Rainbow Electronics AT29C256 User Manual

Features, Description, Pin configurations

Features

•

Fast Read Access Time – 70 ns

•

5-volt Only Reprogramming

•

Page Program Operation

– Single Cycle Reprogram (Erase and Program)
– Internal Address and Data Latches for 64 Bytes

•

Internal Program Control and Timer

•

Hardware and Software Data Protection

•

Fast Program Cycle Times

– Page (64 Byte) Program Time – 10 ms
– Chip Erase Time– 10 ms

•

DATA Polling for End of Program Detection

•

Low-power Dissipation

– 50 mA Active Current
– 300

µA CMOS Standby Current

•

Typical Endurance > 10,000 Cycles

•

Single 5V

± 10% Supply

•

CMOS and TTL Compatible Inputs and Outputs

•

Commercial and Industrial Temperature Ranges

Description

The AT29C256 is a five-volt-only in-system Flash programmable and erasable read
only memory (PEROM). Its 256K of memory is organized as 32,768 words by 8 bits.
Manufactured with Atmel’s advanced nonvolatile CMOS technology, the device offers
access times to 70 ns with power dissipation of just 275 mW. When the device is
deselected, the CMOS standby current is less than 300 µA. The device endurance is
such that any sector can typically be written to in excess of 10,000 times.

256K (32K x 8)
5-volt Only
Flash Memory

AT29C256

Rev. 0046O–FLASH–06/02

PLCC and LCC Top View

Note:

PLCC package pins 1 and 17 are
DON’T CONNECT.

Pin Configurations

Pin Name

Function

A0 - A14

Addresses

Chip Enable

Output Enable

Write Enable

I/O0 - I/O7

Data Inputs/Outputs

No Connect

Don’t Connect

I/O0

A11

A10

I/O7

I/O6

I/O1

I/O2

GND

I/O3

I/O4

I/O5

A12

VCC

A14

A13

DIP Top View

TSOP Top View

Type 1

A12

I/O0

I/O1

I/O2

GND

VCC

A14

A13

A11

A10

I/O7

I/O6

I/O5

I/O4

I/O3

A11

A13

A14

VCC

A12

A10

I/O7

I/O6

I/O5

I/O4

I/O3

GND

I/O2

I/O1

I/O0

Table of contents

Rainbow Electronics AT29C256 User Manual

Features, Description, Pin configurations

Document Outline