This X76F640 device has been acquired by
IC MICROSYSTEMS from Xicor, Inc.
64K
X76F640
Secure Serial Flash
DESCRIPTION
8Kx8+32x8
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:
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 Write
providing a minimum endurance of 100,000 cycles
and a minimum data retention of 100 years
.
TM
cell,
—8 lead SOIC
—SmartCard Module
Functional Diagram
CS
SCL
SDA
INTERFACE
LOGIC
32 BYTE
SerialFlash ARRAY
PASSWORD ARRAY
AND PASSWORD
CHIP ENABLE
DATA TRANSFER
ARRAY ACCESS
ENABLE
8K BYTE
SerialFlash ARRAY
ARRAY 0
(PASSWORD PROTECTED)
ARRAY 1
(PASSWORD PROTECTED)
VERIFICATION LOGIC
RST
RESET
RESPONSE REGISTER
RETRY COUNTER
7025 FM 01
∧Xicor,
Inc. 1994, 1995, 1996 Patents
Pending 7025-1.4 3/24/97 T2/C0/D1 SH
1
Characteristics subject to change without notice
ICMIC [ IC MICROSYSTEMS ]
