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