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X76F640 Datasheet, PDF (1/17 Pages) Xicor Inc. – Secure SerialFlash | |||
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This X76F640 device has been acquired by
IC MICROSYSTEMS from Xicor, Inc.
64K
X76F640
8Kx8+32x8
Secure Serial Flash
FEATURES
â¢64-bit Password Security
âFive 64-bit Passwords for Read, Program
and Reset
â¢8192 Byte+32 Byte Password Protected Arrays
âSeperate Read Passwords
âSeperate Write Passwords
âReset Password
â¢Programmable Passwords
â¢Retry Counter Register
âAllows 8 tries before clearing of both arrays
âPassword Protected Reset
â¢32-bit Response to Reset (RST Input)
â¢32 byte Sector Program
â¢400kHz Clock Rate
â¢2 wire Serial Interface
â¢Low Power CMOS
â2.7 to 5.5V operation
âStandby current Less than 1µA
âActive current less than 3 mA
â¢High Reliability Endurance:
â100,000 Write Cycles
â¢Data Retention: 100 years
â¢Available in:
â8 lead SOIC
âSmartCard Module
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 Xicorâs proprietary Direct WriteTM cell,
providing a minimum endurance of 100,000 cycles
and a minimum data retention of 100 years.
Functional Diagram
CS
SCL
SDA
INTERFACE
LOGIC
RST
â§Xicor, Inc. 1994, 1995, 1996 Patents
Pending 7025-1.4 3/24/97 T2/C0/D1 SH
CHIP ENABLE
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
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