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FM31T372 データシート(PDF) 1 Page - Ramtron International Corporation |
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FM31T372 データシート(HTML) 1 Page - Ramtron International Corporation |
1 / 26 page Preliminary This is a product that has fixed target specifications but are subject Ramtron International Corporation to change pending characterization results. 1850 Ramtron Drive, Colorado Springs, CO 80921 (800) 545-FRAM, (719) 481-7000 Rev. 1.1 http://www.ramtron.com Apr. 2011 Page 1 of 26 FM31T372/374/376/378 System Supervisor & Temperature Compensated RTC (TCXO) with Embedded Crystal Features High Integration Device Replaces Multiple Parts Real-time Clock (RTC) o Embedded 32.768kHz Crystal o Temperature Compensated 32.768 kHz Clock Output Low-VDD Detection Drives Reset Watchdog Timer Early Power-Fail Warning/NMI Two 16-bit Event Counters with Event Driven Interrupt Output Serial Number with Write-lock for Security Ferroelectric Nonvolatile RAM 4Kb, 16Kb, 64Kb, and 256Kb versions Unlimited Read/Write Endurance 10 year Data Retention NoDelay™ Writes Real-time Clock/Calendar Temp-Compensated Using On-Chip Sensor o 5 ppm over -40°C to +85°C o Accuracy 2 ½ min. per year Backup Current 1.4 A (max.) at +25C Seconds through Centuries in BCD format Tracks Leap Years through 2099 No External Crystal Required Offset Register to Correct for Crystal Aging Supports Battery or Capacitor Backup Processor Companion 32.768 kHz Clock Output 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 Event Counter Driven Interrupt Output 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 5.5V Small Footprint 14-pin “Green” SOIC (-G) Low Operating Current -40C to +85C Operation Description The FM31T37x is a family of integrated devices that includes the most commonly needed functions for processor-based systems. Major features include nonvolatile F-RAM memory available in various sizes, temperature-compensated real-time clock with embedded crystal, 32.768kHz clock output, low-VDD reset, watchdog timer, battery backed event counter, event driven interrupt output, lockable 64-bit serial number area, general purpose comparator that can be used for an early power-fail (NMI) interrupt or other purpose, and 2-wire serial interface to a host microcontroller. The family operates from 2.7 to 5.5V. 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 an internal 32.768 kHz crystal which is factory- calibrated for excellent timekeeping accuracy over the industrial temperature range. The FM31T37x devices integrate 4Kb, 16Kb, 64Kb, and 256Kb of F-RAM memory. F-RAM offers superior write speed and unlimited endurance. This allows the memory to provide system data collection and as read/write RAM 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. |
同様の部品番号 - FM31T372 |
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同様の説明 - FM31T372 |
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