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Cypress Semiconductor Electronic Components Datasheet

FM31278 Datasheet

64-Kbit/256-Kbit Integrated Processor Companion

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FM31276/FM31278
64-Kbit/256-Kbit Integrated Processor
Companion with F-RAM
256-Kbit (32 K × 8) Serial (SPI) F-RAM
Features
64-Kbit/256-Kbit ferroelectric random access memory (F-RAM)
Logically organized as 8 K × 8 (FM31276) / 32 K × 8
(FM31278)
High-endurance 100 trillion (1014) read/writes
151-year data retention (See the Data Retention and
Endurance table)
NoDelay™ writes
Advanced high-reliability ferroelectric process
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 counter
Serial number with write-lock for security
Real-time Clock/Calendar
Backup current at 2 V: 1.15 A at +25 C
Seconds through centuries in BCD format
Tracks leap years through 2099
Uses standard 32.768 kHz crystal (6 pF/12.5 pF)
Software calibration
Supports battery or capacitor backup
Processor Companion
Active-low reset output for VDD and watchdog
Programmable low-VDD reset trip point
Manual reset filtered and debounced
Programmable watchdog timer
Dual Battery-backed event counter tracks system intrusions
or other events
Comparator for power-fail interrupt
64-bit programmable serial number with lock
Fast 2-wire serial interface (I2C)
Up to 1-MHz frequency
Supports legacy timings for 100 kHz and 400 kHz
RTC, Supervisor controlled via I2C interface
Device select pins for up to 4 memory devices
Low power consumption
1.5 mA active current at 1 MHz
150 A standby current
Operating voltage: VDD = 4.0 V to 5.5 V
Industrial temperature: –40 C to +85 C
14-pin small outline integrated circuit (SOIC) package
Restriction of hazardous substances (RoHS) compliant
Underwriters laboratory (UL) recognized
Functional Overview
The FM31276/FM31278 device integrates F-RAM memory with
the most commonly needed functions for processor-based
systems. Major features include nonvolatile memory, real time
clock, low-VDD reset, watchdog timer, nonvolatile event counter,
lockable 64-bit serial number area, and general purpose
comparator that can be used for a power-fail (NMI) interrupt or
any other purpose.
The FM31276/FM31278 is a 64-Kbit/256-Kbit nonvolatile
memory employing an advanced ferroelectric process. A
ferroelectric random access memory or F-RAM is nonvolatile
and performs reads and writes similar to a RAM. This memory is
truly nonvolatile rather than battery backed. It provides reliable
data retention for 151 years while eliminating the complexities,
overhead, and system-level reliability problems caused by other
nonvolatile memories. The FM31276/FM31278 is capable of
supporting 1014 read/write cycles, or 100 million times more write
cycles than EEPROM.
The real time clock (RTC) provides time and date information in
BCD format. It can be permanently powered from an external
backup voltage source, either a battery or a capacitor. The
timekeeper uses a common external 32.768 kHz crystal and
provides a calibration mode that allows software adjustment of
timekeeping accuracy.
The processor companion includes commonly needed CPU
support functions. Supervisory functions include a reset output
signal controlled by either a low VDD condition or a watchdog
timeout. RST goes active when VDD drops below a
programmable threshold and remains active for 100 ms after
VDD rises above the trip point. A programmable watchdog timer
runs from 100 ms to 3 seconds. The watchdog timer is optional,
but if enabled it will assert the reset signal for 100 ms if not
restarted by the host before the timeout. A flag-bit indicates the
source of the reset.
A comparator on PFI compares an external input pin to the
onboard 1.2 V reference. This is useful for generating a
power-fail interrupt (NMI) but can be used for any purpose. The
family also includes a programmable 64-bit serial number that
can be locked making it unalterable. Additionally it offers a dual
battery-backed event counter that tracks the number of rising or
falling edges detected on a dedicated input pin.
For a complete list of related documentation, click here.
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 001-86393 Rev. *D
• San Jose, CA 95134-1709 • 408-943-2600
Revised November 5, 2014


Cypress Semiconductor Electronic Components Datasheet

FM31278 Datasheet

64-Kbit/256-Kbit Integrated Processor Companion

No Preview Available !

Logic Block Diagram
FM31276/FM31278
Document Number: 001-86393 Rev. *D
Page 2 of 33


Part Number FM31278
Description 64-Kbit/256-Kbit Integrated Processor Companion
Maker Cypress Semiconductor
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FM31278 Datasheet PDF






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