AEC Q100 Grade 1 Compliant

This product conforms to specifications per the terms of the Ramtron

Ramtron International Corporation

standard warranty. The product has completed Ramtron’s internal

1850 Ramtron Drive, Colorado Springs, CO 80921

qualification testing and has reached production status.

(800) 545-FRAM, (719) 481-7000

http://www.ramtron.com

Rev. 3.0

July 2007

1 of 13

64Kb FRAM Serial Memory

Features

64K bit Ferroelectric Nonvolatile RAM

•

Organized as 8,192 x 8 bits

•

High Endurance 1 Trillion (10

•

NoDelay™ Writes

•

Advanced high-reliability ferroelectric process

Very Fast Serial Peripheral Interface - SPI

•

Up to 4 MHz maximum bus frequency

•

Direct hardware replacement for EEPROM

•

SPI Mode 0 & 3 (CPOL, CPHA=0,0 & 1,1)

Sophisticated Write Protection Scheme

•

Hardware Protection

•

Software Protection

Low Power Consumption

•

10

µA Standby Current

Industry Standard Configuration

•

Automotive Temperature -40

° C to +125° C

o

Qualified to AEC Q100 Specification

•

“Green”/RoHS 8-pin SOIC

Description

The FM25640 is a 64-kilobit nonvolatile memory

employing an advanced ferroelectric process. A

ferroelectric random access memory or FRAM is

nonvolatile but operates in other respects as a RAM.

It provides reliable data retention for years while

eliminating the complexities, overhead, and system

level reliability problems caused by EEPROM and

other nonvolatile memories.

Unlike serial EEPROMs, the FM25640 performs

write operations at bus speed. No write delays are

incurred. Data is written to the memory array

immediately after it has been successfully transferred

to the device. The next bus cycle may commence

immediately.

In

addition,

the

product

offers

substantial write endurance compared with other

nonvolatile memories. The FM25640 is capable of

supporting up to 10

than most systems will require from a serial memory.

These capabilities make the FM25640 ideal for

nonvolatile memory applications requiring frequent

or rapid writes. Examples range from data collection,

where the number of write cycles may be critical, to

demanding automotive controls where the long write

time of EEPROM can cause data loss.

The FM25640 provides substantial benefits to users

of

serial

EEPROM,

in

a

hardware

drop-in

replacement. The FM25640 uses the high-speed SPI

bus, which enhances the high-speed write capability

of

FRAM

technology.

The

specifications

are

guaranteed over an automotive temperature range of

-40°C to +125°C.

Pin Configuration

Pin Names

Function

/CS

Chip Select

/HOLD

Hold

/WP

Write Protect

SCK

Serial Clock

SI

Serial Data Input

SO

Serial Data Output

VDD

5V

VSS

Ground

Ordering Information

FM25640-GA

“Green” 8-pin SOIC, Auto-

motive Grade 1

CS

SO

WP

VSS

VDD

HOLD

SCK

SI

1

2

3

4

8

7

6

5