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ASAHI KASEI
[AK93C45B/55B/65B/75B]
AK93C45B / 55B / 65B / 75B
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 AK93C45B 1024 bits, 64 16 organization AK93C55B 2048 bits, 128 16 organization 4096 bits, 256 16 organization AK93C65B AK93C75B 8192 bits, 512 16 organization SERIAL INTERFACE - Interfaces with popular microcontrollers and standard microprocessors LOW POWER CONSUMPTION - 0.8A Max. Standby HIGH RELIABILITY -Endurance : 100K cycles -Data Retention : 10 years Automatic address increment (READ) Automatic 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 (MSOP)

Block Diagram
DAM04E-01 -11999/10
ASAHI KASEI
[AK93C45B/55B/65B/75B]
General Description The AK93C45B/55B/65B/75B is a 1024/2048/4096/8192-bit serial CMOS EEPROM divided into 64/128/256/512 registers of 16 bits each. The AK93C45B/55B/65B/75B has 4 instructions such as READ, WRITE, EWEN and EWDS. Those instructions control the AK93C45B/55B/65B/75B. The AK93C45B/55B/65B/75B 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 AK93C45B/55B/65B/75B, 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. AK93C45B/55B/65B/75B 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, AK93C45B/55B/65B/75B takes out the read data from a register to data output pin (DO) synchronously with rising edge of SK. The DO pin is usually in high impedance state. The DO pin outputs "L" or "H" in case of data output or Busy/Ready signal output.
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/WRITE disable state, execution of WRITE instruction is disabled. 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. The PE is internally pulled up to VCC. If the PE is left unconnected, the part will accept WRITE, EWEN and EWDS instructions. AK93C55B/65B/75B 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.
Type of Products
Model AK93C45BH AK93C55BH AK93C65BH AK93C75BH Memory size 1Kbits 2Kbits 4Kbits 8Kbits Temp.Range -40C85C -40C85C -40C85C -40C85C Vcc 1.8V 5.5V 1.8V 5.5V 1.8V 5.5V 1.8V 5.5V Package 8pin Plastic MSOP 8pin Plastic MSOP 8pin Plastic MSOP 8pin Plastic MSOP
DAM04E-01 -2-
1999/10
ASAHI KASEI
[AK93C45B/55B/65B/75B]
Pin arrangement
Pin Name CS SK DI DO PE GND Vcc NC
Function Chip Select Serial Data Clock Serial Data Input Serial Data Output Program Enable Ground Power Supply Not Connected
(Note) The PE is internally pulled up to VCC ( R = typ.2.5M, VCC=5V ).
DAM04E-01 -3-
1999/10
ASAHI KASEI
[AK93C45B/55B/65B/75B]
Functional Description The AK93C45B/55B/65B/75B 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 READ WRITE EWEN EWDS WRAL Start Bit 1 1 1 1 1 Op Code 10 01 00 00 00 Address A5-A0 A5-A0 11XXXX 00XXXX 01XXXX Data D15-D0 D15-D0 Comments
Reads data stored in memory, at specified address. Writes register. Write enable must precede all programming modes. Disables all programming instructions. D15-D0 Writes all registers. X: Don't care table 1. Instruction Set for the AK93C45B Address Data D15-D0 D15-D0 Comments
Instruction READ WRITE EWEN EWDS WRAL
Start Bit 1 1 1 1 1
Op Code 10 01 00 00 00
X A6-A0 X A6-A0 11XXXXXX 00XXXXXX 01XXXXXX
Reads data stored in memory, at specified address. Writes register. Write enable must precede all programming modes. Disables all programming instructions. D15-D0 Writes all registers. X: Don't care table 2. Instruction Set for the AK93C55B Address Data D15-D0 D15-D0 Comments
Instruction READ WRITE EWEN EWDS WRAL
Start Bit 1 1 1 1 1
Op Code 10 01 00 00 00
A7-A0 A7-A0 11XXXXXX 00XXXXXX 01XXXXXX
Reads data stored in memory, at specified address. Writes register. Write enable must precede all programming modes. Disables all programming instructions. D15-D0 Writes all registers. X: Don't care table 3. Instruction Set for the AK93C65B Address Data Comments
Instruction READ WRITE EWEN EWDS WRAL
Start Bit 1 1 1 1 1
Op Code 10 01 00 00 00
XA8-A0 D15-D0 XA8-A0 D15-D0 11XXXXXXXX 00XXXXXXXX 01XXXXXXXX D15-D0
Reads data stored in memory, at specified address. Writes register. Write enable must precede all programming modes. Disables all programming instructions. Writes all registers. X: Don't care table 4. Instruction Set for the AK93C75B
(Note)
The WRAL instruction are used for factory function test only. User can't use the WRAL instruction. The AK93C45B/55B/65B/75B perceives the start bit in the logic"1" and also "01".
