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 sales@soselectronic.com.
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