ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 1 -
AK93C45A / 55A / 65A / 75A
1K / 2K / 4K / 8Kbit Serial CMOS EEPROM
Features
ADVANCED CMOS EEPROM TECHNOLOGY
READ/WRITE NON-VOLATILE MEMORY
WIDE VCC OPERATION Vcc = 1.8V 5.5V
AK93C45A
1024 bits, 64 16 organization
AK93C55A
2048 bits, 128 16 organizatio n
AK93C65A
4096 bits, 256 16 organizatio n
AK93C75A
8192 bits, 512 16 organizatio n
SERIAL INTERFACE
- Interfaces with popular microcontrollers and standard microprocessors
LOW POWER CONSUMPTION
- 0.5mA max. Read Operation
- 0.8A Max. Standby
HIGH RELIABILITY
-Endurance : 100K cycles
-Data Retention : 10 years
Au tomatic address increment (READ)
Au tomatic write cycle time-out with auto-ERASE
Busy/Ready status signal
Software controlled write protection
IDEAL FOR LOW DENSITY DATA STORAGE
- Low cost, space saving, 8-pin package
Block Diagram
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 2 -
General Description
The AK93C45A/55A/65A/75A is a 1024/2048/4096/8192-bit serial CMOS EEPROM divided into
64/128/256/512 registers of 16 bits each.
The AK93C45A/55A/65A/75A has 4 instructions such as READ, WRITE, EWEN and EWDS. Those
instructions control the AK93C45A/55A/65A/75A.
The AK93C45A/55A/65A/75A can operate full function under wide operating voltage range from 1.8V to 5.5V.
The charge up circuit is integrated for high voltage generation that is used for write operation.
A serial interface of AK93C45A/55A/65A/75A, consisting of chip select (CS), serial clock (SK), data-in (DI)
and data-out (DO), can easily be controlled by popular microcontrollers or standard microprocessors.
AK93C45A/55A/65A/75A takes in the write data from data input pin (DI) to a register synchronously with rising
edge of input pulse of serial clock pin (SK). And at read operation, AK93C45A/55A/65A/75A takes out the
read data from a register to data output pin (DO) synchronously with rising edge of SK.
The DO pi n i s u suall y in hig h impedan ce stat e. The DO pi n out pu t s "L" o r "H " i n case o f data ou tpu t o r Busy/R ead y
signal outp ut .
Software and Hardware controlled write protection
When Vcc is applied to the part, the part automatically powers up in the ERASE/WRITE Disable state. In the
ERASE/W RITE disa ble state, execution of WRIT E ins tr uc ti on is disa bled. Before WR ITE ins truction is
executed, EWEN instruction must be executed. The ERASE/WRITE enable state continues until EWDS
instruction is executed or Vcc is removed from the part.
Execution of a read instruction is independent of both EWEN and EWDS instructions.
The PE is internally pulled up to VCC. If the PE is left unconnected, the part will accept WRITE, EWEN and
EWDS instruct ions.
AK93C55A/65A
Busy/Ready status signal
After a write instruction, the DO output serves as a Busy/Ready status indicator. After the falling edge of the
CS initiates the self-timed programming cycle, the DO indicates the Busy/Ready status of the chip if the CS is
brought high after a minimum of 250ns (Tcs). DO=logical "0" indicates that programming is still in progress.
DO=logical "1" indicates that the register at the address specified in the instruction has been written with the
new data pattern contained in the instruction and the part is ready for a next instruction.
The Busy/Ready status indicator is only valid when CS is active (high). When CS is low, the DO output goes
into a high impedance state.
The Busy/Ready signal outputs until a start bit (Logic"1") of the next instruction is given to the part.
