DESCRIPTION

The X76F640 is a Password Access Security Supervisor, containing one 65536-bit Secure Serial Flash array and one 256-bit Secure Serial Flash array. Access to each memory array is controlled by two 64-bit passwords.

These passwords protect read and write operations of the memory array. A separate RESET password is used to reset the passwords and clear the memory arrays in the event the read and write passwords are lost.

FEATURES

? 64-bit Password Security

— Five 64-bit Passwords for Read, Program and Reset

? 8192 Byte+32 Byte Password Protected Arrays

— Seperate Read Passwords

— Seperate Write Passwords

— Reset Password

? Programmable Passwords

? Retry Counter Register

— Allows 8 tries before clearing of both arrays

— Password Protected Reset

? 32-bit Response to Reset (RST Input)

? 32 byte Sector Program

? 400kHz Clock Rate

? 2 wire Serial Interface

? Low Power CMOS

— 2.7 to 5.5V operation

— Standby current Less than 1μA

— Active current less than 3 mA

? High Reliability Endurance:

— 100,000 Write Cycles

? Data Retention: 100 years

? Available in:

— 8 lead SOIC

— SmartCard Module