X76F640A Xicor, X76F640A Datasheet
X76F640A
Manufacturer Part Number
X76F640A
Description
Manufacturer
Xicor
Datasheet
1.X76F640A.pdf
(17 pages)
Specifications of X76F640A
Case
SOP8
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Functional Diagram
64K
FEATURES
• 64-bit Password Security
• 8192 Byte+32 Byte Password Protected Arrays
• Programmable Passwords
• Retry Counter Register
• 32-bit Response to Reset (RST Input)
• 32 byte Sector Program
• 400kHz Clock Rate
• 2 wire Serial Interface
• Low Power CMOS
• High Reliability Endurance:
• Data Retention: 100 years
• Available in:
7025-1.4 3/24/97 T2/C0/D1 SH
Xicor, Inc. 1994, 1995, 1996 Patents Pending
—Five 64-bit Passwords for Read, Program
—Seperate Read Passwords
—Seperate Write Passwords
—Reset Password
—Allows 8 tries before clearing of both arrays
—Password Protected Reset
—2.7 to 5.5V operation
—Standby current Less than 1 A
—Active current less than 3 mA
—100,000 Write Cycles
—8 lead SOIC
—SmartCard Module
and Reset
SDA
SCL
RST
CS
INTERFACE
LOGIC
Secure SerialFlash
X76F640
DATA TRANSFER
VERIFICATION LOGIC
RESPONSE REGISTER
CHIP ENABLE
PASSWORD ARRAY
1
AND PASSWORD
ARRAY ACCESS
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 Xicor’s proprietary Direct Write
cell, providing a minimum endurance of 100,000 cycles
and a minimum data retention of 100 years.
ENABLE
RESET
Characteristics subject to change without notice
(PASSWORD PROTECTED)
(PASSWORD PROTECTED)
SerialFlash ARRAY
SerialFlash ARRAY
RETRY COUNTER
8Kx8+32x8
8K BYTE
ARRAY 0
ARRAY 1
32 BYTE
7025 FM 01
TM