DAM04E-01 -4-
1999/10
ASAHI KASEI
[AK93C45B/55B/65B/75B]
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.
WRITE (AK93C45B)
*Address bit A7 becomes a "don't care" for AK93C55B. WRITE (AK93C55B/65B)
WRITE (AK93C75B)
DAM04E-01 -5-
1999/10
ASAHI KASEI
[AK93C45B/55B/65B/75B]
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.
READ (AK93C45B)
*Address bit A7 becomes a "don't care" for AK93C55B. READ (AK93C55B/65B)
READ (AK93C75B)
DAM04E-01 -6-
1999/10
ASAHI KASEI
[AK93C45B/55B/65B/75B]
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.
EWEN/EWDS (AK93C45B)
EWEN/EWDS (AK93C55B/65B)
EWEN/EWDS (AK93C75B)
DAM04E-01 -7-
1999/10
ASAHI KASEI
[AK93C45B/55B/65B/75B]
Absolute Maximum Ratings
Parameter Power Supply All Input Voltages with Respect to Ground Ambient storage temperature
Symbol VCC VIO Tst
Min -0.6 -0.6 -65
Max +7.0 VCC+0.6 +150
Unit V V
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 may affect device reliability.
Recommended Operating Condition
Parameter Power Supply Ambient Operating Temperature
Symbol VCC Ta
Min 1.8 -40
Max 5.5 +85
Unit V
C
DAM04E-01 -8-
1999/10
ASAHI KASEI
[AK93C45B/55B/65B/75B]
Electrical Characteristics (1) D.C. ELECTRICAL CHARACTERISTICS
AK93C45B/55B/65B
( 1.8VVcc5.5V, -40CTa85C, unless otherwise specified )
Parameter Current Dissipation
(WRITE)
Symbol ICC1 ICC2
Condition VCC=5.5V, tSKP=1us, *1 VCC=1.8V, 93C45B tSK=4us,*1 93C55B/65B VCC=5.5V, tSKP=1us, *1 VCC=2.5V, tSKP=2us, *1 VCC=1.8V, tSKP=4us, *1 VCC=5.5V VCC=5V10% 2.5VVCC5.5V 1.8VVCC<2.5V VCC=5V10% 2.5VVCC5.5V 1.8VVCC<2.5V VCC=5V10% IOH=-0.4mA 2.5VVCC5.5V IOH=-0.1mA 1.8VVCC<2.5V IOH=-0.1mA VCC=5V10% IOL=1.5mA 2.5VVCC5.5V IOL=1.0mA 1.8VVCC<2.5V IOL=0.1mA VCC=5.5V,VIN=5.5V *3 VCC=5.5V VOUT=5.5V,CS=GND *2
Min.
