SiTime, Silicon MEMS Oscillators and Clock Generators

SiT1544 Ultra-Small, Ultra-Low Power 1 Hz to 32 kHz Oscillator for Li+ Apps

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ace awards 2014The SiT1544 is the first programmable oscillator capable of a frequency range between 32.768 kHz down to 1 Hz for true pulse-per-second (PPS) operation. The SiT1544 is the world's smallest, lowest power 32 kHz oscillator optimized for unregulated Li+ battery powered applications where the supply voltage must track the Li+ battery voltage from 4.5V down to 2.7V. SiTime's silicon MEMS technology enables the smallest footprint and chip-scale packaging. In the chip-scale package (CSP), these devices reduce footprint by as much as 85% compared to existing 2.0 x 1.2 mm (2012) SMD XTAL packages. In the 2012 package, the SiT1544 is pin-compatible to existing 2012 quartz XTALs. Unlike XTALs, the SiT1544's NanoDrive™ reduced swing oscillator output directly drives an MCU/PMIC/chipset XTAL input while minimizing power.  The oscillator output enables greater component placement flexibility and eliminates external load capacitors, thus saving additional component count and board space.




Frequency Range (Hz)  16 Frequency Options from 1 to 32768 Hz
Frequency Tolerance ±20 PPM
Temp Range (°C) -10 to +70, -40 to +85
Supply Voltage (V) 2.7V to 4.5V
NanoDrive™ Reduced Swing Output 250mV to 1.15V
Package LxWxH (mm) CSP: 1.5 x 0.8 x 0.55, SMD: 2.0 x 1.2 x 0.6
Status Contact Factory
  • Wireless Mouse or Trackball
  • Wireless Keypads
  • Pulse-per-Second (pps) Timekeeping
  • RTC Reference Clock
  • Battery Management Timekeeping

Features Benefits
  • Factory programmable down to 1Hz
  • Significantly reduces power compared to fixed 32.768 kHz XTAL
  • Smallest footrpint in chip-scale (CSP):
    1.5 x 0.8 mm
  • Saves board space by up to 85% compared to the 2012 SMD
  • Small SMD package: 2.0 x 1.2 mm (2012)
  • Pin-compatible to 2012 XTAL SMD
  • Ultra-low power: 900 nA (typ)
  • Extends battery life
  • 2.7V to 4.5V operating supply voltage range
  • Optimized to operate directly from an unregulated Li+ battery
  • NanoDrive™ reduced swing oscillator output
  • Directly interfaces to MCU/PMIC/chipset XTAL IN
  • Programmable output swing minimizes power
  • Oscillator output eliminates load capacitor
  • Internal VDD supply filtering
  • Eliminates external bypass capacitor
  • <100 PPM frequency stability over temperature
  • 2x better stability compared to quartz
  • Improves wireless connectivity and RTC accuracy

Coming Soon
Coming Soon 

 Part number characters in blue represent the customer specific options. The other characters in the part number are fixed.


If you do not know the output voltage requirements to define the proper NanoDrive settings, we recommend the default setting for initial evaluation.

DC-Coupled Receiver
VOH = 1.1V
VOL = 0.4V


Reliability Report
Coming Soon