描述 Description

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.
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.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

特性 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