in Table 9 and Table 10). When VCC has passed the POR threshold, the device is reset and is in Standby Power mode. Power-down At Power-down (continuous decrease of VCC), as soon as VCC drops from the normal operating voltage to below the Power On Reset threshold voltage, the device stops responding to any instruction sent to it. During Power-down, the device must be deselected and in the Standby Power mode (that is there should be no internal Write cycle in progress). Figure 4. Maximum RP value versus bus parasitic capacitance (C) for an I2C bus VCC 20 Maximum RP value (k) 2.3.3 16 RP 12 RP SDA MASTER 8 fc = 100kHz 4 fc = 400kHz C SCL C 0 10 100 1000 C (pF) AI01665b 9/35 Signal description Figure 5. M24128, M24C64, M24C32 I2C bus protocol SCL SDA SDA Input START Condition SCL 1 SDA MSB 2 SDA Change STOP Condition 3 7 8 9 ACK START Condition SCL 1 SDA MSB 2 3 7 8 9 ACK STOP Condition AI00792B Table 3. Device select code Device Type Identifier(1) Device Select Code Chip Enable Address(2) RW b7 b6 b5 b4 b3 b2 b1 b0 1 0 1 0 E2 E1 E0 RW 1. The most significant bit, b7, is sent first. 2. E0, E1 and E2 are compared against the respective external pins on the memory device. Table 4. b15 Table 5. b7 10/35 Address most significant byte b14 b13 b12 b11 b10 b9 b8 b3 b2 b1 b0 Address least significant byte b6 b5 b4 M24128, M24C64, M24C32 Memory organization The memory is organized as shown in Figure 6. Figure 6. Block diagram WC E0 E1 High Voltage Generator Control Logic E2 SCL SDA I/O Shift Register Address Register and Counter Data Register Y Decoder 3 Memory organization 1 Page X Decoder AI06899 11/35 Device operation 4 M24128, M24C64, M24C32 Device operation The device supports the I2C protocol. This is summarized in Figure 5. Any device that sends data on to the bus is defined to be a transmitter, and any device that reads the data to be a receiver. The device that controls the data transfer is known as the bus master, and the other as the slave device. A data transfer can only be initiated by the bus master, which will also provide the serial clock for synchronization. The M24C32, M24C64 and M24128 devices are always slaves in all communications. 4.1 Start condition Start is identified by a falling edge of Serial Data (SDA) while Serial Clock (SCL) is stable in the High state. A Start condition must precede any data transfer command. The device continuously monitors (except during a Write cycle) Serial Data (SDA) and Serial Clock (SCL) for a Start condition, and will not respond unless one is given. 4.2 Stop condition Stop is identified by a rising edge of Serial Data (SDA) while Serial Clock (SCL) is stable and driven High. A Stop condition terminates communication between the device and the bus master. A Read command that is followed by NoAck can be followed by a Stop condition to force the device into the Standby mode. A Stop condition at the end of a Write command triggers the internal Write cycle. 4.3 Acknowledge bit (ACK) The acknowledge bit is used to indicate a successful byte transfer. The bus transmitter, whether it be bus master or slave device, releases Serial Data (SDA) after sending eight bits of data. During the 9th clock pulse period, the receiver pulls Serial Data (SDA) Low to acknowledge the receipt of the eight data bits. 4.4 Data Input During data input, the device samples Serial Data (SDA) on the rising edge of Serial Clock (SCL). For correct device operation, Serial Data (SDA) must be stable during the rising edge of Serial Clock (SCL), and the Serial Data (SDA) signal must change only when Serial Clock (SCL) is driven Low. 12/35 M24128, M24C64, M24C32 4.5 Device operation Memory addressing To start communication between the bus master and the slave device, the bus master must initiate a Start condition. Following this, the bus master sends the Device Select