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FM32256-S

製品説明
仕様・特性

Pre-Production FM3204/16/64/256 Integrated Processor Companion with Memory Features High Integration Device Replaces Multiple Parts • Serial Nonvolatile Memory • Low Voltage Reset • Watchdog Timer • Early Power-Fail Warning/NMI • Two 16-bit Event Counters • Serial Number with Write-lock for Security 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 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, lowVDD 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. 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. 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. Ferroelectric Nonvolatile RAM • 4Kb, 16Kb, 64Kb, and 256Kb versions • Unlimited Read/Write Endurance • 10 year Data Retention • NoDelay™ Writes 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 • Companion Controlled via 2-wire Interface Easy to Use Configurations • Operates from 2.7 to 5.5V • Small Footprint 14-pin SOIC (-S) o “Green” 14-pin SOIC (-G) • 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. 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. 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 absence of VDD. 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. Rev 2.1 Dec. 2004 Ramtron International Corporation 1850 Ramtron Drive, Colorado Springs, CO 80921 (800) 545-FRAM, (719) 481-7000 www.ramtron.com Page 1 of 20

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