AT25128AN-10SN-2.7 - Atmel Corporation

Features

•Serial Peripheral Interface (SPI) Compatible

•Supports SPI Modes 0 (0,0) and 3 (1,1)

– Data Sheet Describes Mode 0 Operation

•Medium-voltage and Standard-voltage Operation

– 5.0 (VCC = 4.5V to 5.5V)

– 2.7 (VCC = 2.7V to 5.5V)

•Automotive Temperature Range −40°C to +125°C

•5 MHz Clock Rate

•64-byte Page Mode and Byte Write Operation

•Block Write Protection

– Protect 1/4, 1/2, or Entire Array

•Write Protect (WP) Pin and Write Disable Instructions for both Hardware and Software

Data Protection

•Self-timed Write Cycle (5 ms max)

•High Reliability

– Endurance: 1 Million Write Cycles

– Data Retention: >100 Years

•8-lead PDIP, 8-lead JEDEC SOIC, and 8-lead TSSOP Packages

Description

The AT25128A/256A provides 131,072/262,144 bits of serial electrically-erasable pro-

grammable read-only memory (EEPROM) organized as 16,384/32,768 words of 8 bits

each. The device is optimized for use in many industrial and automotive applications

where low-power and low-voltage operation are essential. The devices are available in

space-saving 8-lead PDIP, 8-lead JEDEC SOIC, and 8-lead TSSOP packages.

The AT25128A/256A is enabled through the Chip Select pin (CS) and accessed via a

three-wire interface consisting of Serial Data Input (SI), Serial Data Output (SO), and

Serial Clock (SCK). All programming cycles are completely self-timed, and no sepa-

rate erase cycle is required before write.

Table 1. Pin Configurations

Pin Name Function

CS Chip Select

SCK Serial Data Clock

SI Serial Data Input

SO Serial Data Output

GND Ground

VCC Power Supply

WP Write Protect

HOLD Suspends Serial Input

NC No Connect

DC Don't Connect

5088E–SEEPR–10/05

SPI Serial

Automotive

Temperature

EEPROMs

128K (16,384 x 8)

256K (32,768 x 8)

AT25128A

AT25256A

8-Lead PDIP

8-lead SOIC

8-lead TSSOP

GND

VCC

HOLD

SCK

GND

VCC

HOLD

SCK

GND

VCC

HOLD

SCK

2AT25128A/256A

5088E–SEEPR–10/05

Block write protection is enabled by programming the status register with top one-forth,

top one-half, or entire array of write protection. Separate program enable and program

disable instructions are provided for additional data protection. Hardware data protec-

tion is provided via the WP pin to protect against inadvertent write attempts to the status

resetting the serial sequence

Figure 1. Block Diagram

Absolute Maximum Ratings*

Operating Temperature......................................−40°C to +125°C*NOTICE: Stresses beyond those listed under “Absolute Maxi-

mum Ratings” may cause permanent damage to the

device. This is a stress rating only and functional

operation of the device at these or any other condi-

tions beyond those indicated in the operational sec-

tions of this specification is not implied. Exposure to

absolute maximum rating conditions for extended

periods may affect device reliability.

Storage Temperature .........................................−65°C to +150°C

Voltage on Any Pin

with Respect to Ground ........................................ −1.0V to +7.0V

Maximum Operating Voltage .......................................... 6.25V

DC Output Current........................................................ 5.0 mA

16384/32768 x 8

AT25128A/256A

5088E–SEEPR–10/05

Note: 1. This parameter is characterized and is not 100% tested.

Note: 1. Maximum value at +125°C

2. VIL and VIH max are reference only and are not tested.

Table 2. Pin Capacitance(1)

Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, VCC = +5.0V (unless otherwise noted)

Symbol Test Conditions Max Units Conditions

COUT Output Capacitance (SO) 8 pF VOUT = 0V

CIN Input Capacitance (CS, SCK, SI, WP, HOLD)6pFV

IN = 0V

Table 3. DC Characteristics

Applicable over recommended operating range from TA = −40°C to +125°C, VCC = +2.7V to +5.5V