Code, shown in Table 3 (on Serial Data (SDA), most significant bit first). The Device Select Code consists of a 4-bit Device Type Identifier, and a 3-bit Chip Enable "Address" (E2, E1, E0). To address the memory array, the 4-bit Device Type Identifier is 1010b. Up to eight memory devices can be connected on a single I2C bus. Each one is given a unique 3-bit code on the Chip Enable (E0, E1, E2) inputs. When the Device Select Code is received, the device only responds if the Chip Enable Address is the same as the value on the Chip Enable (E0, E1, E2) inputs. The 8th bit is the Read/Write bit (RW). This bit is set to 1 for Read and 0 for Write operations. If a match occurs on the Device Select code, the corresponding device gives an acknowledgment on Serial Data (SDA) during the 9th bit time. If the device does not match the Device Select code, it deselects itself from the bus, and goes into Standby mode. Table 6. Operating modes Mode Current Address Read RW bit WC(1) Bytes 1 Initial Sequence 1 X START, Device Select, RW = 1 Random Address Read 0 X 1 X Sequential Read 1 X 1 Byte Write 0 VIL 1 START, Device Select, RW = 0 Page Write 0 VIL 32 for M24C64 and M24C32 START, Device Select, RW = 0 START, Device Select, RW = 0, Address 1 reSTART, Device Select, RW = 1 Similar to Current or Random Address Read 64 for M24128 1. X = VIH or VIL. 13/35 Device operation Figure 7. M24128, M24C64, M24C32 Write mode sequences with WC = 1 (data write inhibited) WC ACK BYTE ADDR ACK BYTE ADDR NO ACK DATA IN STOP DEV SEL START BYTE WRITE ACK R/W WC ACK DEV SEL START PAGE WRITE ACK BYTE ADDR ACK BYTE ADDR NO ACK DATA IN 1 DATA IN 2 R/W WC (cont'd) NO ACK DATA IN N STOP PAGE WRITE (cont'd) NO ACK AI01120C 14/35 M24128, M24C64, M24C32 4.6 Device operation Write operations Following a Start condition the bus master sends a Device Select Code with the Read/Write bit (RW) reset to 0. The device acknowledges this, as shown in Figure 8, and waits for two address bytes. The device responds to each address byte with an acknowledge bit, and then waits for the data Byte. Writing to the memory may be inhibited if Write Control (WC) is driven High. Any Write instruction with Write Control (WC) driven High (during a period of time from the Start condition until the end of the two address bytes) will not modify the memory contents, and the accompanying data bytes are not acknowledged, as shown in Figure 7. Each data byte in the memory has a 16-bit (two byte wide) address. The Most Significant Byte (Table 4) is sent first, followed by the Least Significant Byte (Table 5). Bits b15 to b0 form the address of the byte in memory. When the bus master generates a Stop condition immediately after the Ack bit (in the "10th bit" time slot), either at the end of a Byte Write or a Page Write, the internal Write cycle is triggered. A Stop condition at any other time slot does not trigger the internal Write cycle. After the Stop condition, the delay tW, and the successful completion of a Write operation, the device's internal address counter is incremented automatically, to point to the next byte address after the last one that was modified. During the internal Write cycle, Serial Data (SDA) is disabled internally, and the device does not respond to any requests. 4.7 Byte Write After the Device Select code and the address bytes, the bus master sends one data byte. If the addressed location is Write-protected, by Write Control (WC) being driven High, the device replies with NoAck, and the location is not modified. If, instead, the addressed location is not Write-protected, the device replies with Ack. The bus master terminates the transfer by generating a Stop condition, as shown in Figure 8. 