FM33256B 256-Kbit (32 K 8) Integrated Processor Companion with F-RAM 256-Kbit (32 K 8) Serial (SPI) F-RAM Features Functional Overview 256-Kbit ferroelectric random access memory (F-RAM) The FM33256B device integrates F-RAM memory with the most commonly needed functions for processor-based systems. Logically organized as 32 K 8 14 Major features include nonvolatile memory, real time clock, High-endurance 100 trillion (10 ) read/writes low-V reset, watchdog timer, nonvolatile event counter, DD 151-year data retention (See the Data Retention and lockable 64-bit serial number area, and general purpose Endurance table) comparator that can be used for a power-fail (NMI) interrupt or NoDelay writes any other purpose. Advanced high-reliability ferroelectric process The FM33256B is a 256-Kbit nonvolatile memory employing an High Integration Device Replaces Multiple Parts advanced ferroelectric process. A ferroelectric random access Serial nonvolatile memory memory or F-RAM is nonvolatile and performs reads and writes Real time clock (RTC) with alarm similar to a RAM. It provides reliable data retention for 151 years Low V detection drives reset DD while eliminating the complexities, overhead, and system-level Watchdog window timer reliability problems caused by other nonvolatile memories. The 14 Early power-fail warning / NMI FM33256B is capable of supporting 10 read/write cycles, or 16-bit nonvolatile event counter 100 million times more write cycles than EEPROM. Serial number with write-lock for security The real time clock (RTC) provides time and date information in Real-time Clock/Calendar BCD format. It can be permanently powered from an external Backup current at 2 V: 1.15 A at +25 C backup voltage source, either a battery or a capacitor. The Seconds through centuries in BCD format timekeeper uses a common external 32.768 kHz crystal and Tracks leap years through 2099 provides a calibration mode that allows software adjustment of Uses standard 32.768 kHz crystal (6 pF/12.5 pF) timekeeping accuracy. Software calibration The processor companion includes commonly needed CPU Supports battery or capacitor backup support functions. Supervisory functions include a reset output signal controlled by either a low V condition or a watchdog Processor Companion DD timeout. RST goes active when V drops below a Active-low reset output for V and watchdog DD DD programmable threshold and remains active for 100 ms (max.) Programmable low-V reset thresholds DD after V rises above the trip point. A programmable watchdog Manual reset filtered and debounced DD timer runs from 60 ms to 1.8 seconds. The timer may also be Programmable watchdog window timer programmed for a delayed start, which functions as a window Nonvolatile event counter tracks system intrusions or other events timer. The watchdog timer is optional, but if enabled it will assert Comparator for power-fail interrupt or other use the reset signal for 100 ms if not restarted by the host within the 64-bit programmable serial number with lock time window. A flag-bit indicates the source of the reset. A comparator on PFI compares an external input pin to the Fast serial peripheral interface (SPI) onboard 1.5 V reference. This is useful for generating a Up to 16-MHz frequency power-fail interrupt (NMI) but can be used for any purpose. The RTC, Supervisor controlled via SPI interface family also includes a programmable 64-bit serial number that Supports SPI mode 0 (0, 0) and mode 3 (1, 1) can be locked making it unalterable. Additionally it offers an Low power consumption event counter that tracks the number of rising or falling edges 1.1 mA active current at 1 MHz detected on a dedicated input pin. The counter can be 150 A standby current programmed to be nonvolatile under V power or DD battery-backed using only V . If V is connected to a battery BAK BAK Operating voltage: V = 2.7 V to 3.6 V DD or capacitor, then events will be counted even in the absence of Industrial temperature: 40 C to +85 C V . DD 14-pin small outline integrated circuit (SOIC) package For a complete list of related documentation, click here. Restriction of hazardous substances (RoHS) compliant Underwriters laboratory (UL) recognized Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600 Document Number: 001-86213 Rev. *C Revised August 5, 2015FM33256B Logic Block Diagram Document Number: 001-86213 Rev. *C Page 2 of 39