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IS23SC4428

1-KBYTE EEPROM WITH WRITE PROTECT FUNCTION AND PROGRAMMABLE SECURITY CODE (PSC)

Integrated Silicon Solution 

IS23SC4418

IS23SC4428

ISSI ®

Table 1. Control Words for IS23SC4418/4428 Commands

Command Name

Byte 1

S0 S1 S2 S3 S4 S5

Read 8-bits data without protect bit

011100

Read 9-bits data with protect bit

001100

Write and erase without protect bit(1)

110011

Write and erase with protect bit(1)

100011

Write protect bit with data comparison(1) 0 0 0 0 1 1

A8 A9

A8 A9

A8 A9

A8 A9

A8 A9

A8 A9

Byte 2

A0-A7

A0-A7

A0-A7

A0-A7

A0-A7

A0-A7

Byte 3

D0-D7

Don't Care

Don't Care

Input data

Input data

Compare data

Additional Commands for IS23SC4428 only(3)

Write Error Counter

010011

11

FDH

Bit Mask

Verify first PSC byte

101100

11

FEH

PSC byte 1

Verify second PSC byte

101100

11

FFH

PSC byte 2

Write and erase first PSC byte

without protect bit(2)

110011

11

FEH

PSC byte 1

Write and erase second PSC byte

without protect bit(2)

110011

11

FFH

PSC byte 2

Write and erase first PSC byte

with protect bit(2)

100011

11

FEH

PSC byte 1

Write and erase second PSC byte

with protect bit(2)

100011

11

FFH

PSC byte 2

Read 8-bits first PSC byte

without protect bit(2)

011100

11

FEH

Don't Care

Read 8-bits second PSC byte

without protect bit

011100

11

FFH

Don't Care

Read 9-bits first PSC byte

with protect bit

001100

11

FEH

Don't Care

Read 9-bits second PSC byte

with protect bit

001100

11

FFH

Don't Care

Notes:

1. If the protect bit of the byte address is enabled, the write command will have no effect on the byte content.

2. If the protect bit of the PSC byte is enabled, the write command will have no effect on the PSC byte.

3. For IS23SC4428, locations (1021-1023) are occupied by Error Counter and PSC codes and thus cannot be used for general data

storage.

Integrated Silicon Solution, Inc. — 1-800-379-4774

5

REV. A

11/01/01

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