AT45DB021A datasheet(1/28 Pages) ATMEL

Part #	AT45DB021A

Description	2-megabit 2.7-volt Only Serial DataFlash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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1

Features

• 100% Compatible to AT45D021

• Single 2.7V - 3.6V Supply

• Serial Interface Architecture

• Page Program Operation

– Single Cycle Reprogram (Erase and Program)

– 1024 Pages (264 Bytes/Page) Main Memory

• Optional Page and Block Erase Operations

• Two 264-byte SRAM Data Buffers – Allows Receiving of Data

while Reprogramming of Nonvolatile Memory

• Continuous Read Capability through Entire Array

• Internal Program and Control Timer

• Low Power Dissipation

– 4 mA Active Read Current Typical

– 2 µA CMOS Standby Current Typical

• 13 MHz Max Clock Frequency

• Hardware Data Protection Feature

• Serial Peripheral Interface (SPI) Compatible – Modes 0 and 3

• CMOS and TTL Compatible Inputs and Outputs

• Commercial and Industrial Temperature Ranges

Description

The AT45DB021A is a 2.7-volt only, serial interface Flash memory suitable for

in-system reprogramming. Its 2,162,688 bits of memory are organized as 1024 pages

of 264 bytes each. In addition to the main memory, the AT45DB021A also contains

two SRAM data buffers of 264 bytes each. The buffers allow receiving of data while a

page in the main memory is being reprogrammed. Unlike conventional Flash

2-megabit

2.7-volt Only

Serial

DataFlash®

AT45DB021A

Recommend using

AT45DB021B for new

designs.

Rev. 1642C–01/01

Pin Configurations

Pin Name

Function

CS

Chip Select

SCK

Serial Clock

SI

Serial Input

SO

Serial Output

WP

Hardware Page Write

Protect Pin

RESET

Chip Reset

RDY/BUSY

Ready/Busy

PLCC

Note: PLCC package pins 16

and 17 are DON’T CONNECT.

5

6

7

8

9

10

11

12

13

29

28

27

26

25

24

23

22

21

SCK

SI

SO

NC

WP

RESET

RDY/BUSY

NC

TSOP Top View

Type 1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

RDY/BUSY

RESET

WP

NC

VCC

GND

NC

CS

SCK

SI

SO

NC

SOIC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

GND

NC

CS

SCK

SI

SO

NC

VCC

NC

WP

RESET

RDY/BUSY

NC

(continued)

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