BL7431A Datasheet, PDF (1/4 Pages) SHANGHAI BELLING CO., LTD. – It can be used widely in intelligent public telephone area

BL7431A 256-Bit EEPROM Logical
Encrypted Chip
Description
BL7431A is the memory card chip developed
by Shanghai Belling Co.,Ltd.. The chip uses
Shanghai Belling’s 1.2um CMOS & EEPROM
process. It has 256 bits EEPROM(A type) or
512 bits EEPROM(B type) with logical
encryption function, its contact configuration is
in accordance to ISO standard 7816-
3(Synchronous Transmission). It can be used
widely in intelligent public telephone area.
Pin Diagram
V
CC
C₁
RST C₂
CLK C3
Features
256X 1bit E²PROM(A Type)；512 X 1bit E²PROM(B Type)
Read and write by bit, erase by byte
Logical encryption ensure the security of data and password
Typical EEPROM program time is 5ms
Operation Voltage：5V
Operation Current：<1mA
Minimal Erase/Write Cycle：10⁵
Data Retention: no less than 10 year
In accordance to ISO standard 7816-3(Synchronous Transmission)
C₅ GND
C₆ N.C.
C₇ I/O
Pin Description
Pin No.
1
2
3
4
5
6
Parameter
C1
C2
C3
C5
C6
C7
Symbol
VCC
RST
CLK
GND
N.C.
I/O
Test Condition
Supply Voltage
Control input (reset signal)
Clock input
Ground
Not connected
Bidrectional data line (open drain)
Function Description
Block Diagram
http://www.belling.com.cn
-1-
Total 4 Pages
8/16/2006