●Description
●The FM31xxx 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) interrupt or 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
●• Unlimited Read/Write Endurance
●• 10 year Data Retention
●• NoDelayô Writes
●Real-time Clock/Calendar
●• Backup Current under 1 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 VDDand Watchdog
●• Programmable VDDReset Trip Point
●• Manual Reset Filtered and De-bounced
●• 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 SOIC
●• Low Operating Current
●• -40°C to +85°C Operation
