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FM93C66 Rev. C.1

July 2000

© 2000 Fairchild Semiconductor International

FM93C66

4096-Bit Serial CMOS EEPROM

(MICROWIRE™ Synchronous Bus)

General Description

FM93C66 is a 4096-bit CMOS non-volatile EEPROM organized

as 256 x 16-bit array. This device features MICROWIRE interface

which is a 4-wire serial bus with chipselect (CS), clock (SK), data

input (DI) and data output (DO) signals. This interface is compat-

ible to many of standard Microcontrollers and Microprocessors.

There are 7 instructions implemented on the FM93C66 for various

Read, Write, Erase, and Write Enable/Disable operations. This

device is fabricated using Fairchild Semiconductor floating-gate

CMOS process for high reliability, high endurance and low power

consumption.

“LZ” and “L” versions of FM93C66 offer very low standby current

making them suitable for low power applications. This device is

offered in both SO and TSSOP packages for small space consid-

erations.

Functional Diagram

Features

I Wide V

I Typical active current of 200µA

10

µA standby current typical

1

µA standby current typical (L)

0.1

µA standby current typical (LZ)

I No Erase instruction required before Write instruction

I Self timed write cycle

I Device status during programming cycles

I 40 year data retention

I Endurance: 1,000,000 data changes

I Packages available: 8-pin SO, 8-pin DIP, 8-pin TSSOP

INSTRUCTION

DECODER

CONTROL LOGIC

AND CLOCK

GENERATORS

HIGH VOLTAGE

GENERATOR

AND

PROGRAM

TIMER

INSTRUCTION

REGISTER

ADDRESS

REGISTER

EEPROM ARRAY

READ/WRITE AMPS

DATA IN/OUT REGISTER

16 BITS

DECODER

16

16

DATA OUT BUFFER

CS

SK

DI

DO