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 3 -
Type of Products
Model Memory size Temp.Range Vcc Package
AK93C45AF
AK93C45ANF
AK93C45AV 1Kbits -40
C
85
C
-40
C
85
C
-40
C
85
C
1.8V
5.5V
1.8V
5.5V
1.8V
5.5V
8pin Plastic SO P
8pin Plastic SO P
8pin Plastic TSSOP
AK93C55AF
AK93C55ANF
AK93C55AV 2Kbits -40
C
85
C
-40
C
85
C
-40
C
85
C
1.8V
5.5V
1.8V
5.5V
1.8V
5.5V
8pin Plastic SO P
8pin Plastic SO P
8pin Plastic TSSOP
AK93C65AF
AK93C65ANF
AK93C65AV 4Kbits -40
C
85
C
-40
C
85
C
-40
C
85
C
1.8V
5.5V
1.8V
5.5V
1.8V
5.5V
8pin Plastic SO P
8pin Plastic SO P
8pin Plastic TSSOP
AK93C75AF
AK93C75ANF
AK93C75AV 8Kbits -40
C
85
C
-40
C
85
C
-40
C
85
C
1.8V
5.5V
1.8V
5.5V
1.8V
5.5V
8pin Plastic SO P
8pin Plastic SO P
8pin Plastic TSSOP
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 4 -
Pin arrangement
Pin Name Function
CS Chip Select
SK Serial Data Clock
DI Serial Data Input
DO Serial Data Output
GND Ground
PE Program Enable
Vcc Power Supply
NC Not Connected
(note) The PE is internally pulled up to VCC ( R = typ.2.5M
, VCC=5V ).
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 5 -
Functional Description
The AK93C45A/55A/65A/75A has 4 instructions such as READ, WRITE, EWEN and EWDS. A valid
instruction consists of a Start Bit (Logic"1"), the appropriate Op Code and the desired memory Address
location.
The CS pin must be brought low for a minimum of 250ns (Tcs) between each instruction when the instruction
is continuously executed.
Instruction Start
Bit Op
Code Address Data Comments
READ 1 10 A5-A0 D15-D0 Reads data stored in memory, at specified address.
WRITE 1 01 A5-A0 D15-D0 Writes register.
EWEN 1 00 11XXXX Write enable must precede all programming modes.
EWDS 1 00 00XXXX Disables all programming instructions.
WRAL 1 00 01XXXX D15-D0 Writes all registers. X: Don't care
table 1. Instruction Set for the AK93C45A
Instruction Start
Bit Op
Code Address Data Comments
READ 1 10 X A6-A0 D15-D0 Reads data stored in memory, at specified address.
WRITE 1 01 X A6-A0 D15-D0 Writes register.
EWEN 1 00 11XXXXXX Write enable must precede all programming modes.
EWDS 1 00 00XXXXXX Disables all programming instructions.
WRAL 1 00 01XXXXXX D15-D0 Writes all registers. X: Don't care
table 2. Instruction Set for the AK93C55A
Instruction Start
Bit Op
Code Address Data Comments
READ 1 10 A7-A0 D15-D0 Reads data stored in memory, at specified address.
WRITE 1 01 A7-A0 D15-D0 Writes register.
EWEN 1 00 11XXXXXX Write enable must precede all programming modes.
EWDS 1 00 00XXXXXX Disables all programming instructions.
WRAL 1 00 01XXXXXX D15-D0 Writes all registers. X: Don't care
table 3. Instruction Set for the AK93C65A
Instruction Start
Bit Op
Code Address Data Comments
READ 1 10 XA8-A0 D15-D0 Reads data stored in memory, at specified address.
WRITE 1 01 XA8-A0 D15-D0 Writes register.
EWEN 1 00 11XXXXXXXX Write enable must precede all programming modes.
EWDS 1 00 00XXXXXXXX Disables all programming instructions.
WRAL 1 00 01XXXXXXXX D15-D0 Writes all registers. X: Don't care
table 4. Instruction Set for the AK93C75A
(Note)
The WRAL instruction are used for factory function test only.
User can't use the WRAL instruction.
The AK93C45A/55A/65A/75A perceives the start bit in the logic"1" and also "01".
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 6 -
Write
The write instruction is followed by 16 bits of data to be written into the specified address. After the last bit of
data is put on the DI pin, the CS pin must be brought low before the next rising edge of the SK clock. This
falling edge of the CS initiates the self-timed programming cycle. The DO indicates the Busy/Ready status of
the chip if the CS is brought high after a minimum of 250ns (Tcs). DO=logical "0" indicates that programming
is still in progress. DO=logical "1" indicates that the register at the address specified in the instruction has
been written with the new data pattern contained in the instruction and the part is ready for a next instruction.
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 7 -
Read
The read instruction is the only instruction which outputs serial data on the DO pin.
Following the Start bit, first Op code and address are decoded, then the data from the selected memory
location is available at the DO pin. A dummy bit (logical "0") precedes the 16-bit data from the selected
memory location. The output data changes are synchronized with the rising edges of the serial clock (SK).
