Preliminary

This is a product that has fixed target specifications but are subject

Ramtron International Corporation

to change pending characterization results.

1850 Ramtron Drive, Colorado Springs, CO 80921

(800) 545-F-RAM, (719) 481-7000

Rev. 1.2

www.ramtron.com

Feb. 2011

Page 1 of

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FM25040B

4Kb Serial 5V F-RAM Memory

Features

4K bit Ferroelectric Nonvolatile RAM

•

Organized as 512 x 8 bits

•

•

38 year Data Retention

•

NoDelay™ Writes

•

Advanced High-Reliability Ferroelectric Process

Very Fast Serial Peripheral Interface - SPI

•

Up to 20 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

•

250

µA Active Current (1 MHz)

•

4

µA (typ.) Standby Current

Industry Standard Configuration

•

Industrial Temperature -40

° C to +85° C

•

8-pin “Green”/RoHS SOIC (-G)

Description

The FM25040B is a 4-kilobit nonvolatile memory

employing an advanced ferroelectric process. A

ferroelectric random access memory or F-RAM is

nonvolatile but operates in other respects as a RAM.

It provides reliable data retention for 38 years while

eliminating the complexities, overhead, and system

level reliability problems caused by EEPROM and

other nonvolatile memories.

The FM25040B 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 without the need

for data polling. The FM25040B is capable of

times more write cycles than EEPROM.

These capabilities make the FM25040B 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 industrial controls where the long write

time of EEPROM can cause data loss.

The FM25040B provides substantial benefits to users

of serial EEPROM, in a hardware drop-in

replacement. The FM25040B uses the high-speed

SPI bus, which enhances the high-speed write

capability of F-RAM technology. The specifications

are guaranteed over an industrial temperature range

of -40°C to +85°C.

Pin Configuration

Pin Names

Function

/CS

Chip Select

/WP

Write Protect

/HOLD

Hold

SCK

Serial Clock

SI

Serial Data Input

SO

Serial Data Output

VDD

Supply Voltage 5V

VSS

Ground

Ordering Information

FM25040B-G

“Green” 8-pin SOIC

FM25040B-GTR

“Green” 8-pin SOIC,

Tape & Reel

CS

SO

WP

VSS

VDD

HOLD

SCK

SI

1

2

3

4

8

7

6

5