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.

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)