Symbol Parameter Test Condition Min Typ Max Units

VCC1 Supply Voltage 2.7 5.5 V

VCC2 Supply Voltage 4.5 5.5 V

ICC1 Supply Current VCC = 5.0V at 1 MHz, SO = Open, Read 2.0 3.0 mA

ICC2 Supply Current VCC = 5.0V at 2 MHz,

SO = Open, Read, Write 3.0 5.0 mA

ICC3 Supply Current VCC = 5.0V at 5 MHz,

SO = Open, Read, Write 3.5 6.0 mA

ISB1 Standby Current VCC = 2.7V, CS = VCC 0.5 12.0(1) µA

ISB2 Standby Current VCC = 5.0V, CS = VCC 2.0 15.0(1) µA

IIL Input Leakage VIN = 0V to VCC −3.0 3.0 µA

IOL Output Leakage VIN = 0V to VCC −3.0 3.0 µA

VIL(2) Input Low-voltage −1.0 VCC x 0.3 V

VIH(2) Input High-voltage VCC x 0.7 VCC + 0.5 V

VOL1 Output Low-voltage 3.6 ≤ VCC ≤ 5.5V IOL = 3.0 mA 0.4 V

VOL2 Output Low-voltage 2.7≤ VCC ≤ 3.6V IOL = 0.15mA 0.2 V

VOH1 Output High-voltage 3.6 ≤ VCC ≤ 5.5V IOH = −1.6 mA VCC −0.8 V

VOH2 Output High-voltage 2.7≤ VCC ≤ 3.6V IOH = −100 mA VCC −0.2 V

4AT25128A/256A

5088E–SEEPR–10/05

Note: 1. This parameter is ensured by characterization only.

Table 4. AC Characteristics

Applicable over recommended operating range from TA = −40°C to +125°C, VCC = As Specified,

CL = 1 TTL Gate and 100 pF (unless otherwise noted)

Symbol Parameter Voltage Min Max Units

fSCK SCK Clock Frequency 2.7–5.5 0 5.0 MHz

tRI Input Rise Time 2.7–5.5 2 µs

tFI Input Fall Time 2.7–5.5 2 µs

tWH SCK High Time 2.7–5.5 40 ns

tWL SCK Low Time 2.7–5.5 40 ns

tCS CS High Time 2.7–5.5 80 ns

tCSS CS Setup Time 2.7–5.5 80 ns

tCSH CS Hold Time 2.7–5.5 80 ns

tSU Data In Setup Time 2.7–5.5 5 ns

tH Data In Hold Time 2.7–5.5 20 ns

tHD Hold Setup Time 2.7–5.5 40 ns

tCD Hold Hold Time 2.7–5.5 40 ns

tVOutput Valid 2.7–5.5 0 40 ns

tHO Output Hold Time 2.7–5.5 0 ns

tLZ Hold to Output Low Z 2.7–5.5 0 40 ns

tHZ Hold to Output High Z 2.7–5.5 80 ns

tDIS Output Disable Time 2.7–5.5 80 ns

tWC Write Cycle Time 2.7–5.5 5 ms

Endurance(1) 5.0V, 25°C, Page Mode 1M Write Cycles

AT25128A/256A

5088E–SEEPR–10/05

Serial Interface

Description

MASTER: The device that generates the serial clock.

SLAVE: Because the serial clock pin (SCK) is always an input, the AT25128A/256A

always operates as a slave.

TRANSMITTER/RECEIVER: The AT25128A/256A has separate pins designated for

data transmission (SO) and reception (SI).

MSB: The Most Significant Bit (MSB) is the first bit transmitted and received.

SERIAL OP-CODE: After the device is selected with CS going low, the first byte will be

received. This byte contains the op-code that defines the operations to be performed.

INVALID OP-CODE: If an invalid op-code is received, no data will be shifted into the

AT25128A/256A, and the serial output pin (SO) will remain in a high impedance state

until the falling edge of CS is detected again. This will reinitialize the serial

communication.

CHIP SELECT: The AT25128A/256A is selected when the CS pin is low. When the

device is not selected, data will not be accepted via the SI pin, and the SO pin will

remain in a high impedance state.

HOLD: The HOLD pin is used in conjunction with the CS pin to select the

AT25128A/256A. When the device is selected and a serial sequence is underway,

HOLD can be used to pause the serial communication with the master device without

resetting the serial sequence. To pause, the HOLD pin must be brought low while the

SCK pin is low. To resume serial communication, the HOLD pin is brought high while the

SCK pin is low (SCK may still toggle during HOLD). Inputs to the SI pin will be ignored

while the SO pin is in the high impedance state.

WRITE PROTECT: The write protect pin (WP) will allow normal read/write operations

when held high. When the WP pin is brought low and WPEN bit is “1”, all write opera-

tions to the status register are inhibited. WP going low while CS is still low will interrupt a

write to the status register. If the internal write cycle has already been initiated, WP

going low will have no effect on any write operation to the status register. The WP pin

function is blocked when the WPEN bit in the status register is “0”. This will allow the

user to install the AT25128A/256A in a system with the WP pin tied to ground and still be

able to write to the status register. All WP pin functions are enabled when the WPEN bit

is set to “1”.

