1

DIP Top View

4-Megabit

(512K x 8)

5-volt Only

CMOS

Flash Memory

AT49F040

AT49F040T

AT49F040/040T

Features

– 5V Read

– 5V Reprogramming

µs/Byte

– 50 mA Active Current

– 100

µA CMOS Standby Current

Description

The AT49F040 is a 5-volt-only in-system Flash Memory. Its 4 megabits of memory is

organized as 524,288 words by 8 bits. Manufactured with Atmel’s advanced nonvola-

tile CMOS technology, the device offers access times to 70 ns with power dissipation

of just 275 mW over the commercial temperature range. When the device is dese-

lected, the CMOS standby current is less than 100

µA.

The device contains a user-enabled “boot block” protection feature. Two versions of

the feature are available: the AT49F040 locates the boot block at lowest order

addresses (“bottom boot”); the AT49F040T locates it at highest order addresses (“top

boot”).

Rev. 0998A-A–01/98

AT49F040/040T

Pin Configurations

Pin Name

Function

A0 - A18

Addresses

CE

Chip Enable

OE

Output Enable

WE

Write Enable

I/O0 - I/O7

Data Inputs/Outputs

PLCC Top View

TSOP Top View

Type 1

(continued)