AK6420A Datasheet, PDF (5/15 Pages) Asahi Kasei Microsystems – 2K / 4K / 8Kbit Serial CMOS EEPROM

ASAHI KASEI
[AK6420B/40B/80B]
Functional Description
The AK6420B/40B/80B has 4 instructions such as READ, WRITE, WREN (write enable) and WRDS (write
disable). Each instruction is organized by op-code block (8bits), address block (8bits) and data (8bitsÕ2).
When input level of SK pin is high level and input level of chip select (CS) pin is changed from high level to low
level, AK6420B/40B/80B can receive the instructions.
When the instructions are executed consecutively, the CS pin should be brought to high level for a minimum of
250ns(Tcs) between consecutive instruction cycle.
„ Instruction Set For 6420B
Instruction
READ
WRITE
WREN
WRDS
( WRAL )
Op-Code
10101000
10100100
10100011
10100000
10101111
Address
A6 A5 A4 A3 A2 A1 A0 0
A6 A5 A4 A3 A2 A1 A0 0
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ÕýýÕýýÕýýÕýýÕýýÕýýÕýýÕ
Data
D15 -D0
D15 -D0
D15 -D0
„ Instruction Set For 6440B
Instruction
READ
WRITE
WREN
WRDS
( WRAL )
Op-Code
10101000
10100100
10100011
10100000
10101111
Address
A7 A6 A5 A4 A3 A2 A1 A0
A7 A6 A5 A4 A3 A2 A1 A0
ÕýýÕýýÕýýÕýýÕýýÕýýÕýýÕ
ÕýýÕýýÕýýÕýýÕýýÕýýÕýýÕ
ÕýýÕýýÕýýÕýýÕýýÕýýÕýýÕ
Data
D15 -D0
D15 -D0
D15 -D0
„ Instruction Set For 6480B
Instruction
READ
WRITE
WREN
WRDS
( WRAL )
Op-Code
1 0 1 0 1 0 0 A8
1 0 1 0 0 1 0 A8
10100011
10100000
10101111
Address
A7 A6 A5 A4 A3 A2 A1 A0
A7 A6 A5 A4 A3 A2 A1 A0
ÕýýÕýýÕýýÕýýÕýýÕýýÕýýÕ
ÕýýÕýýÕýýÕýýÕýýÕýýÕýýÕ
ÕýýÕýýÕýýÕýýÕýýÕýýÕýýÕ
Data
D15 -D0
D15 -D0
D15 -D0
Õ:don't care
(Note) The WRAL instruction is used for factory function test only. User can't use this instruction .
DAS03E-00
-5-
1999/05