6AT25128A/256A

5088E–SEEPR–10/05

Figure 2. SPI Serial Interface

AT25128A/256A

5088E–SEEPR–10/05

Functional

Description

The AT25128A/256A is designed to interface directly with the synchronous serial

peripheral interface (SPI) of the 6800 type series of microcontrollers.

The AT25128A/256A utilizes an 8-bit instruction register. The list of instructions and

their operation codes are contained in Table 5. All instructions, addresses, and data are

transferred with the MSB first and start with a high-to-low CS transition.

WRITE ENABLE (WREN): The device will power-up in the write disable state when VCC

is applied. All programming instructions must therefore be preceded by a Write Enable

instruction.

WRITE DISABLE (WRDI): To protect the device against inadvertent writes, the Write

Disable instruction disables all programming modes. The WRDI instruction is indepen-

dent of the status of the WP pin.

READ STATUS REGISTER (RDSR): The Read Status Register instruction provides

access to the status register. The Ready/Busy and Write Enable status of the device

can be determined by the RDSR instruction. Similarly, the block write protection

bits indicate the extent of protection

employed. These bits are set by using the WRSR

instruction

WRITE STATUS REGISTER (WRSR): The WRSR instruction allows the user to select

one of four levels of protection. The AT25128A/256A is divided into four array segments.

Table 5. Instruction Set for the AT25128A/256A

Instruction Name Instruction Format Operation

WREN 0000 X110 Set Write Enable Latch

WRDI 0000 X100 Reset Write Enable Latch

RDSR 0000 X101 Read Status Register

WRSR 0000 X001 Write Status Register

READ 0000 X011 Read Data from Memory Array

WRITE 0000 X010 Write Data to Memory Array

Table 6. Status Register Format

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

WPEN X X X BP1 BP0 WEN RDY

Table 7. Read Status Register Bit Definition

Bit Definition

Bit 0 (RDY) Bit 0 = “0” (RDY) indicates the device is ready.

Bit 0 = “1” indicates the write cycle is in progress.

Bit 1 (WEN) Bit 1 = “0” indicates the device is not WRITE ENABLED. Bit 1 = “1”

indicates the device is write enabled.

Bit 2 (BP0) See Table 8.

Bit 3 (BP1) See Table 8.

Bits 4–6 are “0”s when device is not in an internal write cycle.

Bit 7 (WPEN) See Table 9.

Bits 0–7 are “1”s during an internal write cycle.

8AT25128A/256A

5088E–SEEPR–10/05

Top quarter, top half, or all of the memory segments can be protected. Any of the data

within any selected segment will therefore be read only. The block write protection levels

and corresponding status register control bits are shown in Table 8.

Bits BP0, BP1, and WPEN are nonvolatile cells that have the same properties and func-

tions as the regular memory cells (e.g., WREN, tWC, RDSR).

The WRSR instruction also allows the user to enable or disable the write protect (WP)

pin through the use of the write protect enable (WPEN) bit. Hardware write protection is

enabled when the WP pin is low and the WPEN bit is “1”. Hardware write protection is

disabled when either the WP pin is high or the WPEN bit is “0”. When the device is hard-

ware write protected, writes to the status register, including the block protect bits and the

WPEN bit, and the block-protected sections in the memory array are disabled. Writes

are only allowed to sections of the memory that are not block-protected.

NOTE: When the WPEN bit is hardware write protected, it cannot be changed back to

“0” as long as the WP pin is held low.

READ SEQUENCE (READ): Reading the AT25128A/256A via the SO pin requires the

following sequence. After the CS line is pulled low to select a device, the read op-code

is transmitted via the SI line followed by the byte address to be read (see Table 10).

Upon completion, any data on the SI line will be ignored. The data (D7–D0) at the spec-

ified address is then shifted out onto the SO line. If only one byte is to be read, the CS

line should be driven high after the data comes out. The read sequence can be contin-

ued since the byte address is automatically incremented and data will continue to be

shifted out. When the highest address is reached, the address counter will roll over to

the lowest address, allowing the entire memory to be read in one continuous read cycle.

