(continued)

4 Megabit

(512K x 8)

5-volt Only

CMOS Flash

Memory

Preliminary

Features

- 5V Read

- 5V Reprogramming

- 50 mA Active Current

- 100

µA CMOS Standby Current

Pin Configurations

Pin Name

Function

A0 - A18

Addresses

CE

Chip Enable

OE

Output Enable

WE

Write Enable

I/O0 - I/O7

Data Inputs/Outputs

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 90 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.

To allow for simple in-system reprogrammability, the AT49F040 does not require high

input voltages for programming. Five-volt-only commands determine the read and

programming operation of the device. Reading data out of the device is similar to

reading from an EPROM. Reprogramming the AT49F040 is performed by erasing

the entire 4 megabits of memory and then programming on a byte by byte basis. The

byte programming time is a fast 50

µs. The end of a program cycle can be optionally

detected by the DATA polling feature. Once the end of a byte program cycle has been

detected, a new access for a read or program can begin. The typical number of pro-

gram and erase cycles is in excess of 10,000 cycles.

Description

AT49F040

TSOP Top View

Type 1

PLCC Top View

0359C

DIP Top View

AT49F040

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