Rainbow Electronics AT45DB021B - Manual

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
1 2 3
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
NC
VCC
GND
NC
NC
NC
CS
SCK
SI
SO
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
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
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
8-SOIC
1
2
3
4
8
7
6
5
SI
SCK
RESET
CS
SO
GND
VCC
WP
Rev. 1937F–DFLSH–10/02