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A tuning fork oscillator IC for 32.768 kHz output, operating over a wide supply range of 1.2 to 5.5 volts with typical no load current consumption of 1µA! The 5091 features a frequency adjustment programmable via a 3-wire interface and on-board EEPROM. Operating temperature range is -40°C to 85°C

Packages for 5091

Size (mm)PackageHeight
w/o lid (mm)
PadsD/A connectionLayout TypeLidStepped Lid
7.0x5.0PDFS5070DCK81.56VSSPDFLDK5070-4-10NPDFLDSL5070-5-10K PDFLDSL5070-5-11K


Key Features

  • Tuning Fork oscillation at 32.768 kHz
  • Low current consumption 1µA typical at 3.3 Volts, no load
  • CMOS input and output
  • Tuning Fork stability (typically +10-180ppm)
  • frequency adjustment using onboard EEPROM and 3-wire serial interface
  • Operating supply voltage range: 1.2V to 5.5V
  • Package: Wafer form, Chip form
  • -40 to +85°C operating temperature range


  • Real time clock application with settable 32.768 kHz output
  • Time keeping
  • Industrial
  • Remote equipment installations
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