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


The SiT1811 is a programmable oscillator with a default frequency of 32.768 kHz. With a no-load current of only 510 nA, the SiT1811 is designed for low-power, space-constrained applications. This device comes in a tiny 1.2 X 1.1 mm QFN package. No external load caps are needed with the SiT1811, resulting in a 75% smaller timing solution compared to 2.0 x 1.2 mm SMD crystals (XTALs). Additionally, the SiT1811 can drive multiple loads up to 100 pf, replacing more than one XTAL and further reducing board space.

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"Specs" "Value"
Frequency 32.768 kHz, Contact SiTime for more
Frequency Stability (ppm) ±20
Operating Temperature Range (°C) 0 to +70, -10 to +85
Package Type (mm²) 1.2x1.1
Phase Jitter (rms) 3 ns (typ.)
Voltage Supply (V) 1.35 to 1.98
Features Low current: 510 nA; Small footprint: 1.32 mm2; Contact SiTime for other frequencies
Availability Production

Ultra-low Power: 510 nA (typ.)

  • Extends battery life

Operates down to 1.35 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

±20 ppm frequency stability over temperature

  • Better stability compared to quartz XTALs

  • Improves wireless connectivity and RTC accuracy
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