4.8 Page Write The Page Write mode allows up to 32 bytes (for the M24C32 and M24C64) or 64 bytes (for the M24128) to be written in a single Write cycle, provided that they are all located in the same 'row' in the memory: that is, the most significant memory address bits (b13-b6 for M24128, b12-b5 for M24C64, and b11-b5 for M24C32) are the same. If more bytes are sent than will fit up to the end of the row, a condition known as `roll-over' occurs. This should be avoided, as data starts to become overwritten in an implementation dependent way. The bus master sends from 1 to 32 bytes of data (for the M24C32 and M24C64) or 64 bytes of data (for the M24128), each of which is acknowledged by the device if Write Control (WC) is Low. If Write Control (WC) is High, the contents of the addressed memory location are not modified, and each data byte is followed by a NoAck. After each byte is transferred, the internal byte address counter (inside the page) is incremented. The transfer is terminated by the bus master generating a Stop condition. 15/35 Device operation Figure 8. M24128, M24C64, M24C32 Write mode sequences with WC = 0 (data write enabled) WC ACK BYTE ADDR ACK BYTE ADDR ACK DATA IN STOP DEV SEL START BYTE WRITE ACK R/W WC ACK DEV SEL START PAGE WRITE ACK BYTE ADDR ACK BYTE ADDR ACK DATA IN 1 DATA IN 2 R/W WC (cont'd) ACK DATA IN N STOP PAGE WRITE (cont'd) ACK AI01106C 16/35 M24128, M24C64, M24C32 Figure 9. Device operation Write cycle polling flowchart using ACK WRITE Cycle in Progress START Condition DEVICE SELECT with RW = 0 NO First byte of instruction with RW = 0 already decoded by the device ACK Returned YES NO Next Operation is Addressing the Memory YES Send Address and Receive ACK ReSTART STOP NO START Condition YES DATA for the WRITE Operation DEVICE SELECT with RW = 1 Continue the WRITE Operation Continue the Random READ Operation AI01847C 4.9 Minimizing system delays by polling on ACK During the internal Write cycle, the device disconnects itself from the bus, and writes a copy of the data from its internal latches to the memory cells. The maximum Write time (tw) is shown in Table 17 and Table 18, but the typical time is shorter. To make use of this, a polling sequence can be used by the bus master. The sequence, as shown in Figure 9, is: - Initial condition: a Write cycle is in progress. - Step 1: the bus master issues a Start condition followed by a Device Select Code (the first byte of the new instruction). - Step 2: if the device is busy with the internal Write cycle, no Ack will be returned and the bus master goes back to Step 1. If the device has terminated the internal Write cycle, it responds with an Ack, indicating that the device is ready to receive the second part of the instruction (the first byte of this instruction having been sent during Step 1). 17/35 Device operation M24128, M24C64, M24C32 Figure 10. Read mode sequences ACK DATA OUT STOP START DEV SEL NO ACK R/W ACK START DEV SEL * ACK BYTE ADDR ACK DEV SEL * ACK DATA OUT 1 ACK ACK NO ACK DATA OUT N BYTE ADDR ACK BYTE ADDR ACK DEV SEL * START START ACK R/W ACK DATA OUT R/W R/W DEV SEL * NO ACK STOP START DEV SEL SEQUENTIAL RANDOM READ BYTE ADDR R/W ACK SEQUENTIAL CURRENT READ ACK START RANDOM ADDRESS READ STOP CURRENT ADDRESS READ ACK DATA OUT 1 R/W NO ACK STOP DATA OUT N AI01105C 1. The seven most significant bits of the Device Select Code of a Random Read (in the 1st and 4th bytes) must be identical. 18/35 M24128, M24C64, M24C32 4.10 Device operation Read operations Read operations are performed independently of the state of the Write Control (WC) signal. After the successful completion of a Read operation, the device's internal address counter is incremented by one, to point to the next byte address. 