IS23SC4442 datasheet(10/21 Pages) ISSI

Part #	IS23SC4442

Description	256 BYTE EEPROM WITH WRITE PROTECT FUNCTION AND PROGRAMMABLE SECURITY

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Manufacturer	ISSI [Integrated Silicon Solution, Inc]

Direct Link	http://www.issi.com

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

Rev. 00B

08/01/03

IS23SC4442

ISSI®

Read Protection Memory

The command reads out 32 bits to I/O on continuous 32

clock pulses. By an additional clock pulse, the I/O is set

to high level. The protection memory can always be

read.

Figure: Read Protection Memory

Address (decimal)

Main Memory

Protection Memory

Security Memory

255

Data Byte 255 (D7 ...D0)

——

::

——

32

Data Byte 32 (D7 ... D0)

——

31

Data Byte 31 (D7...D0)

Protection Bit 31 (D31)

—

::

:

—

1

Data Byte 1 (D7 ... D0)

Protection Bit 1 (D1)

Reference Data Byte 1

(D7...D0)

0

Data Byte 0 (D7 ... D0)

Protection Bit 0 (D0)

Error Counter

B7

B6

B5

B4

B3

B2

B1

B0

Control

Address

Data

A7... A0

D7... D0

0

1

0

1

0

No Effect

34

H

Binary

Hexadecimal

No Effect

0

1

24

32

D31

B7

B0

Command

CLK

I/O

IC sets I/O

To Level Z

Start

from IFD

...

..

...

24

0

1

..

D0

D1

D8

D9

D24

Stop

from IFD

Start of

Outgoing Data

Data of

Byte 1

Data of

Byte 2

Data of

byte 4

IFD set I/O

to level L

Outgoing Data

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