Useful 7in1 Combo

The FM31256 integrates F-RAM memory with the most commonly needed functions for microcontroller-based systems: real-time clock, VDD supervisor, watchdog timer, two event counters, a lockable memory area for the 64-bit serial number, and general-purpose comparator.
This is an archive article published 05/28/2020. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.

256-Kbit F-RAM (ferroelectric RAM) has the endurance of 100 trillion (1014) write cycles, which is 100 million times more than for EEPROM and offers 151-year data retention.

Real-time Clock/Calendar use standard 32,768 kHz crystal manufactured for load capacitance 6pF. SW calibration allows correct frequency deviation up to ±136ppm. The worst-case final accuracy is ±2.17 ppm or ±0.09 minutes per month at the calibrated temperature.
RTC can use 3 or 3,6V primary lithium batteries or supercapacitor as backup power sources. In the case of the supercapacitor, FM31256 provides trickle charging. Backup current is 1,15uA at 2V and 25℃.

If VDD decreases below the pre-programmed threshold, voltage supervisor drives open-drain reset output RSTn to LOW state. The same pin also serves as a manual reset input. When a low input level is detected, the supervisor turns on the RSTn output to the LOW state for 100 ms. RSTn output contains a weak pull-up resistor.

FM31256 also contains:

  • Programmable watchdog timer 
  • Two Battery-backed event counter inputs 
  • General-purpose comparator 
  • Lockable 64-bit programmable serial number

FM31256 operating voltage range is 2.7V to 5.5V that allows the use in 3.3 or 5V powered systems. It communicates with a microcontroller through the I2C interface that supports 100kHz, 400kHz and 1MHz speed.

Please find the FM31256, 256kBit integrated processor companion with F-RAM, in our stock range. For more information, please do not hesitate to contact us at

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Additional products


Integrated Processor Companion + FRAM 256-Kbit

Peripheral Integrated Circuits

Ord. No.: 48390
Manufacturer: CYPRESS
in stock 44 pcs
(09/22/2023: 200 pcs)
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