4.11 Random Address Read A dummy Write is first performed to load the address into this address counter (as shown in Figure 10) but without sending a Stop condition. Then, the bus master sends another Start condition, and repeats the Device Select Code, with the Read/Write bit (RW) set to 1. The device acknowledges this, and outputs the contents of the addressed byte. The bus master must not acknowledge the byte, and terminates the transfer with a Stop condition. 4.12 Current Address Read For the Current Address Read operation, following a Start condition, the bus master only sends a Device Select Code with the Read/Write bit (RW) set to 1. The device acknowledges this, and outputs the byte addressed by the internal address counter. The counter is then incremented. The bus master terminates the transfer with a Stop condition, as shown in Figure 10, without acknowledging the Byte. 4.13 Sequential Read This operation can be used after a Current Address Read or a Random Address Read. The bus master does acknowledge the data byte output, and sends additional clock pulses so that the device continues to output the next byte in sequence. To terminate the stream of bytes, the bus master must not acknowledge the last byte, and must generate a Stop condition, as shown in Figure 10. The output data comes from consecutive addresses, with the internal address counter automatically incremented after each byte output. After the last memory address, the address counter `rolls-over', and the device continues to output data from memory address 00h. 4.14 Acknowledge in Read mode For all Read commands, the device waits, after each byte read, for an acknowledgment during the 9th bit time. If the bus master does not drive Serial Data (SDA) Low during this time, the device terminates the data transfer and switches to its Standby mode. 19/35 Initial delivery state 5 M24128, M24C64, M24C32 Initial delivery state The device is delivered with all bits in the memory array set to 1 (each byte contains FFh). 6 Maximum rating Stressing the device outside the ratings listed in Table 7 may cause permanent damage to the device. These are stress ratings only, and operation of the device at these, or any other conditions outside those indicated in the Operating sections of this specification, is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. Table 7. Absolute maximum ratings Symbol TA TSTG Parameter Min. Max. Unit Ambient operating temperature -40 130 C Storage temperature -65 150 C (1) C Lead temperature during soldering TLEAD (2) PDIP-specific lead temperature during soldering VIO Input or output range VCC Supply voltage VESD see note Electrostatic discharge voltage (human body model)(3) 260 -0.50 6.5 V -0.50 6.5 V -4000 4000 V 1. Compliant with JEDEC Std J-STD-020C (for small body, Sn-Pb or Pb assembly), the ST ECOPACK(R) 7191395 specification, and the European directive on Restrictions on Hazardous Substances (RoHS) 2002/95/EU. 2. TLEAD max must not be applied for more than 10s. 3. AEC-Q100-002 (compliant with JEDEC Std JESD22-A114A, C1=100pF, R1=1500, R2=500) 20/35 C M24128, M24C64, M24C32 7 DC and AC parameters DC and AC parameters This section summarizes the operating and measurement conditions, and the DC and AC characteristics of the device. The parameters in the DC and AC Characteristic tables that follow are derived from tests performed under the Measurement Conditions summarized in the relevant tables. Designers should check that the operating conditions in their circuit match the measurement conditions when relying on the quoted parameters. Table 8. Operating conditions (M24128-BW, M24C64-W, M24C32-W) Symbol VCC TA Table 9. Parameter Min. Max. Unit Supply voltage 2.5 5.5 V Ambient operating temperature (Device Grade 6) -40 85 C Ambient operating temperature (Device Grade 3) -40 125 C Operating conditions (M24128-BR, M24C64-R, M24C32-R) Symbol VCC TA Table 10. Parameter Min. Max. Unit Supply voltage 1.8 5.5 V Ambient operating temperature -40 85 C Min. Max. Unit Supply voltage 1.7 5.5 V Ambient operating