FM31T374 datasheet, PDF - EEWORLD Datasheet

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FM31T374: Description1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14; Categoryaccessories; File Size580KB，26 Pages; ManufacturerRamtron International Corporation (Cypress Semiconductor Corporation); Websitehttp://www.cypress.com/

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FM31T374 Overview

1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14

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Preliminary

FM31T372/374/376/378

System Supervisor & Temperature Compensated RTC

(TCXO) with Embedded Crystal

Features

High Integration Device Replaces Multiple Parts



Real-time Clock (RTC)

Embedded 32.768kHz Crystal

Temperature Compensated



32.768 kHz Clock Output



Low-V

Detection Drives Reset



Watchdog Timer



Early Power-Fail Warning/NMI



Two 16-bit Event Counters with Event Driven

Interrupt Output



Serial Number with Write-lock for Security

Ferroelectric Nonvolatile RAM



4Kb, 16Kb, 64Kb, and 256Kb versions



Unlimited Read/Write Endurance



10 year Data Retention



NoDelay™ Writes

Real-time Clock/Calendar



Temp-Compensated Using On-Chip Sensor



5 ppm over -40°C to +85°C

Accuracy



2 ½ min. per year



Backup Current 1.4

A

(max.) at +25C



Seconds through Centuries in BCD format



Tracks Leap Years through 2099



No External Crystal Required

Offset Register to Correct for Crystal Aging

Supports Battery or Capacitor Backup

Processor Companion



32.768 kHz Clock Output



Active-low Reset Output for V

and Watchdog



Programmable V

Reset Trip Point



Manual Reset Filtered and Debounced



Programmable Watchdog Timer



Dual Battery-backed Event Counter Tracks

System Intrusions or other Events



Event Counter Driven Interrupt Output



Comparator for Early Power-Fail Interrupt



64-bit Programmable Serial Number with Lock

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

Easy to Use Configurations



Operates from 2.7 to 5.5V



Small Footprint 14-pin “Green” SOIC (-G)



Low Operating Current



-40C to +85C Operation

Description

The FM31T37x is a family of integrated devices that

includes the most commonly needed functions for

processor-based systems. Major features include

nonvolatile F-RAM memory available in various

sizes, temperature-compensated real-time clock with

embedded crystal, 32.768kHz clock output,

low-VDD reset, watchdog timer, battery backed

event counter, event driven interrupt output, lockable

64-bit serial number area, general purpose

comparator that can be used for an early power-fail

(NMI) interrupt or other purpose, and 2-wire serial

interface to a host microcontroller. The family

operates from 2.7 to 5.5V.

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 an

internal 32.768 kHz crystal which is factory-

calibrated for excellent timekeeping accuracy over

the industrial temperature range.

This is a product that has fixed target specifications but are subject

to change pending characterization results.

Rev. 1.1

Apr. 2011

The FM31T37x devices integrate 4Kb, 16Kb, 64Kb,

and 256Kb of F-RAM memory. F-RAM offers

superior write speed and unlimited endurance. This

allows the memory to provide system data collection

and as read/write RAM storage. This memory is truly

nonvolatile rather than battery-backed.

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.

Ramtron International Corporation

1850 Ramtron Drive, Colorado Springs, CO 80921

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

http://www.ramtron.com

Page 1 of 26

FM31T374 Related Products

	FM31T374	FM31T372	FM31T372-G	FM31T376	FM31T376-G	FM31T378-G
Description	1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14	1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14	1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14	1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14	1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14	1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14

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