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