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FM32L278 Datasheet(PDF) 1 Page - Ramtron International Corporation |
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FM32L278 Datasheet(HTML) 1 Page - Ramtron International Corporation |
1 / 21 page This product conforms to specifications per the terms of the Ramtron Ramtron International Corporation standard warranty. The product has completed Ramtron’s internal 1850 Ramtron Drive, Colorado Springs, CO 80921 qualification testing and has reached production status. (800) 545-FRAM, (719) 481-7000 http://www.ramtron.com Rev. 3.0 Feb. 2009 Page 1 of 21 FM32L278/L276/L274/L272 3V 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 Ferroelectric Nonvolatile RAM • 4Kb, 16Kb, 64Kb, and 256Kb versions • Unlimited Read/Write Endurance • 45 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 3.6V • 14-pin “Green”/RoHS SOIC package (-G) • Pin Compatible with FM31L27x Series • Low Operating Current • -40 °C to +85°C Operation • Underwriters Laboratory (UL) Recognized Description The FM32L27x 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- 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. The FM32L27x family is software and pinout compatible with the FM31L27x 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 FM31L27x or FM32L27x, respectively. Each FM32L27x 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 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 general-purpose comparator compares an external input pin to the onboard 1.2V 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 the FM32L27x 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. |
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