Description

The FM31xx 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, realtime 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) interruptor other purpose. The family operates from 2.7 to 5.5V.

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

Ferroelectric Nonvolatile RAM

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

? Virtually Unlimited Read/Write Endurance

? 38 year Data Retention (+75°C)

? NoDelay? Writes

Real-time Clock/Calendar

? Backup Current 1.4 μA

? Seconds through Centuries in BCD format

? Tracks Leap Years through 2099

? Uses Standard 32.768 kHz Crystal (6pF)

? Software Calibration

? Supports Battery or Capacitor Backup

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

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