WRITE SEQUENCE (WRITE): In order to program the AT25128A/256A, two separate

instructions must be executed. First, the device must be write enabled via the WREN

instruction. Then a Write instruction may be executed. Also, the address of the memory

location(s) to be programmed must be outside the protected address field location

Table 8. Block Write Protect Bits

Level

Status Register Bits Array Addresses Protected

BP1 BP0 AT25128A AT25256A

0 0 0 None None

1 (1/4) 0 1 3000–3FFF 6000–7FFF

2 (1/2) 1 0 2000–3FFF 4000–7FFF

3 (All) 1 1 0000–3FFF 0000–7FFF

Table 9. WPEN Operation

WPEN WP WEN

Protected

Blocks

Unprotected

Blocks

Status

0 X 0 Protected Protected Protected

0 X 1 Protected Writeable Writeable

1 Low 0 Protected Protected Protected

1 Low 1 Protected Writeable Protected

X High 0 Protected Protected Protected

X High 1 Protected Writeable Writeable

AT25128A/256A

5088E–SEEPR–10/05

selected by the block write protection level. During an internal write cycle, all commands

will be ignored except the RDSR instruction.

A Write instruction requires the following sequence. After the CS line is pulled low to

select the device, the WRITE op-code is transmitted via the SI line followed by the byte

address and the data (D7–D0) to be programmed (see Table 10). Programming will start

after the CS pin is brought high. The low-to-high transition of the CS pin must occur dur-

ing the SCK low time immediately after clocking in the D0 (LSB) data bit.

The Ready/Busy status of the device can be determined by initiating a Read Status

the write cycle has ended. Only the RDSR instruction is enabled during the write pro-

gramming cycle.

The AT25128A/256A is capable of a 64-byte page write operation. After each byte of

data is received, the six low-order address bits are internally incremented by one; the

high order bits of the address will remain constant. If more than 64 bytes of data are

transmitted, the address counter will roll over and the previously written data will be

overwritten. The AT25128A/256A is automatically returned to the write disable state at

the completion of a write cycle.

NOTE: If the device is not write enabled (WREN), the device will ignore the Write

instruction and will return to the standby state when CS is brought high. A new CS falling

edge is required to reinitiate the serial communication.

Table 10. Address Key

Address AT25128A AT25256A

ANA13 – A0A14 – A0

Don’t Care Bits A15 – A14 A15

10 AT25128A/256A

5088E–SEEPR–10/05

Timing Diagrams (for SPI Mode 0 [0, 0])

Figure 3. Synchronous Data Timing

Figure 4. WREN Timing

Figure 5. WRDI Timing

VOH

VOL

HI-Z HI-Z

VALID IN

VIH

VIL

tSU

tDIS

SCK

VIH

VIL

tWH

tCSH

VIH

VIL

tCSS

tCS

tWL

tHO

AT25128A/256A

5088E–SEEPR–10/05

Figure 6. RDSR Timing

Figure 7. WRSR Timing

SCK

01234567891011121314

SI INSTRUCTION

SO 76543210

DATA OUT

MSB

HIGH IMPEDANCE

12 AT25128A/256A

5088E–SEEPR–10/05

Figure 8. READ Timing

Figure 9. WRITE Timing

Figure 10. HOLD Timing

SCK

HOLD

tCD

tHD

tHZ

tLZ

tCD

tHD

AT25128A/256A

5088E–SEEPR–10/05

AT25128A Ordering Information

Ordering Code Package Operation Range

AT25128A-10PE-2.7

AT25128AN-10SE-2.7

AT25128A-10TE-2.7

8P3

8S1

8A2

Automotive Temperature

(−40°C to 125°C)

AT25128A-10PQ-2.7

AT25128AN-10SQ-2.7

AT25128A-10TQ-2.7

8P3

8S1

8A2

Lead-free/Halogen-free

Automotive Temperature

(−40°C to 125°C)

Package Type

8P3 8-lead, 0.300" Wide, Plastic Dual In-line Package (PDIP)

8S1 8-lead, 0.150" Wide, Plastic Gull Wing Small Outline Package (JEDEC SOIC)

8A2 8-lead, 0.170" Wide, Thin Shrink Small Outline Package (TSSOP)

Options

−2.7 Low-voltage (2.7V to 5.5V)

14 AT25128A/256A

5088E–SEEPR–10/05

AT25256A Ordering Information

Ordering Code Package Operation Range

AT25256A-10PE-2.7

AT25256AN-10SE-2.7

AT25256A-10TE-2.7

8P3

8S1

8A2

Automotive Temperature

(−40°C to 125°C)

AT25256A-10PQ-2.7

AT25256AN-10SQ-2.7

AT25256A-10TQ-2.7

8P3

8S1

8A2

Lead-free/Halogen-free

Automotive Temperature

(−40°C to 125°C)

Package Type

8P3 8-lead, 0.300" Wide, Plastic Dual In-line Package (PDIP)

8S1 8-lead, 0.150" Wide, Plastic Gull Wing Small Outline Package (JEDEC SOIC)

8A2 8-lead, 0.170" Wide, Thin Shrink Small Outline Package (TSSOP)

Options

−2.7 Low-voltage (2.7V to 5.5V)

AT25128A/256A

5088E–SEEPR–10/05

Packaging Information

8P3 – PDIP

2325 Orchard Parkway

San Jose, CA 95131

TITLE DRAWING NO.

