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X76F640 Datasheet, PDF (1/17 Pages) Xicor Inc. – Secure SerialFlash | |||
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64K
X76F640
8Kx8+32x8
Secure SerialFlash
FEATURES
⢠64-bit Password Security
âFive 64-bit Passwords for Read, Program
and Reset
⢠8192 Byte+32 Byte Password Protected Arrays
âSeperate Read Passwords
âSeperate Write Passwords
âReset Password
⢠Programmable Passwords
⢠Retry Counter Register
âAllows 8 tries before clearing of both arrays
âPassword Protected Reset
⢠32-bit Response to Reset (RST Input)
⢠32 byte Sector Program
⢠400kHz Clock Rate
⢠2 wire Serial Interface
⢠Low Power CMOS
â2.7 to 5.5V operation
âStandby current Less than 1µA
âActive current less than 3 mA
⢠High Reliability Endurance:
â100,000 Write Cycles
⢠Data Retention: 100 years
⢠Available in:
â8 lead SOIC
âSmartCard Module
DESCRIPTION
The X76F640 is a Password Access Security Supervisor,
containing one 65536-bit Secure SerialFlash array and
one 256-bit Secure SerialFlash 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 bidirec-
tional 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
©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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