SiTime, Silicon MEMS Oscillators and Clock Generators

SiT1543 Ultra-Low Power 32 kHz XTAL Replacement for Li+ Apps

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ace awards 2014The SiT1543 is an XTAL compatible, ultra-low power 32.768 kHz oscillator optimized for unregulated Li+ battery powered applications where the supply voltage must track the Li+ battery voltage from 4.3V down to 2.7V. The SiT1543 is pin-compatible and footprint compatible to existing 2012 XTALs when using the SiTime solder-pad layout (SPL). Unlike quartz XTALs, the SiT1543's NanoDrive™ reduced swing oscillator output is designed to directly drive MCU/PMIC/Chipset XTAL inputs with minimum power.  In addition, the oscillator output is insensitive to load cpacitance and, therefore, does not require external load capacitors and enables greater component placement flexibility than passive XTALs. 




Frequency Range (kHz) 32.768
Frequency Tolerance 20 PPM
Temp Range (°C) -10 to +70, -40 to +85
Supply Voltage (V) 2.7V – 4.5V
NanoDrive™ Reduced Swing Output 250mV to 1.15V
Package LxWxH (mm) 2.0 x 1.2 x 0.6
Status Contact Factory
  • Smartphones
  • Tablets
  • e-Readers
  • Health and Wellness Monitors
  • Fitness Watches
  • Sport Video Camcorders
  • Wireless Keypads
  • Wireless Mouse Devices
  • Battery Management Timekeeping

Features Benefits
  • Small SMD package: 2.0 x 1.2mm (2012)
  • Pin-compatible to 2012 XTAL SMD
  • Ultra-low power: 900nA (typ)
  • Extends battery life
  • NanoDrive™ reduced swing oscillator output
  • Directly drives into MCU/PMIC/Chipset XTAL IN
  • Programmable swing minimizes power
  • Oscillator output is insensitive to load and operates with or without load capacitors
  • No load or Vdd filtering capacitors
  • Eliminates all external capacitors
  • Eliminates load-dependent start-up issues common with quartz XTALs
  • 2.7V – 4.5V operating supply voltage range
  • Optimized to operate directly from an unregulated Li+ battery
  • <100 PPM frequency stability over -40°C to +85°C temp range
  • 2x better stability than quartz XTAL
  • Improves system 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