Rainbow Electronics AT45DB321B User Manual

Megabit 2.7-volt only dataflash, Features, Description

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1

Features

Single 2.7V - 3.6V Supply

Serial Peripheral Interface (SPI) Compatible

20 MHz Max Clock Frequency

Page Program Operation

– Single Cycle Reprogram (Erase and Program)
– 8192 Pages (528 Bytes/Page) Main Memory

Supports Page and Block Erase Operations

Two 528-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

Hardware Data Protection Feature

100% Compatible to AT45DB321

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

Commercial and Industrial Temperature Ranges

Description

The AT45DB321B 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 34,603,008 bits of memory are organized as 8192 pages of 528 bytes each. In
ad d it io n t o t he m a in me m or y, t he AT45 DB3 21 B a l s o c o nt ains t wo S R A M
data buffers of 528 bytes each. The buffers allow receiving of data while a page in the
main memory is being reprogrammed, as well as reading or writing a continuous data

32-megabit
2.7-volt Only
DataFlash

®

AT45DB321B

TSOP Top View

Type 1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

RDY/BUSY

RESET

WP

NC

NC

NC

VCC

GND

NC

NC

NC

NC

CS

SCK

SI

SO

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

CBGA Top View through Package

A

B

C

D

E

F

G

H

J

1

2

3

4

5

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

VCC

WP

RESET

NC

NC

NC

NC

NC

NC

GND

RDY/BSY

SI

NC

NC

NC

NC

NC

NC

SCK

CS

SO

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

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

DataFlash Card

(1)

Note:

1.

See AT45DCB004 Datasheet

7 6 5 4 3 2 1

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

NC

CS

SCK

SI

SO

NC

NC

NC

NC

NC

NC

NC

VCC

NC

NC

WP

RESET

RDY/BUSY

NC

NC

NC

NC

NC

NC

NC

NC

Rev. 2223D–DFLASH–10/02

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