1

32-Megabit

2.7-volt Only

Serial

DataFlash

®

AT45DB321

Preliminary

Features

– Single Cycle Reprogram (Erase and Program)

– 8192 Pages (528 Bytes/Page) Main Memory

Nonvolatile Memory

µµµµs Typical Page to Buffer Transfer Time

– 4 mA Active Read Current Typical

–3

µµµµA CMOS Standby Current Typical

Description

The AT45DB321 is a 2.7-volt only, serial interface Flash memory suitable for in-sys-

tem reprogramming. Its 34,603,008 bits of memory are organized as 8192 pages of

528 bytes each. In addition to the main memory, the AT45DB321 also contains two

SRAM data buffers of 528 bytes each. The buffers allow receiving of data while a

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

Rev. 1121A–09/98

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

(continued)

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

1

2345

NC

NC

NC

NC

NC

VCC

WP

RESET

NC

NC

GND

RDY/BSY

SI

NC

NC

SCK

CS

SO

NC

NC

NC

NC

NC

NC

AT45DB321

Preliminary 16-

Megabit 2.7-volt

Only Serial

DataFlash