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FM31L278 데이터시트(PDF) 1 Page - Ramtron International Corporation

부품명 FM31L278
상세설명  3V Integrated Processor Companion with Memory
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제조업체  RAMTRON [Ramtron International Corporation]
홈페이지  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM31L278 데이터시트(HTML) 1 Page - Ramtron International Corporation

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Pre-Production
This is a product in pre-production phase of development. Device
Ramtron International Corporation
characterization is complete and Ramtron does not expect to change
1850 Ramtron Drive, Colorado Springs, CO 80921
the specifications. Ramtron will issue a Product Change Notice if
(800) 545-FRAM, (719) 481-7000
any specification changes are made.
http://www.ramtron.com
Rev. 2.1
Sept. 2011
Page 1 of 26
FM31L278/FM31L276
FM31L274/FM31L272
3V Integrated Processor Companion with Memory
Features
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 Counters
Serial Number with Write-lock for Security
Ferroelectric Nonvolatile RAM
4Kb, 16Kb, 64Kb, and 256Kb versions
Virtually Unlimited Read/Write Endurance
38 year Data Retention (+75C)
NoDelay™ Writes
Real-time Clock/Calendar
Backup Current under 1.4 A
Seconds through Centuries in BCD format
Tracks Leap Years through 2099
Uses Standard 32.768 kHz Crystal (12.5pF)
Software Calibration
Supports Battery or Capacitor Backup
Processor Companion
Active-low Reset Output for VDD and Watchdog
Programmable 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 Early Power-Fail Interrupt
64-bit Programmable Serial Number with Lock
Fast Two-wire Serial Interface
Up to 1 MHz Maximum Bus Frequency
Supports Legacy Timing for 100 kHz & 400 kHz
Device Select Pins for up to 4 Memory Devices
RTC, Supervisor Controlled via 2-wire Interface
Easy to Use Configurations
Operates from 2.7 to 3.6V
14-pin “Green”/RoHS SOIC package (-G)
Low Operating Current
-40C to +85C Operation
Underwriters Laboratory (UL) Recognized
Description
The FM31L27x is a family of integrated devices that
includes the most commonly needed functions for
processor-based systems. Major features include
nonvolatile memory available in various sizes, 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 an early power-fail (NMI) interrupt or
other purpose. The family operates from 2.7 to 3.6V.
Each
FM31L27x
provides
nonvolatile
RAM
available in sizes including 4Kb, 16Kb, 64Kb, and
256Kb versions. Fast write speed and unlimited
endurance allow the memory to serve as extra RAM
or conventional nonvolatile storage. This memory is
truly nonvolatile rather than battery backed.
The real-time clock (RTC) provides time and date
information in BCD format. It can be permanently
powered from 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.


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