NM24C02U Datasheet, PDF(1/13 Page) Fairchild Semiconductor – 2K-Bit Serial EEPROM 2-Wire Bus Interface

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NM24C02U Datasheet, PDF (1/13 Pages) Fairchild Semiconductor – 2K-Bit Serial EEPROM 2-Wire Bus Interface

August 1999

NM24C02U/NM24C03U

2K-Bit Serial EEPROM

2-Wire Bus Interface

General Description

The NM24C02U/NM24C03U are 2K (2,048) bit serial interface

CMOS EEPROMs (Electrically Erasable Programmable Read-

Only Memory). These devices fully conform to the Standard I2Câ¢

2-wire protocol which uses Clock (SCL) and Data I/O (SDA) pins

to synchronously clock data between the "master" (for example a

microprocessor) and the "slave" (the EEPROM device). In addi-

tion, the serial interface allows a minimal pin count packaging

designed to simplify PC board layout requirements and offers the

designer a variety of low voltage and low power options.

NM24C03U incorporates a hardware "Write Protect" feature, by

which, the upper half of the memory can be disabled against

programming by connecting the WP pin to VCC. This section of

memory then effectively becomes a ROM (Read-Only Memory)

and can no longer be programmed as long as WP pin is connected

to VCC.

Fairchild EEPROMs are designed and tested for applications requir-

ing high endurance, high reliability and low power consumption for a

continuously reliable non-volatile solution for all markets.

Functions

I I2Câ¢ compatible interface

I 2,048 bits organized as 256 x 8

I Extended 2.7V â 5.5V operating voltage

I 100 KHz or 400 KHz operation

I Self timed programming cycle (6ms typical)

I "Programming complete" indicated by ACK polling

I NM24C03U: Memory "Upper Block" Write Protect pin

Features

I The I2Câ¢ interface allows the smallest I/O pincount of any

EEPROM interface

I 16 byte page write mode to minimize total write time per byte

I Typical 200ÂµA active current (ICCA)

I Typical 1ÂµA standby current (ISB) for "L" devices and 0.1ÂµA

standby current for "LZ" devices

I Endurance: Up to 1,000,000 data changes

I Data retention greater than 40 years

Block Diagram

VCC

VSS

SDA

SCL

START

STOP

LOGIC

SLAVE ADDRESS

COMPARATOR

CONTROL

LOGIC

WORD

ADDRESS

COUNTER

R/W

XDEC

H.V. GENERATION

TIMING &CONTROL

E2PROM

ARRAY

YDEC

DIN

DATA REGISTER

DOUT

I2Câ¢ is a registered trademark of Philips Electronics N.V.

NM24C02U/NM24C03U Rev. B.1

DS800007-1

www.fairchildsemi.com

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