X76F640A Xicor, X76F640A Datasheet

X76F640A

Manufacturer Part Number

X76F640A

Description

Manufacturer

Xicor

Datasheet

1.X76F640A.pdf (17 pages)

Specifications of X76F640A

Case

SOP8

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Bonase Electronics (HK) Co., Limited

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X76F640A

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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

INTERFACE

LOGIC

Secure SerialFlash

X76F640

DATA TRANSFER

VERIFICATION LOGIC

RESPONSE REGISTER

CHIP ENABLE

PASSWORD ARRAY

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)

SerialFlash ARRAY

RETRY COUNTER

8Kx8+32x8

8K BYTE

ARRAY 0

ARRAY 1

32 BYTE

7025 FM 01

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