AK6420A-1 Datasheet, PDF (5/15 Pages) Asahi Kasei Microsystems – 2K / 4K / 8Kbit Serial CMOS EEPROM

ASAHI KASEI
[AK6420A/40A/80A]
Functional Description
The AK6420A/40A/80A 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 (8bits × 2).
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, AK6420A/40A/80A 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 6420A
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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Data
D15 -D0
D15 -D0
D15 -D0
„ Instruction Set For 6440A
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
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Data
D15 -D0
D15 -D0
D15 -D0
„ Instruction Set For 6480A
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
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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 .
DAS01E-00
-5-
1999/05