IS23SC4442 データシートの表示（PDF） - Integrated Silicon Solution

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IS23SC4442

256 BYTE EEPROM WITH WRITE PROTECT FUNCTION AND PROGRAMMABLE SECURITY

Integrated Silicon Solution 

IS23SC4442

MEMORY OVERVIEW

ISSI ®

VCC

RST

CLK

I/O

GND

Reset,

Blockade

Logic

Interface

Sequencer

and

Security

Logic

Main

Memory

High-Volt

Generator

225

224 Byte

Protection

Memory

(PROM)

Unprotected

Data Memory

32

31 32 Byte

Protectable

Data Memory

Decoder

Manufacturer

0

Code

Functional Description

The IS23SC4442 works on a 2-wire serial transmission

protocol. Data is input or output from the chip through

the I/O pin at the falling edge of CLK. The following are

the four modes of operations:

– Reset and Answer-to-Reset

– Command Mode

– Outgoing Data Mode

– Processing Mode

Reset and Answer-to-Reset

The Answer-to-Reset operation conforms to ISO 7816-3

ATR standard. The reset action can be invoked at any

time during the operation to terminate any active com-

mand operation. With RST High, the internal address

counter is set to zero by the CLK pulse. The LSB of the

first byte data in the memory will be output from I/O when

RST goes from High to Low. By continuing to send

pluses to CLK, the contents of the first four bytes will be

output from I/O pin. After the ATR process completes,

the I/O pin will be set to high impedance.

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

3

Rev. 00B

08/01/03

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