AK93C45B Datasheet, PDF (4/14 Pages) Asahi Kasei Microsystems – 1K / 2K / 4K / 8KBIT SERIAL CMOS EEPROM

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
Data
Comments
A5-A0
D15-D0 Reads data stored in memory, at specified address.
A5-A0
D15-D0 Writes register.
11XXXX
Write enable must precede all programming modes.
00XXXX
Disables all programming instructions.
01XXXX
D15-D0 Writes all registers.
table 1. Instruction Set for the AK93C45B
X: Don't care
Instruction
READ
WRITE
EWEN
EWDS
WRAL
Start
Bit
1
1
1
1
1
Op
Code
10
01
00
00
00
Address
Data
Comments
X A6-A0
D15-D0 Reads data stored in memory, at specified address.
X A6-A0
D15-D0 Writes register.
11XXXXXX
Write enable must precede all programming modes.
00XXXXXX
Disables all programming instructions.
01XXXXXX D15-D0 Writes all registers.
table 2. Instruction Set for the AK93C55B
X: Don't care
Instruction
READ
WRITE
EWEN
EWDS
WRAL
Start
Bit
1
1
1
1
1
Op
Code
10
01
00
00
00
Address
Data
Comments
A7-A0
D15-D0 Reads data stored in memory, at specified address.
A7-A0
D15-D0 Writes register.
11XXXXXX
Write enable must precede all programming modes.
00XXXXXX
Disables all programming instructions.
01XXXXXX D15-D0 Writes all registers.
table 3. Instruction Set for the AK93C65B
X: Don't care
Instruction
READ
WRITE
EWEN
EWDS
WRAL
Start
Bit
1
1
1
1
1
Op
Code
10
01
00
00
00
Address
Data
Comments
XA8-A0
D15-D0 Reads data stored in memory, at specified address.
XA8-A0
D15-D0 Writes register.
11XXXXXXXX
Write enable must precede all programming modes.
00XXXXXXXX
Disables all programming instructions.
01XXXXXXXX D15-D0 Writes all registers.
table 4. Instruction Set for the AK93C75B
X: Don't care
(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