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2.7V to 3.6V Read/Write Operation

Fast Read Access Time - 120 ns

Internal Erase/Program Control

Sector Architecture

鈥?One 8K Words (16K bytes) Boot Block with Programming Lockout

鈥?Two 4K Words (8K bytes) Parameter Blocks

鈥?One 240K Words (480K bytes) Main Memory Array Block

Fast Sector Erase Time - 10 seconds

Byte-by-Byte or Word-By-Word Programming - 30

碌s

Typical

Hardware Data Protection

DATA Polling For End Of Program Detection

Low-Power Dissipation

鈥?25 mA Active Current

鈥?50

碌A

CMOS Standby Current

Typical 10,000 Write Cycles

鈥?/div>

Description

The AT49BV004(T) and AT49BV4096A(T) are 3-volt, 4-megabit Flash Memories

organized as 524,288 words of 8 bits each or 256K words of 16 bits each. Manufac-

tured with Atmel鈥檚 advanced nonvolatile CMOS technology, the devices offer access

times to 120 ns with power dissipation of just 67 mW at 2.7V read. When deselected,

the CMOS standby current is less than 50

碌A.

The device contains a user-enabled 鈥渂oot block鈥?protection feature. Two versions of

the feature are available: the AT49BV004/4096A locates the boot block at lowest

order addresses (鈥渂ottom boot鈥?; the AT49BV004T/4096AT locates it at highest order

addresses (鈥渢op boot鈥?.

To allow for simple in-system reprogrammability, the AT49BV004(T)/4096A(T) does

not require high input voltages for programming. Reading data out of the device is

similar to reading from an EPROM; it has standard CE, OE, and WE inputs to avoid

bus contention. Reprogramming the AT49BV004(T)/4096A(T) is performed by first

erasing a block of data and then programming on a byte-by-byte or word-by-word

basis.

(continued)

4-Megabit

(512K x 8/

256K x 16)

CMOS Flash

Memory

AT49BV004

AT49BV004T

AT49BV4096A

AT49BV4096AT

Preliminary

Pin Configurations

Pin Name

A0 - A18

CE

OE

WE

RESET

RDY/BUSY

VPP

I/O0 - I/O14

I/O15(A-1)

BYTE

NC

Function

Addresses

Chip Enable

Output Enable

Write Enable

Reset

Ready/Busy Output

Optional Power Supply for Faster

Program/Erase Operations

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. 1139A鈥?9/98

1

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