AT45DB021B-TC datasheet(1/33 Pages) ATMEL

Part #	AT45DB021B-TC

Description	2-megabit 2.7-volt Only DataFlash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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1

Features

• Single 2.7V - 3.6V Supply

• Serial Peripheral Interface (SPI) Compatible

• Page Program Operation

– Single Cycle Reprogram (Erase and Program)

– 1024 Pages (264 Bytes/Page) Main Memory

• Supports 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

– Ideal for Code Shadowing Applications

• Low Power Dissipation

– 4 mA Active Read Current Typical

– 2 µA CMOS Standby Current Typical

• 20 MHz Max Clock Frequency

• Hardware Data Protection Feature

• 100% Compatible to AT45DB021 and AT45DB021A

• 5.0V-tolerant Inputs: SI, SCK, CS, RESET and WP Pins

• Commercial and Industrial Temperature Ranges

Description

The AT45DB021B is a 2.7-volt only, serial interface Flash memory ideally suited for

a wide variety of digital voice-, image-, program code- and data-storage applications.

Its 2,162,688 bits of memory are organized as 1024 pages of 264 bytes each. In addi-

tion to the main memory, the AT45DB021B also contains two SRAM data buffers

of 264 bytes each. The buffers allow receiving of data while a page in the main mem-

ory is being reprogrammed, as well as reading or writing a continuous data stream.

2-megabit

2.7-volt Only

DataFlash

®

AT45DB021B

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

CBGA Top View

through Package

A

B

C

123

VCC

WP

RESET

GND

RDY/BSY

SI

SCK

CS

SO

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

28-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

8-SOIC

1

2

3

4

8

7

6

5

SI

SCK

RESET

CS

SO

GND

VCC

WP

Rev. 1937F–DFLSH–10/02

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AT45DB021B-TC Datasheet(PDF) 1 Page - ATMEL Corporation

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