AT45DB021B Datasheet, PDF (1/33 Pages) ATMEL Corporation – 2-megabit 2.7-volt Only DataFlash

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.
Pin Configurations
Pin Name
CS
Function
Chip Select
SCK
SI
SO
Serial Clock
Serial Input
Serial Output
WP
RESET
RDY/BUSY
Hardware Page Write
Protect Pin
Chip Reset
Ready/Busy
RDY/BUSY 1
RESET 2
WP 3
NC 4
NC 5
VCC 6
GND 7
NC 8
NC 9
NC 10
CS 11
SCK 12
SI 13
SO 14
TSOP Top View
Type 1
28 NC
27 NC
26 NC
25 NC
24 NC
23 NC
22 NC
21 NC
20 NC
19 NC
18 NC
17 NC
16 NC
15 NC
CBGA Top View
through Package
123
A
SCK GND VCC
B
CS RDY/BSY WP
C
SO SI RESET
28-SOIC
GND
1
NC
2
NC
3
CS
4
SCK
5
SI
6
SO
7
NC
8
NC
9
NC
10
NC
11
NC
12
NC
13
NC
14
28
VCC
27
NC
26
NC
25
WP
24
RESET
23
RDY/BUSY
22
NC
21
NC
20
NC
19
NC
18
NC
17
NC
16
NC
15
NC
8-SOIC
SI 1
SCK 2
RESET 3
CS 4
8 SO
7 GND
6 VCC
5 WP
2-megabit
2.7-volt Only
DataFlash^®
AT45DB021B
Rev. 1937F–DFLSH–10/02
1