Product Summary

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 
? 45 year Data Retention 
? NoDelay? 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 (12.5pF) 
? Software Calibration 
? Supports Battery or Capacitor Backup 

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
FM31L278-G
FM31L278-G
Ramtron
F-RAM 256K w/RTC Pwr Mon WDT Bat Sw PF
Data Sheet
0-1: $4.78
1-10: $4.29
10-50: $3.88
50-100: $3.52
FM31L278-GTR
FM31L278-GTR
Ramtron
F-RAM 256K w/RTC Pwr Mon WDT Bat Sw PF
Data Sheet
0-2500: $2.86