AN402 - F-RAM RTC Oscillator Guide

Introduction

FM31xxx and FM33xxx are Integrated Processor Companion devices that feature nonvolatile F-RAM memory and a real-time clock or RTC.  The RTC operates on VDD power and switches to a backup supply when the VDD power is removed. Under backup power, the RTC draws very little current, which allows a long operating time. This application note focuses on the RTC oscillator and provides design considerations for a system designer using these devices.