FM31278_11 datasheet(2/26 Pages) RAMTRON

Part #	FM31278

Description	5V Integrated Processor Companion with Memory

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Manufacturer	RAMTRON [Ramtron International Corporation]

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FM31278/276/274/272 - 5V I2C Companion

Rev. 2.1

Sept. 2011

Page 2 of 26

A general-purpose comparator compares an external

input pin to the onboard 1.2V reference. This is

useful for generating a power-fail interrupt (NMI) but

can be used for any purpose. The family also includes

a programmable 64-bit serial number that can be

locked making it unalterable. Additionally it offers a

dual battery-backed event counter that tracks the

number of rising or falling edges detected on

dedicated input pins.

Pin Configuration

Pin Name

Function

CNT1, CNT2

Event Counter Inputs

A0, A1

Device Select inputs

CAL/PFO

Clock Calibration and Early

Power-Fail Output

/RST

Reset Input/Output

PFI

Early Power-fail Input

X1, X2

Crystal Connections

SDA

Serial Data

SCL

Serial Clock

VBAK

Battery-Backup Supply

VDD

Supply Voltage

VSS

Ground

Ordering Information

Base Configuration

Memory Size

Operating Voltage

Reset Threshold

Ordering Part Number

FM31278

256Kb

4.0-5.5V

3.9, 4.4V

FM31278-G

256Kb

4.0-5.5V

3.9, 4.4V

FM31278-GTR (tape&reel)

FM31276

64Kb

4.0-5.5V

3.9, 4.4V

FM31276-G

64Kb

4.0-5.5V

3.9, 4.4V

FM31276-GTR (tape&reel)

FM31274 *

16Kb

4.0-5.5V

3.9, 4.4V

FM31274-G

16Kb

4.0-5.5V

3.9, 4.4V

FM31274-GTR (tape&reel)

FM31272 *

4Kb

4.0-5.5V

3.9, 4.4V

FM31272-G

4Kb

4.0-5.5V

3.9, 4.4V

FM31272-GTR (tape&reel)

* The FM31274 and FM31272 devices are EOL as of Sept. 2011.

VDD

VBAK

SCL

SDA

VSS

X1

X2

CAL/PFO

CNT1

PFI

RST

A0

A1

CNT2

1

2

3

4

5

6

7

14

13

12

11

10

9

8

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FM31278 Datasheet(PDF) 2 Page - Ramtron International Corporation

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