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.
The X76F640 features a serial interface and software protocol allowing operation on a popular two wire bus.
The bus signals are a clock Input (SCL) and a bidirectional data input and output (SDA). Access to the device is controlled through a chip select (CS) input, allowing any number of devices to share the same bus.
The X76F640 also features a synchronous response to reset providing an automatic output of a hard-wired 32-bit data stream conforming to the industry standard for memory cards.
The X76F640 utilizes Xicor’s proprietary Direct WriteTM cell, providing a minimum endurance of 100,000 cycles and a minimum data retention of 100 years.
• 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