1
32-megabit
2.7-volt Only
Serial
DataFlash
®
AT45DB321
Recommend using
AT45DB321B for new
designs.
Features
•
Single 2.7V - 3.6V Supply
•
Serial-interface Architecture
•
Page Program Operation
– Single Cycle Reprogram (Erase and Program)
– 8192 Pages (528 Bytes/Page) Main Memory
•
Optional Page and Block Erase Operations
•
Two 528-byte SRAM Data Buffers – Allows Receiving of Data while Reprogramming of
Nonvolatile Memory
•
Internal Program and Control Timer
•
Fast Page Program Time – 7 ms Typical
•
120 µs Typical Page to Buffer Transfer Time
•
Low-power Dissipation
– 4 mA Active Read Current Typical
– 3 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 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. 1121E–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
(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
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
AT45DB321
Preliminary 16-
Megabit 2.7-volt
Only Serial
DataFlash