temperature -20 85 C Min. Max. Unit Operating conditions (M24C64-F, M24C32-F) Symbol VCC TA Table 11. Parameter AC test measurement conditions Symbol CL Parameter Load capacitance 100 Input Rise and Fall times pF 50 ns Input levels 0.2VCC to 0.8VCC V Input and output timing reference levels 0.3VCC to 0.7VCC V Figure 11. AC test measurement I/O waveform Input Levels 0.8VCC 0.2VCC Input and Output Timing Reference Levels 0.7VCC 0.3VCC AI00825B 21/35 DC and AC parameters Table 12. M24128, M24C64, M24C32 Input parameters Symbol Parameter Test condition Min. Max. Unit CIN Input capacitance (SDA) 8 pF CIN Input capacitance (other pins) 6 pF 200 k ZWCL(1) WC input impedance VIN < 0.3VCC 50 ZWCH(1) WC input impedance VIN > 0.7VCC 500 tNS(1) k Pulse width ignored (Input filter on SCL and SDA) 200 ns 1. Characterized only. Table 13. Symbol DC characteristics (VCC = 2.5 V to 5.5 V, device grade 6) Parameter Test condition (in addition to those in Table 8) Max. Unit ILI Input Leakage Current (SCL, SDA, E2, E1, E0) VIN = VSS or VCC device in Standby mode 2 A ILO Output Leakage Current VOUT = VSS or VCC, SDA in Hi-Z 2 A ICC Supply Current (Read) 2.5 V < VCC < 5.5 V, fc = 400 kHz 2 mA During tW, 2.5 V < VCC < 5.5 V 5(1) mA Standby Supply Current VIN = VSS or VCC, VCC = 5.5 V 5 A Standby Supply Current VIN = VSS or VCC, VCC = 2.5 V 2 A 0.3VCC V 0.7VCC VCC+0.6 V ICC0 Supply Current (Write) ICC1 VIL Input Low Voltage (SDA, SCL, WC) VIH Input High Voltage (SDA, SCL, WC) VOL Output Low Voltage -0.45 IOL = 2.1 mA, VCC = 2.5 V or IOL = 3 mA, VCC = 5.5 V 1. Characterized value, not tested in production. 22/35 Min. 0.4 V M24128, M24C64, M24C32 Table 14. Symbol DC and AC parameters DC characteristics (VCC = 2.5 V to 5.5 V, device grade 3) Parameter Test condition (in addition to those in Table 8) Min. Max. Unit ILI Input Leakage Current (SCL, SDA, E2, E1, E0) VIN = VSS or VCC device in Standby mode 2 A ILO Output Leakage Current VOUT = VSS or VCC, SDA in Hi-Z 2 A ICC Supply Current (Read) 2.5 V < VCC < 5.5 V, fc = 400 kHz 2 mA (1) 5 mA 10 A 0.3VCC V 0.7VCC VCC+0.6 V ICC0 Supply Current (Write) ICC1 Standby Supply Current VIL Input Low Voltage (SDA, SCL, WC) VIH Input High Voltage (SDA, SCL, WC) VOL Output Low Voltage During tW, 2.5 V < VCC < 5.5 V VIN = VSS or VCC, 2.5 V < VCC < 5.5 V -0.45 IOL = 2.1 mA, VCC = 2.5 V or IOL = 3 mA, VCC = 5.5 V 0.4 V Max. Unit 1. Characterized value, not tested in production. Table 15. Symbol DC characteristics (VCC = 1.8 V to 5.5 V) Parameter Test condition (in addition to those in Table 9) Min. ILI Input Leakage Current (SCL, SDA, E2, E1, E0) VIN = VSS or VCC device in Standby mode 2 A ILO Output Leakage Current VOUT = VSS or VCC, SDA in Hi-Z 2 A ICC Supply Current (Read) VCC = 1.8 V, fc = 400 kHz 0.8 mA ICC0 Supply Current (Write) During tW, 1.8 V < VCC < 2.5 V 3(1) mA ICC1 Standby Supply Current VIN = VSS or VCC, 1.8 V < VCC < 2.5 V 1 A VIL Input Low Voltage (SDA, SCL, WC) -0.45 0.3 VCC V VIH Input High Voltage (SDA, SCL, WC) 0.7VCC VCC+0.6 V VOL Output Low Voltage 0.2 V IOL = 0.7 mA, VCC = 1.8 V 1. Characterized value, not tested in production. 23/35 DC and AC parameters Table 16. M24128, M24C64, M24C32 DC characteristics (VCC = 1.7 V to 5.5 V)(1) Symbol Test condition (in addition to those in Table 10) Parameter Min. Max. Unit ILI Input Leakage Current (SCL, SDA, E2, E1, E0) VIN = VSS or VCC device in Standby mode 2 A ILO Output Leakage Current VOUT = VSS or VCC, SDA in Hi-Z 2 A ICC Supply Current (Read) VCC =1.7 V, fc = 400 kHz 0.8 mA (2) mA 1 A ICC0 Supply Current (Write) ICC1 Standby Supply Current VIL Input Low Voltage (SDA, SCL, WC) -0.45 0.3 VCC V VIH Input High Voltage (SDA, SCL, WC) 0.7VCC VCC+0.6 V VOL Output Low Voltage 0.2 V During tW, 1.7 V < VCC < 2.5 V 3 VIN = VSS or VCC, 1.7 V < VCC < 2.5 V IOL = 0.7 mA, VCC = 1.7 V 1. Preliminary data. 