REV.

8P3, 8-lead, 0.300" Wide Body, Plastic Dual

In-line Package (PDIP)

01/09/02

8P3B

Notes: 1. This drawing is for general information only; refer to JEDEC Drawing MS-001, Variation BA, for additional information.

2. Dimensions A and L are measured with the package seated in JEDEC seating plane Gauge GS-3.

3. D, D1 and E1 dimensions do not include mold Flash or protrusions. Mold Flash or protrusions shall not exceed 0.010 inch.

4. E and eA measured with the leads constrained to be perpendicular to datum.

5. Pointed or rounded lead tips are preferred to ease insertion.

6. b2 and b3 maximum dimensions do not include Dambar protrusions. Dambar protrusions shall not exceed 0.010 (0.25 mm).

COMMON DIMENSIONS

(Unit of Measure = inches)

SYMBOL MIN NOM MAX NOTE

A2 A

4 PLCS

–

0.210 2

A2 0.115 0.130 0.195

b 0.014 0.018 0.022 5

b2 0.045 0.060 0.070 6

b3 0.030 0.039 0.045 6

c 0.008 0.010 0.014

D 0.355 0.365 0.400 3

D1 0.005

–

E 0.300 0.310 0.325 4

E1 0.240 0.250 0.280 3

e 0.100 BSC

eA 0.300 BSC 4

L 0.115 0.130 0.150 2

Top View

Side View

End View

16 AT25128A/256A

5088E–SEEPR–10/05

8S1 – JEDEC SOIC

1150 E. Cheyenne Mtn. Blvd.

Colorado Springs, CO 80906

TITLE DRAWING NO.

REV.

Note:

10/7/03

8S1, 8-lead (0.150" Wide Body), Plastic Gull Wing

Small Outline (JEDEC SOIC) 8S1 B

COMMON DIMENSIONS

(Unit of Measure = mm)

SYMBOL MIN NOM MAX NOTE

A1 0.10 – 0.25

These drawings are for general information only. Refer to JEDEC Drawing MS-012, Variation AA for proper dimensions, tolerances, datums, etc.

A 1.35 – 1.75

b 0.31 – 0.51

C 0.17 – 0.25

D 4.80 – 5.00

E1 3.81 – 3.99

E 5.79 – 6.20

e 1.27 BSC

L 0.40 – 1.27

∅ 0˚ – 8˚

∅

Top View

End View

Side View

AT25128A/256A

5088E–SEEPR–10/05

8A2 – TSSOP

2325 Orchard Parkway

San Jose, CA 95131

TITLE DRAWING NO.

REV.

5/30/02

COMMON DIMENSIONS

(Unit of Measure = mm)

SYMBOL MIN NOM MAX NOTE

D 2.90 3.00 3.10 2, 5

E 6.40 BSC

E1 4.30 4.40 4.50 3, 5

A – – 1.20

A2 0.80 1.00 1.05

b 0.19 – 0.30 4

e 0.65 BSC

L 0.45 0.60 0.75

L1 1.00 REF

8A2, 8-lead, 4.4 mm Body, Plastic

Thin Shrink Small Outline Package (TSSOP)

Notes: 1. This drawing is for general information only. Refer to JEDEC Drawing MO-153, Variation AA, for proper dimensions, tolerances,

datums, etc.

2. Dimension D does not include mold Flash, protrusions or gate burrs. Mold Flash, protrusions and gate burrs shall not exceed

0.15 mm (0.006 in) per side.

3. Dimension E1 does not include inter-lead Flash or protrusions. Inter-lead Flash and protrusions shall not exceed 0.25 mm

(0.010 in) per side.

4. Dimension b does not include Dambar protrusion. Allowable Dambar protrusion shall be 0.08 mm total in excess of the

b dimension at maximum material condition. Dambar cannot be located on the lower radius of the foot. Minimum space between

protrusion and adjacent lead is 0.07 mm.

5. Dimension D and E1 to be determined at Datum Plane H.

8A2 B

Side View

End View

Top View

123

Pin 1 indicator

this corner

Printed on recycled paper.

5088E–SEEPR–10/05

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