FM31T372 datasheet(2/26 Pages) RAMTRON

2 / 26 page

FM31T372/374/376/378-G

Rev. 1.1

Apr. 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

VSS

Ground

VBAK

Battery-Backup Supply

PFI

Early Power-fail Input

/INT

Event Counter Driven Interrupt

Output

FOUT

32.768 kHz Clock Output

SDA

Serial Data

SCL

Serial Clock

VDD

Supply Voltage

Ordering Information

Base Configuration

Memory Size

Operating Voltage

Reset Threshold

Ordering Part Number

FM31T378

256Kb

2.7-5.5V

2.6V, 2.9, 3.9, 4.4V

FM31T378-G

FM31T376

64Kb

2.7-5.5V

2.6V, 2.9, 3.9, 4.4V

FM31T376-G

FM31T374

16Kb

2.7-5.5V

2.6V, 2.9, 3.9, 4.4V

FM31T374-G

FM31T372

4Kb

2.7-5.5V

2.6V, 2.9, 3.9, 4.4V

FM31T372-G

VDD

VBAK

SCL

SDA

VSS

/INT

FOUT

CAL/PFO

CNT1

PFI

RST

CNT2

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