2. Characterized value, not tested in production. Table 17. AC characteristics (VCC = 2.5 V to 5.5 V or VCC = 1.8 V to 5.5 V) Test conditions specified in Table 11 and Table 8 Symbol Alt. Parameter fC fSCL Clock Frequency tCHCL tHIGH Clock Pulse Width High 600 ns tCLCH tLOW Clock Pulse Width Low 1300 ns tDL1DL2(1) tF SDA Fall Time tDXCX tSU:DAT Data In Set Up Time tCLDX tHD:DAT Data In Hold Time tCLQX tCLQV (2) tCHDX(3) Min. 20 Max. Unit 400 kHz 300 100 ns 0 ns ns tDH Data Out Hold Time 200 tAA Clock Low to Next Data Valid (Access Time) 200 900 ns tSU:STA Start Condition Set Up Time 600 ns tDLCL tHD:STA Start Condition Hold Time 600 ns tCHDH tSU:STO Stop Condition Set Up Time 600 ns tDHDL tW tBUF tWR Time between Stop condition and next Start condition Write Time 1300 ns (4) 5 1. Sampled only, not 100% tested. 2. To avoid spurious START and STOP conditions, a minimum delay is placed between SCL=1 and the falling or rising edge of SDA. 3. For a reSTART condition, or following a Write cycle. 4. For production lots assembled from 1st July 2007 (data code 727: week27, year 2007), the M24xxx-R (1.8 V to 5.5 V range) memories are specified with tW = 5 ms (instead of 10ms). 24/35 ns ms M24128, M24C64, M24C32 Table 18. DC and AC parameters AC characteristics (VCC = 1.7 V to 5.5 V) Test conditions specified in Table 11 and Table 9 or Table 10 Symbol Alt. fC fSCL Clock Frequency tCHCL tHIGH Clock Pulse Width High 600 ns tCLCH tLOW Clock Pulse Width Low 1300 ns tDL1DL2 (1) tF Parameter SDA Fall Time tDXCX tSU:DAT Data In Set Up Time tCLDX tHD:DAT Data In Hold Time Min. 20 Max. Unit 400 kHz 300 ns 100 ns 0 ns ns tCLQX tDH Data Out Hold Time 200 tCLQV(2) tCHDX(3) tAA Clock Low to Next Data Valid (Access Time) 200 900 ns tSU:STA Start Condition Set Up Time 600 ns tDLCL tHD:STA Start Condition Hold Time 600 ns tCHDH tSU:STO Stop Condition Set Up Time 600 ns 1300 ns tDHDL tBUF Time between Stop Condition and Next Start Condition tW tWR Write Time 10 ms 1. Sampled only, not 100% tested. 2. To avoid spurious START and STOP conditions, a minimum delay is placed between SCL=1 and the falling or rising edge of SDA. 3. For a reSTART condition, or following a Write cycle. 25/35 DC and AC parameters M24128, M24C64, M24C32 Figure 12. AC waveforms tCHCL tCLCH SCL tDLCL SDA In tCHDX tCLDX START Condition SDA Input SDA tDXCX Change tCHDH tDHDL START STOP Condition Condition SCL SDA In tCHDH tW STOP Condition Write Cycle tCHDX START Condition SCL tCLQV SDA Out tCLQX Data Valid AI00795C 26/35 M24128, M24C64, M24C32 8 Package mechanical Package mechanical Figure 13. PDIP8 - 8 pin Plastic DIP, 0.25 mm lead frame, package outline E b2 A2 A1 b A L c e eA eB D 8 E1 1 PDIP-B 1. Drawing is not to scale. Table 19. PDIP8 - 8 pin Plastic DIP, 0.25 mm lead frame, package mechanical data millimeters inches Symbol Typ. Min. A Max. Typ. Min. 5.33 A1 Max. 0.210 0.38 0.015 A2 3.30 2.92 4.95 0.130 0.115 0.195 b 0.46 0.36 0.56 0.018 0.014 0.022 b2 1.52 1.14 1.78 0.060 0.045 0.070 c 0.25 0.20 0.36 0.010 0.008 0.014 D 9.27 9.02 10.16 0.365 0.355 0.400 E 7.87 7.62 8.26 0.310 0.300 0.325 E1 6.35 6.10 7.11 0.250 0.240 0.280 e 2.54 - - 0.100 - - eA 7.62 - - 0.300 - - eB L 10.92 3.30 2.92 3.81 0.430 0.130 0.115 0.150 27/35 Package mechanical M24128, M24C64, M24C32 Figure 14. SO8 narrow - 8 lead Plastic Small Outline, 150 mils body width, package outline h x 45 A2 A c ccc b e 0.25 mm GAUGE PLANE D k 8 E1 E 1 L A1 L1 SO-A 1. Drawing is not to scale. Table 20. SO8 narrow - 8 lead Plastic Small Outline, 150 mils body width, package mechanical data millimeters inches Symbol Typ Min A Typ Min 1.75 Max 0.069 A1 0.10 A2 1.25 b 0.28 0.48 0.011 0.019 c 0.17 0.23 0.007 0.009 ccc 0.25 0.004 0.010 0.049 0.10 0.004 D 4.90 4.80 5.00 0.193 0.189 0.197 E 6.00 5.80 6.20 0.236 0.228 0.244 E1 3.90 3.80 4.00 0.154 0.150 0.157 e 1.27 - - 0.050 - - h 