AT49F040T Datasheet, PDF (1/12 Pages) ATMEL Corporation – 4-Megabit (512K x 8) 5-volt Only CMOS Flash Memory

Features
• Single Voltage Operation
– 5V Read
– 5V Reprogramming
• Fast Read Access Time - 70 ns
• Internal Program Control and Timer
• 16K bytes Boot Block With Lockout
• Fast Erase Cycle Time - 10 seconds
• Byte By Byte Programming - 50 µs/Byte
• Hardware Data Protection
• DATA Polling For End Of Program Detection
• Low Power Dissipation
– 50 mA Active Current
– 100 µA CMOS Standby Current
• Typical 10,000 Write Cycles
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”).
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Pin Configurations
Pin Name
A0 - A18
CE
OE
WE
I/O0 - I/O7
Function
Addresses
Chip Enable
Output Enable
Write Enable
Data Inputs/Outputs
DIP Top View
4-Megabit
(512K x 8)
5-volt Only
CMOS
Flash Memory
AT49F040
AT49F040T
AT49F040/040T
AT49F040/040T
PLCC Top View
TSOP Top View
Type 1
Rev. 0998A-A–01/98
1