The data in the next address can be read sequentially by continuing to provide clock. The address
automatically cycles to the next higher address after the 16bit data shifted out.
When the highest address is reached, the address counter rolls over to address $00 or $000 allowing the read
cycle to be continued indefinitely.
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 8 -
EWEN / EWDS
When Vcc is applied to the part, the part automatically powers up in the ERASE/WRITE Disable state. In the
ERASE/WRITE disable state, execution of WRITE instruction is disable. Before WRITE instruction is
executed, EWEN instruction must be executed. The ERASE/WRITE enable state continues until EWDS
instruction is executed or Vcc is removed from the part.
Execution of a read instruction is independent of both EWEN and EWDS instructions.
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 9 -
Absolute Maximum Ratings
Parameter Symbol Min Max Unit
Power Supply VCC -0.6 +7.0 V
All Input Voltages
with Respect to Ground VIO -0.6 VCC+0.6 V
Ambient storage temperature Tst -65 +150
C
Stress above those listed under "Absolute Maximum 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 conditions above those indicated in the operational sections of the
specification is not implied. Exposure to absolute maximum conditions for extended
periods ma y affect device reliability.
Recommended Operating Condition
Parameter Symbol Min Max Unit
Pow er Supply VCC 1.8 5.5 V
Ambient Operating Temperature Ta -40 +85
C
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 10 -
Electrical Characteristics
(1) D.C. ELECTRICAL CHARACTERISTICS
AK93C45A/55A/65A ( 1.8V
Vcc
5.5V, -40
C
Ta
85
C, unless otherwise specified )
Parameter Symbol Condition Min. Max. Unit
ICC1 VCC=5.5V, tSKP=1us, *1 4.0 mA
93C45A 1.5 mA
Current Dissipation
(WRITE) ICC2 VCC=1.8V,
tSK=4us,*1 93C55A/65A 2.0 mA
ICC3 VCC=5.5V, tSKP=1us, *1 0.5 mA
ICC4 VCC=2.5V, tSKP=2us, *1 0.2 mA
Current Dissipation
(READ,EWEN,EWDS) ICC5 VCC=1.8V, tSKP=4us, *1 0.1 mA
Current Dissipation
(Standby) ICCSB VCC=5.5V *2 0.8 uA
VIH1 VCC=5V
10% 2.0 VCC+0.5 V
VIH2 2.5V
VCC
5.5V 0.8
VCC VCC+0.5 V
Input High Voltage
VIH3 1.8V
VCC<2.5V 0.8
VCC VCC+0.5 V
VIL1 VCC=5V
10% -0.1 0.8 V
VIL2 2.5V
VCC
5.5V -0.1 0.15
VCC V
Input Low Voltage
VIL3 1.8V
VCC<2.5V -0.1 0.2
VCC V
VOH1 VCC=5V
10%
IOH=-0.4mA 2.2 V
VOH2 2.5V
VCC
5.5V
IOH=-0.1mA 0.8
VCC V
Output High Voltage
VOH3 1.8V
VCC<2.5V
IOH=-0.1mA 0.8
VCC V
VOL1 VCC=5V
10%
IOL=2.1mA 0.4 V
VOL2 2.5V
VCC
5.5V
IOL=1.0mA 0.4 V
Output Low Voltage
VOL3 1.8V
VCC<2.5V
IOL=0.1mA 0.4 V
Input Leakage ILI VCC=5.5V,VIN=5.5V *3
1.0 uA
Output Leaka ge ILO VCC=5.5V
VOUT=5.5V,CS=GND
1.0 uA
*1:VIN=VIH/VIL,DO=Open
*2:VIN=VCC/GND,CS=GND,DO=Open
*3:CS, SK, DI pin
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 11 -
AK93C75A ( 1.8V
Vcc
5.5V, -40
C
Ta
85
C, unless otherwise specified )
Parameter Symbol Condition Min. Max. Unit
ICC1 VCC=5.5V, tSKP=1us, *4 4.0 mACurrent Dissipation
(WRITE) ICC2 VCC=1.8V, tSKP=4us, *4 2.0 mA
ICC3 VCC=5.5V, tSKP=1us, *4 0.4 mACurrent Dissipation
(READ,EWEN,EWDS) ICC4 VCC=1.8V, tSKP=4us, *4 0.1 mA
Current Dissipation
(Standby) ICCSB VCC=5.5V *5 0.8 uA
Input High Voltage VIH 0.8
VCC VCC+0.5 V
Input Low Voltage VIL -0.1 0.2
VCC V
VOH1 2.5V
VCC
5.5V
IOH=-0.1mA 0.8
VCC VOutput High Voltage
VOH2 1.8V
VCC<2.5V
IOH=-0.1mA 0.8
VCC V
VOL1 2.5V
VCC
5.5V
