Automotive ultra-low power, low-jitter, 32.768 kHz programmable oscillator in 1.2 x 1.1 mm package


SiT1881 is an ultra-low power automotive-qualified 32-kHz oscillator (XO), designed for ±50 ppm operation up to 105°C. It is a programmable oscillator with a default frequency of 32.768 kHz with the ability to support 17 other frequencies from 1 Hz to 262.144 kHz. The SiT1881 XO is SiTime’s lowest power XO with a no-load current of only 490 nA. Furthermore, it eliminates any requirement for load capacitors and comes in a small 1.2 X 1.1 mm QFN package. This enables up to 75% smaller footprint compared to 2.0 x 1.2 mm SMD crystal. The SiT1881 can drive up to 100 pf of load, which provides additional system savings by eliminating multiple 32.768 kHz crystals in a design. This device also introduces an innovative new Reduced Swing technology to further minimize overall system power.

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6-pin Atna
"Specs" "Value"
Frequency 32.768 kHz, 1 Hz to 262.14 kHz
Frequency Stability (ppm) ±50, ±100
Phase Jitter (rms) 3 ns (typ.)
Output Type LVCMOS, Reduced Swing
Operating Temperature Range (°C) -40 to 105
Voltage Supply (V) 1.14 to 1.35, 1.35 to 1.98
Package Type (mm²) 1.2x1.1
Features Low current: 490 nA; Small footprint: 1.32 mm2; AEC-Q100
Availability Engineering Samples; Contact SiTime for ±20 ppm stability

Factory programmable down to 1 Hz

  • Significantly reduces power compared to fixed 32.768 kHz XTALs

Ultra-low Power: 490 nA (typ.)

  • Extends battery life

Operates down to 1.14 V

  • Supports coin-cell or supercap battery backup

Reduced Swing technology

  • Programmable output swing down to 0.6 V minimizes power

Small footprint: 1.2 x 1.1 mm

  • Saves board space compared to the 2012 SMD XTALs

Drives multiple loads up to 100 pf

  • One SiT1811 can replace multiple quartz XTALs

No load or VDD filtering capacitors

  • Eliminates any external capacitors, further reducing board space
  • Eliminates load-dependent startup issues

±50 ppm frequency stability over -40 °C to +105 °C temp. range

  • Better stability compared to quartz XTALs
  • Improves wireless connectivity and RTC accuracy
    • ADAS ECU
    • Infotainment
    • Smart mirror
    • Industrial applications

    Time Machine II Programmer – Program frequency, voltage, and stability - coming soon

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