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4-megabit
(512K x 8/
256K x 16)
Flash Memory
AT49F4096A
Description
The AT49F4096A is a 5-volt, 4-megabit Flash memory organized as 524,288 words of
8 bits each or 256K words of 16 bits each. Manufactured with Atmel鈥檚 advanced non-
volatile CMOS technology, the device offers access times to 70 ns with power
dissipation of just 275 mW. When deselected, the CMOS standby current is less than
100 碌A(chǔ).
The device contains a user-enabled 鈥渂oot block鈥?protection feature. The AT49F4096A
locates the boot block at lowest order addresses (鈥渂ottom boot鈥?.
To allow for simple in-system reprogrammability, the AT49F4096A does not require
high-input voltages for programming. Reading data out of the device is similar to read-
ing from an EPROM; it has standard CE, OE and WE inputs to avoid bus contention.
Reprogramming the AT49F4096A is performed by first erasing a block of data and
then programming on a byte-by-byte or word-by-word basis.
Pin Configurations
Pin Name
A0 - A17
CE
OE
WE
RESET
I/O0 - I/O15
I/O15(A-1)
BYTE
NC
Function
Addresses
Chip Enable
Output Enable
Write Enable
Reset
Data Inputs/Outputs
I/O15 (Data Input/Output, Word Mode)
A-1 (LSB Address Input, Byte Mode)
Selects Byte or Word Mode
No Connect
Rev. 1604D鈥揊LASH鈥?1/02
1