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FM31L278 데이터시트(PDF) 1 Page - Ramtron International Corporation |
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FM31L278 데이터시트(HTML) 1 Page - Ramtron International Corporation |
1 / 26 page 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 (+75C) 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 -40C to +85C 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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