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Automotive ultra-low power, low-jitter, 32.768 kHz programmable oscillator in 1.2 x 1.1 mm package
LoginSiT1881 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.
Related blog:A small but mighty 32-kHz ultra-low power automotive clock
| "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 | Pre-production Sampling; Contact SiTime for ±20 ppm stability |
Image: 6-pin package, top & bottom
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
- 消除任何外部电容器,进一步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
| Resource Name | Type |
|---|---|
| SiT1881 Datasheet | Datasheets |
| Automotive LiDAR | Application Briefs |
| Driver Monitoring System | Application Briefs |
| Automotive ECU | Application Briefs |
| Automotive Smart Mirrors | Application Briefs |
| PCI Express in Automotive | Application Briefs |
| PCI Express Timing Solutions in Automotive | White Papers |
| Downhole Instrumentation | Application Briefs |
| Autonomous Ground Vehicles | Application Briefs |
| NVIDIA DRIVE Orin Reference Design | Application Briefs |
