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