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

Rev. 3.0

www.ramtron.com

Jan. 2012

Page 1 of 13

FM24CL64B

64Kb Serial 3V F-RAM Memory

Features

64K bit Ferroelectric Nonvolatile RAM



Organized as 8,192 x 8 bits



High Endurance 10



38 year Data Retention



NoDelay™ Writes



Advanced High-Reliability Ferroelectric Process

Fast Two-wire Serial Interface



Up to 1 MHz maximum bus frequency



Direct hardware replacement for EEPROM



Supports legacy timing for 100 kHz & 400 kHz

Low Power Operation



2.7V-3.6V Operation



100 A Active Current (100 kHz)



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 FM24CL64B 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 FM24CL64B performs write operations at bus

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

the memory array in the cycle after it has been

successfully transferred to the device. The next bus

cycle may commence immediately without the need

for data polling. The FM24CL64B is capable of

supporting 10

more write cycles than EEPROM.

These capabilities make the FM24CL64B 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

combination of features allows more frequent data

writing with less overhead for the system.

The FM24CL64B provides substantial benefits to

users of serial EEPROM, yet these benefits are

available in a hardware drop-in replacement. The

FM24CL64B is available in an industry standard 8-

pin SOIC package and uses a familiar two-wire

protocol. The specifications are guaranteed over an

industrial temperature range of -40°C to +85°C.

Pin Configuration

A0

A1

A2

VSS

VDD

WP

SCL

SDA

1

2

3

4

8

7

6

5

Pin Names

Function

A0-A2

Device Select Address

SDA

Serial Data/address

SCL

Serial Clock

WP

Write Protect

VSS

Ground

VDD

Supply Voltage

Ordering Information

FM24CL64B-G

“Green”/RoHS 8-pin SOIC

FM24CL64B-GTR

“Green”/RoHS 8-pin SOIC,

Tape & Reel

FM24CL64B-DG

“Green”/RoHS 8-pin TDFN

FM24CL64B-DGTR

“Green”/RoHS 8-pin TDFN,

Tape & Reel

A0

A1

A2

VSS

VDD

WP

SCL

SDA

8

7

6

5

1

2

3

4

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