X76F641 Datasheet, PDF (1/17 Pages) Xicor Inc. – Secure SerialFlash

This X76F641 device has been acquired by
IC MICROSYSTEMS from Xicor, Inc.
64K
X76F641
ICmic^TM
IC MICROSYSTEMS
8Kx8 + 32x8
Secure Serial Flash
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
—2.0 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 EIAJ SOIC
—SmartCard Module
DESCRIPTION
The X76F641 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 five 64-bit passwords
each. These passwords protect read and write opera-
tions 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 X76F641 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 bidirec-
tional data input and output (SDA).
The X76F641 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 X76F641 utilizes Xicor’s proprietary Direct Write^TM cell,
providing a minimum endurance of 100,000 cycles
and a minimum data retention of 100 years.
Functional Diagram
SCL
SDA
INTERFACE
LOGIC
RST
∧Xicor, Inc. 1994, 1995, 1996 Patents
Pending 9900-5004.5 3/9/99 EP
DATA TRANSFER
ARRAY ACCESS
ENABLE
PASSWORD ARRAY
AND PASSWORD
VERIFICATION LOGIC
RESET
RESPONSE REGISTER
1
8K BYTE
SerialFlash ARRAY
ARRAY 0
(PASSWORD PROTECTED)
32 BYTE
SerialFlash ARRAY
ARRAY 1
(PASSWORD PROTECTED)
RETRY COUNTER
7025 FM 01
Characteristics subject to change without notice