FM31272(2011) データシートの表示（PDF） - Ramtron International Corporation

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FM31272
(Rev.:2011)

5V Integrated Processor Companion with Memory

Ramtron International Corporation 

Pre-Production

FM31278/FM31276

FM31274/FM31272

5V Integrated Processor Companion with Memory

Features

High Integration Device Replaces Multiple Parts

 Serial Nonvolatile Memory

 Real-time Clock (RTC)

 Low Voltage Reset

 Watchdog Timer

 Early Power-Fail Warning/NMI

 Two 16-bit Event Counters

 Serial Number with Write-lock for Security

Processor Companion

 Active-low Reset Output for VDD and Watchdog

 Programmable VDD Reset Trip Point

 Manual Reset Filtered and Debounced

 Programmable Watchdog Timer

 Dual Battery-backed Event Counter Tracks

System Intrusions or other Events

 Comparator for Early Power-Fail Interrupt

 64-bit Programmable Serial Number with Lock

Ferroelectric Nonvolatile RAM

 4Kb, 16Kb, 64Kb, and 256Kb versions

 Virtually Unlimited Read/Write Endurance

 38 year Data Retention (+75C)

 NoDelay™ Writes

Fast Two-wire Serial Interface

 Up to 1 MHz Maximum Bus Frequency

 Supports Legacy Timing for 100 kHz & 400 kHz

 Device Select Pins for up to 4 Memory Devices

 RTC, Supervisor Controlled via 2-wire Interface

Real-time Clock/Calendar

 Backup Current under 1.4 A

 Seconds through Centuries in BCD format

 Tracks Leap Years through 2099

 Uses Standard 32.768 kHz Crystal (12.5pF)

 Software Calibration

 Supports Battery or Capacitor Backup

Easy to Use Configurations

 Operates from 4.0 to 5.5V

 14-pin “Green”/RoHS SOIC package (-G)

 Low Operating Current

 -40C to +85C Operation

 Underwriters Laboratory (UL) Recognized

Description

The FM3127x is a family of integrated devices that

includes the most commonly needed functions for

processor-based systems. Major features include

nonvolatile memory available in various sizes, real-

time clock, low-VDD reset, watchdog timer,

nonvolatile event counter, lockable 64-bit serial

number area, and general purpose comparator that

can be used for an early power-fail (NMI) interrupt or

other purpose. The family operates from 4.0 to 5.5V.

Each FM3127x provides nonvolatile RAM available

in sizes including 4Kb, 16Kb, 64Kb, and 256Kb

versions. Fast write speed and unlimited endurance

allow the memory to serve as extra RAM or

conventional nonvolatile storage. This memory is

truly nonvolatile rather than battery backed.

calibration mode that allows software adjustment of

timekeeping accuracy.

The processor companion includes commonly needed

CPU support functions. Supervisory functions

include a reset output signal controlled by either a

low VDD condition or a watchdog timeout. /RST

goes active when VDD drops below a programmable

threshold and remains active for 100 ms after VDD

rises above the trip point. A programmable watchdog

timer runs from 100 ms to 3 seconds. The watchdog

timer is optional, but if enabled it will assert the reset

signal for 100 ms if not restarted by the host before

the timeout. A flag-bit indicates the source of the

reset.

The real-time clock (RTC) provides time and date

information in BCD format. It can be permanently

powered from external backup voltage source, either

a battery or a capacitor. The timekeeper uses a

common external 32.768 kHz crystal and provides a

This is a product in pre-production phase of development. Device

characterization is complete and Ramtron does not expect to change

the specifications. Ramtron will issue a Product Change Notice if

any specification changes are made.

Rev. 2.1

Sept. 2011

Ramtron International Corporation

1850 Ramtron Drive, Colorado Springs, CO 80921

(800) 545-FRAM, (719) 481-7000

http://www.ramtron.com

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