FM3135 Datasheet | Ramtron

.Data Sheet.co.kr Preliminary Integrated RTC/Alarm/F-RAM & Embedded Crystal Features High Integration Device Replaces Multiple Parts - Serial Nonvolatile Memory - Real-time Clock (RTC) with Alarm - Clock Output (Programmable frequency) 64Kb Ferroelectric Nonvolatile RAM - Internally Organized as 8Kx8 - Unlimited Read/Write Endurance - 45 year Data Retention - No Delay™ Writes Fast Two-wire Serial Interface - Up to 1 MHz Maximum Bus Frequency - Supports Legacy Timing for 100 k Hz & 400 k Hz - RTC & F-RAM Controlled via 2-wire Interface Real-time Clock/Calendar - Embedded 32.768 k Hz Crystal - Backup Current under 1 µA - Seconds through Centuries in BCD format - Tracks Leap Years through 2099 - Software Calibration - Supports Battery or Capacitor Backup Easy to Use Configurations - Operates from 2.7 to 3.6V - 20-pin “Green”/Ro HS SOIC (-G) - Low Operating Current - Industrial Temperature -40°C to +85°C - Underwriters Laboratory (UL) Recognized Description The FM3135 integrates a real-time clock (RTC) and F-RAM nonvolatile memory. The 32.768k Hz crystal is embedded inside the package. The device operates from 2.7 to 3.6V. The FM3135 provides nonvolatile F-RAM which Features fast write speed and unlimited endurance. This allows the memory to serve as extra RAM for the system microcontroller 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 crystal integral to the package and provides a calibration mode that allows software adjustment of timekeeping accuracy. Pin Configuration NC NC ACS VDD NC NC NC NC NC NC 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12...