This product conforms to specifications per the terms of the Ramtron

standard warranty. The product has completed Ramtron’s

internal qualification testing and has reached production status.

Cypress Semiconductor Corporation

•

198 Champion Court

•

San Jose, CA 95134-1709

•

408-943-2600

Document Number: 001-84477 Rev. *B

Revised May 29, 2013

FM25CL64B

64Kb Serial 3V F-RAM Memory

Features

64K bit Ferroelectric Nonvolatile RAM

Organized as 8,192 x 8 bits

High Endurance 100 Trillion (10

NoDelay™ Writes

Advanced High-Reliability Ferroelectric Process

Very Fast Serial Peripheral Interface - SPI

Up to 20 MHz 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

Low Voltage Operation 2.7-3.65V

200 A Active Current (1 MHz)

3 A (typ.) Standby Current

Industry Standard Configuration

Industrial Temperature -40 C to +85 C

8-pin “Green”/RoHS SOIC and TDFN Packages

Description

The FM25CL64B is a 64-kilobit nonvolatile memory

employing an advanced ferroelectric process. A

ferroelectric random access memory or F-RAM is

nonvolatile and performs reads and writes like 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 FM25CL64B performs write operations at bus

speed. No write delays are incurred. Data is written to

the memory array immediately after each byte has

been successfully transferred to the device. The next

bus cycle may commence immediately without the

need for data polling. In addition, the product offers

substantial write endurance compared with other

nonvolatile memories. The FM25CL64B is capable

of supporting 10

times more write cycles than EEPROM.

These capabilities make the FM25CL64B 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 FM25CL64B provides substantial benefits to

users of serial EEPROM as a hardware drop-in

replacement. The FM25CL64B uses the high-speed

SPI bus, which enhances the high-speed write

capability

of

F-RAM

technology.

Device

specifications are guaranteed over an industrial

temperature range of -40°C to +85°C.

Pin Configuration

Pin Name

Function

/CS

Chip Select

/WP

Write Protect

/HOLD

Hold

SCK

Serial Clock

SI

Serial Data Input

SO

Serial Data Output

VDD

Supply Voltage

VSS

Ground

Ordering Information

FM25CL64B-G

“Green” 8-pin SOIC

FM25CL64B-GTR

“Green” 8-pin SOIC,

Tape & Reel

FM25CL64B-DG

“Green”/RoHS 8-pin TDFN

FM25CL64B-DGTR

“Green”/RoHS 8-pin TDFN,

Tape & Reel

/CS

SO

/WP

VSS

VDD

/HOLD

SCK

SI

8

7

6

5

1

2

3

4

Top View

CS

SO

WP

VSS

VDD

HOLD

SCK

SI

1

2

3

4

8

7

6

5