Description

The FM31276-G is an integrated device belonging to the FM3127x family that comes with all the necessary functions required for processor-based systems. The device has various features, such as nonvolatile memory available in diverse sizes, a real-time clock, a low-VDD reset, a watchdog timer, a nonvolatile event counter, a lockable 64-bit serial number area, and a general-purpose comparator that can be used for an early power-fail interrupt (NMI) or other purpose. The family operates from 4.0 to 5.5V.

Specifications and features

• 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 under 1.4 μA
• 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

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 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

Application Scenarios

The FM31276-G can be used in various electronics devices where microprocessor-based functions are required. Its high integration feature and diverse non-volatile memory sizes make it compatible for use in sectors that require secure data storage and reliability.

Comparison

• The diverse sizes of the nonvolatile memory making it compatible for various sectors.
• Can be operated from 4.0 to 5.5V
• Uses standard 32.768 kHz crystal for real-time clock/calendar
• Includes a watchdog timer to monitor system operations and identify malfunctions

• The device uses only 14-pin SOIC package for mounting
• The device is not cost-effective when only basic functions are needed