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Please continue to use the ordering part numbers listed in the datasheet for ordering. www.infineon.comFM31L276/FM31L278 64-Kbit/256-Kbit Integrated Processor Companion with F-RAM 64-Kbit/256-Kbit Integrated Processor Companion with F-RAM Restriction of hazardous substances (RoHS) compliant Features Underwriters laboratory (UL) recognized 64-Kbit/256-Kbit ferroelectric random access memory (F-RAM) Logically organized as 8K 8 (FM31L276)/ Functional Description 32K 8 (FM31L278) 14 High-endurance 100 trillion (10 ) read/writes The FM31L276/FM31L278 device integrates F-RAM memory 151-year data retention (See Data Retention and Endurance with the most commonly needed functions for processor-based on page 29) systems. Major features include nonvolatile memory, real time NoDelay writes clock, low-V reset, watchdog timer, nonvolatile event counter, DD Advanced high-reliability ferroelectric process lockable 64-bit serial number area, and general purpose comparator that can be used for a power-fail (NMI) interrupt or High Integration Device Replaces Multiple Parts any other purpose. Serial nonvolatile memory The FM31L276/FM31L278 is a 64-Kbit/256-Kbit nonvolatile Real time clock (RTC) memory employing an advanced ferroelectric process. A Low voltage reset ferroelectric random access memory or F-RAM is nonvolatile Watchdog timer and performs reads and writes similar to a RAM. This memory is Early power-fail warning/NMI truly nonvolatile rather than battery backed. It provides reliable Two 16-bit event counter data retention for 151 years while eliminating the complexities, Serial number with write-lock for security overhead, and system-level reliability problems caused by other nonvolatile memories. The FM31L276/FM31L278 is capable of Real-time Clock/Calendar 14 supporting 10 read/write cycles, or 100 million times more write Backup current at 2 V: 1.15 A at +25 C cycles than EEPROM. Seconds through centuries in BCD format Tracks leap years through 2099 The real time clock (RTC) provides time and date information in Uses standard 32.768 kHz crystal (6 pF/12.5 pF) BCD format. It can be permanently powered from an external Software calibration backup voltage source, either a battery or a capacitor. The Supports battery or capacitor backup timekeeper uses a common external 32.768 kHz crystal and provides a calibration mode that allows software adjustment of Processor Companion timekeeping accuracy. Active-low reset output for V and watchdog DD Programmable low-V reset trip point DD The processor companion includes commonly needed CPU Manual reset filtered and debounced support functions. Supervisory functions include a reset output Programmable watchdog timer signal controlled by either a low V condition or a watchdog DD Dual Battery-backed event counter tracks system intrusions timeout. RST goes active when V drops below a DD or other events programmable threshold and remains active for 100 ms after Comparator for power-fail interrupt V rises above the trip point. A programmable watchdog timer DD 64-bit programmable serial number with lock runs from 100 ms to 3 seconds. The watchdog timer is optional, 2 but if enabled it will assert the reset signal for 100 ms if not Fast 2-wire serial interface (I C) restarted by the host before the timeout. A flag-bit indicates the Up to 1-MHz frequency source of the reset. Supports legacy timings for 100 kHz and 400 kHz 2 A comparator on PFI compares an external input pin to the RTC, Supervisor controlled via I C interface onboard 1.2 V reference. This is useful for generating a Device select pins for up to 4 memory devices power-fail interrupt (NMI) but can be used for any purpose. The Low power consumption family also includes a programmable 64-bit serial number that 1.5 mA active current at 1 MHz can be locked making it unalterable. Additionally it offers a dual 120 A standby current battery-backed event counter that tracks the number of rising or falling edges detected on a dedicated input pin. Operating voltage: V = 2.7 V to 3.6 V DD For a complete list of related documentation, click here. Industrial temperature: 40 C to +85 C 14-pin small outline integrated circuit (SOIC) package Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600 Document Number: 001-86392 Rev. *D Revised November 19, 2018