Description
The FM3135 integrates a real-time clock (RTC) and F-RAM nonvolatile memory. The 32.768kHz crystal is embedded inside the package. The device operates from 2.7 to 3.6V.

FEATUREs
High Integration Device Replaces Multiple Parts
• Serial Nonvolatile Memory
• Real-time Clock (RTC) with Alarm
• Clock Output (Programmable frequency)

64Kb Ferroelectric Nonvolatile RAM
• Internally Organized as 8Kx8
• Unlimited Read/Write Endurance
• 45 year Data Retention
• NoDelay™ Writes

Fast Two-wire Serial Interface
• Up to 1 MHz Maximum Bus Frequency
• Supports Legacy Timing for 100 kHz & 400 kHz
• RTC & F-RAM Controlled via 2-wire Interface

Real-time Clock/Calendar
• Embedded 32.768 kHz Crystal
• Backup Current under 1 µA
• Seconds through Centuries in BCD format
• Tracks Leap Years through 2099
• Software Calibration
• Supports Battery or Capacitor Backup

Easy to Use Configurations
• Operates from 2.7 to 3.6V
• 20-pin “Green”/RoHS SOIC (-G)
• Low Operating Current
• Industrial Temperature -40°C to +85°C
• Underwriters Laboratory (UL) Recognized