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ASAHI KASEI

[AK93C45A/55A/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 organization

AK93C65A 



  



  



 

4096 bits, 256 



 16 organization

AK93C75A 



  



  



 

8192 bits, 512 



 16 organization



SERIAL INTERFACE

- Interfaces with popular microcontrollers and standard microprocessors



LOW POWER CONSUMPTION

- 0.5mA max.  Read Operation

- 0.8



A 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

Block Diagram

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ASAHI KASEI

[AK93C45A/55A/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 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.

 



  



 

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.

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ASAHI KASEI

[AK93C45A/55A/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 SOP

8pin Plastic SOP

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 SOP

8pin Plastic SOP

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 SOP

8pin Plastic SOP

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 SOP

8pin Plastic SOP

8pin Plastic TSSOP

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ASAHI KASEI

[AK93C45A/55A/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 ).

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ASAHI KASEI

[AK93C45A/55A/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".

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ASAHI KASEI

[AK93C45A/55A/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.

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ASAHI KASEI

[AK93C45A/55A/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.

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ASAHI KASEI

[AK93C45A/55A/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.

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ASAHI KASEI

[AK93C45A/55A/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 may affect device reliability.

Recommended Operating Condition

Parameter

Symbol

Min

Max

Unit

 Power Supply

VCC

1.8

5.5

V

 Ambient Operating Temperature

Ta

-40

+85



C

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ASAHI KASEI

[AK93C45A/55A/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)

ICC

SB

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 Leakage

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

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ASAHI KASEI

[AK93C45A/55A/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

mA

Current Dissipation

(WRITE) ICC2

VCC=1.8V, tSKP=4us,  *4

2.0

mA

ICC3

VCC=5.5V, tSKP=1us,  *4

0.4

mA

Current Dissipation

(READ,EWEN,EWDS)

ICC4

VCC=1.8V, tSKP=4us,  *4

0.1

mA

Current Dissipation

(Standby)

ICC

SB

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

V

Output 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

V

Output Low Voltage

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 Leakage

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

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ASAHI KASEI

[AK93C45A/55A/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 Time

tCS

250

ns

CS to Status Valid

tSV

CL=100pF

500

ns

tOZ1

2.0V



VCC



5.5V

100

ns

CS to Output High-Z

tOZ2

1.8V



VCC<2.0V

250

ns

*7:CL=100pF

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ASAHI KASEI

[AK93C45A/55A/65A/75A]

DAM01E-01

1999/10

- 13 -

Synchronous Data Timing

The Start of Instruction

The End of Instruction

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ASAHI KASEI

[AK93C45A/55A/65A/75A]

DAM01E-01

1999/10

- 14 -

Busy/Ready Signal Output

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IMPORTANT NOTICE

z

These 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.

z

AKM assumes no liability for infringement of any patent, intellectual property, or other

right in the application or use of any information contained herein.

z

Any 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.

z

AKM 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.

z

It 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.