IOL=1.0mA 0.4 VOutput Low Volta ge
VOL2 1.8V
VCC<2.5V
IOL=0.1mA 0.4 V
Input Leakage ILI VCC=5.5V, VIN=5.5V *6
1.0 uA
Output Leaka ge ILO VCC=5.5V
VOUT=5.5V, CS=GND
1.0 uA
*4:VIN=VIH/VIL,DO=Open
*5:VIN=VCC/GND,CS=GND,DO=Open
*6:CS, SK, DI pin
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 12 -
(2) A.C. ELECTRICAL CHARACTERISTICS ( 1.8V
Vcc
5.5V, -40
C
Ta
85
C, unless otherwise specified )
Parameter Symbol Condition Min. Max. Unit
tSKP1 4.5V
VCC
5.5V 1.0 us
tSKP2 2.0V
VCC<4.5V 2.0 us
SK Cycle Time
tSKP3 1.8V
VCC<2.0V 4.0 us
tSKW1 4.5V
VCC
5.5V 500 ns
tSKW2 2.0V
VCC<4.5V 1.0 us
SK Pulse Width
tSKW3 1.8V
VCC<2.0V 2.0 us
CS Setup Time tCSS 100 ns
CS Hold Time tCSH 0 ns
Data Setup Time tDIS 200 ns
Data Hold Time tDIH 200 ns
tPD1 4.5V
VCC
5.5V 500 ns
tPD2 2.0V
VCC<4.5V 1.0 us
Output delay *7 tPD3 1.8V
VCC<2.0V 2.0 us
tE/W1 93C45A/55A/65A 10 ms
tE/W2 4.5V
VCC
5.5V 8 ms
Selftimed Programming
Time tE/W3 93C75A 1.8V
VCC<4.5V 10 ms
Min CS Low T ime tCS 250 ns
CS to Status Valid tSV CL=100pF 500 ns
tOZ1 2.0V
VCC
5.5V 100 nsCS to Output High-Z tOZ2 1.8V
VCC<2.0V 250 ns
*7:CL=100pF
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 13 -
Synchronous Data Timing
The Start of Instruction
The End of Instruction
ASAHI KAS EI [AK93C45A /55 A/65A/75A]
DAM01E-01 1999/10
- 14 -
Busy/Ready Signal Output
IMPORTANT NOTICE
zThese products and their specifications are subject to change without notice. Before
considering any use or application, consult the Asahi Kas ei Microsystems Co., Ltd. (AKM)
sales office or authorized distributor concerning their current status.
zAKM assumes no liability for infringement of any patent, intellectual property, or other
right in the application or use of any information contained herein.
zAny export of these products, or devices or systems containing them, may require an
export license or other official approval under the law and regulations of the country of
export pertaining to customs and tariffs, currency exchange, or strategic materials.
zAKM products are neither intended nor authorized for use as critical components in any
safety, life support, or other hazard related device or system, and AKM assumes no
responsibility relating to any such use, except with the express written consent of the
Representative Director of AKM. As used here:
(a) A hazard related device or system is one designed or intended for life support or
maintenance of safety or for applications in medicine, aerospace, nuclear energy, or
other fields, in which its failure to funct ion or perform may reasonably be expected to
result in loss of life or in significant injury or damage to person or property.
(b) A critical component is one whose failure to function or perform may reasonably be
expected to result, whether directly or indirectly, in the loss of the safety or
effectiveness of the device or system containing it, and which must therefore meet
very high standards of performance and reliability.
zIt is the responsibility of the buyer or distributor of an AKM product who distributes,
disposes of, or otherwise places the product with a third party to notify that party in
advance of the above content and conditions, and the buyer or distributor agrees to
assume any and all responsibility and liability for and hold AKM harmless from any and
all claims arising from the use of said product in the absence of such notification.