0.25 0.50 0.010 0.020 k 0 8 0 8 L 0.40 1.27 0.016 0.050 L1 28/35 Max 1.04 0.041 M24128, M24C64, M24C32 Package mechanical Figure 15. TSSOP8 - 8 lead Thin Shrink Small Outline, package outline D 8 5 c E1 1 E 4 A1 A L A2 L1 CP b e TSSOP8AM 1. Drawing is not to scale. Table 21. TSSOP8 - 8 lead Thin Shrink Small Outline, package mechanical data millimeters inches Symbol Typ. Min. A Max. Min. 1.200 A1 0.050 0.150 0.800 1.050 b 0.190 c 0.090 A2 Typ. 1.000 CP Max. 0.0472 0.0020 0.0059 0.0315 0.0413 0.300 0.0075 0.0118 0.200 0.0035 0.0079 0.0394 0.100 0.0039 D 3.000 2.900 3.100 0.1181 0.1142 0.1220 e 0.650 - - 0.0256 - - E 6.400 6.200 6.600 0.2520 0.2441 0.2598 E1 4.400 4.300 4.500 0.1732 0.1693 0.1772 L 0.600 0.450 0.750 0.0236 0.0177 0.0295 L1 1.000 0 8 0.0394 0 8 29/35 Package mechanical M24128, M24C64, M24C32 Figure 16. UFDFPN8 (MLP8) - 8-lead Ultra thin Fine pitch Dual Flat Package No lead 2 x 3mm, package outline e D b L1 L3 E E2 L A D2 ddd A1 UFDFPN-01 1. Drawing is not to scale. Table 22. UFDFPN8 (MLP8) - 8-lead Ultra thin Fine pitch Dual Flat Package No lead 2 x 3mm, package mechanical data millimeters inches Symbol Typ Min Max Typ Min Max A 0.55 0.50 0.60 0.022 0.020 0.024 A1 0.02 0.00 0.05 0.001 0.000 0.002 b 0.25 0.20 0.30 0.010 0.008 0.012 D 2.00 1.90 2.10 0.079 0.075 0.083 D2 1.60 1.50 1.70 0.063 0.059 0.067 ddd 0.08 E 3.00 2.90 3.10 0.118 0.114 0.122 E2 0.20 0.10 0.30 0.008 0.004 0.012 e 0.50 - - 0.020 - - L 0.45 0.40 0.50 0.018 0.016 0.020 L1 L3 30/35 0.003 0.15 0.30 0.006 0.012 M24128, M24C64, M24C32 9 Part numbering Part numbering Table 23. Ordering information scheme Example: M24C32- W MN 6 T P /B Device type M24 = I2C serial access EEPROM Device function 128-B = 128 Kbit (16384 x 8) C64- = 64 Kbit (8192 x 8) C32- = 32 Kbit (4096 x 8) Operating voltage W = VCC = 2.5 V to 5.5 V R = VCC = 1.8 V to 5.5 V F = VCC = 1.7 V to 5.5 V Package BN = PDIP8 MN = SO8 (150 mil width) DW = TSSOP8 (169 mil width) MB = UFDFPN8 (MLP8) Device grade 6 = Industrial: device tested with standard test flow over -40 to 85 C 3 = Automotive: device tested with High Reliability Certified Flow(1) over -40 to 125C. 5 = Consumer: device tested with standard test flow over -20 to 85C Option blank = Standard Packing T = Tape and Reel Packing Plating technology blank = Standard SnPb plating P or G = ECOPACK(R) (RoHS compliant) Process B = F6DP26% Rousset P = F6DP26% Chartered C = F6DP26% AmMokio 1. ST strongly recommends the use of the Automotive Grade devices for use in an automotive environment. The High Reliability Certified Flow (HRCF) is described in the quality note QNEE9801. Please ask your nearest ST sales office for a copy. For a list of available options (speed, package, etc.) or for further information on any aspect of this device, please contact your nearest ST Sales Office. The category of Second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. 31/35 Part numbering M24128, M24C64, M24C32 Table 24. Package M24C32-F 1.7 V to 5.5 V M24C32-R 1.8 V to 5.5 V M24C32-W 2.5 V to 5.5 V DIP8 (BN) - - Grade6 SO8N (MN) - Grade 6 Grade 3 Grade 6 TSSOP8 (DW) Grade 5 Grade 6 Grade 6 MLP8 (MB) Grade 5 Grade 6 - Table 25. Available M24C64 products (package, voltage range, temperature grade) Package M24C64-F 1.7 V to 5.5 V M24C64-R 1.8 V to 5.5 V M24C64-W 2.5 V to 5.5 V DIP8 (BN) - - Grade 6 SO8N (MN) - Grade 6 Grade 3 Grade 6 TSSOP8 (DW) Grade 5 Grade 6 Grade 6 MLP8 (MB) - - - Table 26. 32/35 Available M24C32 products (package, voltage range, temperature grade) Available M24128 products (package, voltage range, temperature grade) Package M24128-BR 1.8 V to 5.5 V M24128-BW 2.5 V to 5.5 V DIP8 (BN) - - SO8N (MN) Grade 6 Grade 3 Grade 6 TSSOP8 (DW) Grade 6 Grade 6 MLP8 (MB) - - M24128, M24C64, M24C32 10 Revision history Revision history Table 27. Document revision history Date Revision Changes 22-Dec-1999 2.3 TSSOP8 package in place of TSSOP14 (pp 1, 2, OrderingInfo, PackageMechData). 