Pre-Production
FM3204/16/64/256
Integrated Processor Companion with Memory
Features
High Integration Device Replaces Multiple Parts
Ferroelectric Nonvolatile RAM
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Serial Nonvolatile Memory
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4Kb, 16Kb, 64Kb, and 256Kb versions
Unlimited Read/Write Endurance
10 year Data Retention
Low Voltage Reset
Watchdog Timer
Early Power-Fail Warning/NMI
Two 16-bit Event Counters
Serial Number with Write-lock for Security
NoDelay™ Writes
Fast Two-wire Serial Interface
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Up to 1 MHz Maximum Bus Frequency
Supports Legacy Timing for 100 kHz & 400 kHz
Device Select Pins for up to 4 Memory Devices
Companion Controlled via 2-wire Interface
Processor Companion
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Active-low Reset Output for VDD and Watchdog
Programmable VDD Reset Trip Point
Manual Reset Filtered and Debounced
Programmable Watchdog Timer
Easy to Use Configurations
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Operates from 2.7 to 5.5V
Dual Battery-backed Event Counter Tracks
System Intrusions or other Events
Small Footprint 14-pin SOIC (-S)
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“Green” 14-pin SOIC (-G)
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Comparator for Early Power-Fail Interrupt
64-bit Programmable Serial Number with Lock
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Pin Compatible with FM31xx Series
Low Operating Current
-40°C to +85°C Operation
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.
Description
The FM32xx 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, low-
V
DD 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 5.5V.
A general-purpose comparator compares an external
input pin to the onboard 1.2V reference. This is
useful for generating an early warning 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.
The FM32xx family is software and pinout
compatible with the FM31xx family which also
includes a real-time clock. The common features
allow a system design that easily can be assembled
with or without timekeeping by simply selecting the
FM31xx or FM32xx, respectively.
Additionally the FM32xx offers a dual event counter
that tracks the number of rising or falling edges
detected on dedicated input pins. The counter can
optionally be battery backed and even battery
operated by attaching a backup power source to the
VBAK pin. If VBAK is connected to a battery or
capacitor, then events will be counted even in the
Each FM32xx 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.
absence of VDD
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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
This is a product in pre-production phase of development. Device
characterization is complete and Ramtron does not expect to change
the specifications. Ramtron will issue a Product Change Notice if
any specification changes are made.
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
www.ramtron.com
Rev 2.1
Dec. 2004
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