Max. 4.0 1.5 2.0 0.5 0.2 0.1 0.8
Unit mA mA mA mA mA mA uA V V V V V V V V V
Current Dissipation
ICC3 ICC4
(READ,EWEN,EWDS)
ICC5 ICCSB VIH1 VIH2 VIH3
Current Dissipation (Standby) Input High Voltage
2.0 0.8 VCC 0.8 VCC -0.1 -0.1 -0.1 2.2 0.8 VCC 0.8 VCC
VCC+0.5 VCC+0.5 VCC+0.5 0.8 0.15 VCC 0.2 VCC
Input Low Voltage
VIL1 VIL2 VIL3
Output High Voltage
VOH1 VOH2 VOH3
Output Low Voltage
VOL1 VOL2 VOL3
0.4 0.4 0.4
V V V uA uA
Input Leakage Output Leakage
ILI ILO
1.0 1.0
*1: VIN=VIH/VIL,DO=Open *2: VIN=VCC/GND,CS=GND,DO=Open *3: CS, SK, DI pin
DAM04E-01 -9-
1999/10
ASAHI KASEI
[AK93C45B/55B/65B/75B]
AK93C75B
( 1.8VVcc5.5V, -40CTa85C, unless otherwise specified )
Parameter Current Dissipation
(WRITE)
Symbol ICC1 ICC2 ICC3 ICC4 ICCSB VIH VIL VOH1 VOH2
Condition VCC=5.5V, tSKP=1us, *4 VCC=1.8V, tSKP=4us, *4 VCC=5.5V, tSKP=1us, *4 VCC=1.8V, tSKP=4us, *4 VCC=5.5V *5
Min.
Max. 4.0 2.0 0.4 0.1 0.8
Unit mA mA mA mA uA V V V V
Current Dissipation
(READ,EWEN,EWDS)
Current Dissipation (Standby) Input High Voltage Input Low Voltage Output High Voltage
0.8 VCC -0.1 2.5VVCC5.5V IOH=-0.1mA 1.8VVCC<2.5V IOH=-0.1mA 2.5VVCC5.5V IOL=1.0mA 1.8VVCC<2.5V IOL=0.1mA VCC=5.5V,VIN=5.5V *6 VCC=5.5V VOUT=5.5V,CS=GND 0.8 VCC 0.8 VCC
VCC+0.5 0.2 VCC
Output Low Voltage
VOL1 VOL2
0.4 0.4
V V
Input Leakage Output Leakage
ILI ILO
1.0 1.0
uA uA
*4: VIN=VIH/VIL,DO=Open *5: VIN=VCC/GND,CS=GND,DO=Open *6: CS, SK, DI pin
DAM04E-01 - 10 -
1999/10
ASAHI KASEI (2) A.C. ELECTRICAL CHARACTERISTICS
[AK93C45B/55B/65B/75B]
( 1.8VVcc5.5V, -40CTa85C, unless otherwise specified )
Parameter SK Cycle Time
Symbol tSKP1 tSKP2 tSKP3
Condition 4.5VVCC5.5V 2.0VVCC<4.5V 1.8VVCC<2.0V 4.5VVCC5.5V 2.0VVCC<4.5V 1.8VVCC<2.0V
Min. 1.0 2.0 4.0 500 1.0 2.0 100 0 200 200
Max.
Unit us us us ns us us ns ns ns ns
SK Pulse Width
tSKW1 tSKW2 tSKW3
CS Setup Time CS Hold Time Data Setup Time Data Hold Time
tCSS tCSH tDIS tDIH tPD1 4.5VVCC5.5V 2.0VVCC<4.5V 1.8VVCC<2.0V 93C45B/55B/65B 93C75B 4.5VVCC5.5V 1.8VVCC<4.5V
500 1.0 2.0 10 8 10 250
ns us us ms ms ms ns
Output delay *7
tPD2 tPD3
Selftimed Programming Time
tE/W1 tE/W2 tE/W3
Min CS Low Time CS to Status Valid CS to Output High-Z
*7: CL=100pF
tCS tSV tOZ1 tOZ2 CL=100pF 2.0VVCC5.5V 1.8VVCC<2.0V
500 100 250
ns ns ns
DAM04E-01 - 11 -
1999/10
ASAHI KASEI
[AK93C45B/55B/65B/75B]
Synchronous Data Timing
The Start of Instruction
The End of Instruction
DAM04E-01 - 12 -
1999/10
ASAHI KASEI
[AK93C45B/55B/65B/75B]
Busy/Ready Signal Output
DAM04E-01 - 13 -
1999/10
IMPORTANT NOTICE
zThese products and their specifications are subject to change without notice. Before considering any use or application, consult the Asahi Kasei 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 function 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.

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