28-Jun-2000 2.4 TSSOP8 package data corrected 31-Oct-2000 2.5 References to Temperature Range 3 removed from Ordering Information Voltage range -S added, and range -R removed from text and tables throughout. 20-Apr-2001 2.6 Lead Soldering Temperature in the Absolute Maximum Ratings table amended Write Cycle Polling Flow Chart using ACK illustration updated References to PSDIP changed to PDIP and Package Mechanical data updated 16-Jan-2002 2.7 Test condition for ILI made more precise, and value of ILI for E2-E0 and WC added -R voltage range added 02-Aug-2002 2.8 Document reformatted using new template. TSSOP8 (3x3mm body size) package (MSOP8) added. 5ms write time offered for 5V and 2.5V devices 04-Feb-2003 2.9 SO8W package removed. -S voltage range removed 27-May-2003 2.10 TSSOP8 (3x3mm body size) package (MSOP8) removed 22-Oct-2003 3.0 Table of contents, and Pb-free options added. Minor wording changes in Summary Description, Power-On Reset, Memory Addressing, Write Operations, Read Operations. VIL(min) improved to -0.45V. 01-Jun-2004 4.0 Absolute Maximum Ratings for VIO(min) and VCC(min) improved. Soldering temperature information clarified for RoHS compliant devices. Device Grade clarified 04-Nov-2004 5.0 Product List summary table added. Device Grade 3 added. 4.5-5.5V range is Not for New Design. Some minor wording changes. AEC-Q100002 compliance. tNS(max) changed. VIL(min) is the same on all input pins of the device. ZWCL changed. 05-Jan-2005 6.0 UFDFPN8 package added. Small text changes. 33/35 Revision history M24128, M24C64, M24C32 Table 27. Document revision history (continued) Date 29-Jun-2006 03-Jul-2006 17-Oct-2006 27-Apr-2007 34/35 Revision Changes 7 Document converted to new ST template. M24C32 and M24C64 products (4.5 to 5.5V supply voltage) removed. M24C64 and M24C32 products (1.7 to 5.5V supply voltage) added. Section 2.1: Chip Enable (E0, E1, E2) and Section 2.2: Write Control (WC) modified, Section 2.3: Supply voltage (VCC) added and replaces Power On Reset: VCC Lock-Out Write Protect section. TA added, Note 1 updated and TLEAD specified for PDIP packages in Table 7: Absolute maximum ratings. ICC0 added, ICC voltage conditions changed and ICC1 specified over the whole voltage range in Table 13: DC characteristics (VCC = 2.5 V to 5.5 V, device grade 6). ICC0 added, ICC frequency conditions changed and ICC1 specified over the whole voltage range in Table 15: DC characteristics (VCC = 1.8 V to 5.5 V). tW modified in Table 17: AC characteristics (VCC = 2.5 V to 5.5 V or VCC = 1.8 V to 5.5 V). SO8N package specifications updated (see Figure 14 and Table 20). Device grade 5 added, B and P Process letters added to Table 23: Ordering information scheme. Small text changes. 8 ICC1 modified in Table 13: DC characteristics (VCC = 2.5 V to 5.5 V, device grade 6). Note 1 added to Table 16: DC characteristics (VCC = 1.7 V to 5.5 V) and table title modified. 9 UFDFPN8 package specifications updated (see Table 22). M24128-BWand M24128-BR part numbers added. Generic part number corrected in Features on page 1. ICC0 corrected in Table 14 and Table 13. Packages are ECOPACK(R) compliant. 10 Available packages and temperature ranges by product specified in Table 24, Table 25 and Table 26. Notes modified below Table 12: Input parameters. VIH max modified in DC characteristics tables (see Table 13, Table 14, Table 15 and Table 16). C process code added to Table 23: Ordering information scheme. For M24xxx-R (1.8 V to 5.5 V range) products assembled from July 2007 on, tW will be 5 ms (see Table 17: AC characteristics (VCC = 2.5 V to 5.5 V or VCC = 1.8 V to 5.5 V). M24128, M24C64, M24C32 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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