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Single-voltage Read/Write Operation: 2.7V to 3.6V (BV), 3.0V to 3.6V (LV)

Fast Read Access Time 鈥?70 ns

Internal Erase/Program Control

Sector Architecture

鈥?One 8K Word (16K Bytes) Boot Block with Programming Lockout

鈥?Two 4K Word (8K Bytes) Parameter Blocks

鈥?One 112K Word (224K Bytes) Main Memory Array Block

Fast Sector Erase Time 鈥?10 Seconds

Byte-by-byte or Word-by-word Programming 鈥?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(chǔ) CMOS Standby Current

Typical 10,000 Write Cycles

鈥?/div>

Description

The AT49BV/LV2048A is a 3-volt, 2-megabit Flash memory organized as 262,144

words of 8 bits each or 128K words of 16 bits each. Manufactured with Atmel鈥檚

advanced nonvolatile CMOS technology, the device offers access times to 70 ns with

power dissipation of just 67 mW at 2.7V read. When deselected, the CMOS standby

current is less than 50 碌A(chǔ).

Th e device co nt ain s a us e r-e n a ble d 鈥?bo o t blo ck 鈥?pr ot ec tio n fe a tu re. Th e

AT49BV/LV2048A locates the boot block at lowest order addresses (鈥渂ottom boot鈥?.

To allow for simple in-system reprogrammability, the AT49BV/LV2048A 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 con-

tention. Reprogramming the AT49BV/LV2048A is performed by first erasing a block of

data and then programming on a byte-by-byte or word-by-word basis.

2-megabit

(256K x 8/

128K x 16)

Single 2.7-volt

Battery-Voltage

鈩?/div>

Flash Memory

AT49BV2048A

AT49LV2048A

Pin Configurations

Pin Name

A0 - A16

CE

OE

WE

RESET

VPP

I/O0 - I/O15

I/O15(A-1)

BYTE

NC

Function

Addresses

Chip Enable

Output Enable

Write Enable

Reset

VPP can be left unconnected or connected to VCC, GND, 5V or

12V. The input has no effect on the operation of the device.

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. 1914D鈥揊LASH鈥?3/02

1

型號(hào)

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