SiTime clock generators are engineered to deliver high performance and the highest level of clock tree integration by consolidating multiple clock ICs into a single device. Our Cascade™ and Chorus™ MEMS-based clocks take integration a step further by integrating a SiTime resonator inside the clock, eliminating the need for the quartz crystal reference required by traditional clocks.
![Cascade Platform MEMS-based Clock Generator Package](/sites/default/files/productcats/cascade-clock-IC-package-sm._3.jpg)
MEMS Clock Generators
SiTime MEMS-based clock generators feature up to 4 independent Frac-N PLLs, wide frequency range, low jitter and a rich set of programmable features. By integrating the MEMS resonator, the need for a quartz crystal time reference is eliminated, along with all performance, design, quality and reliability issues associated with traditional quartz-based devices.
- Up to 50% less board space
- Always-accurate clock synthesis by eliminating crystal capacitive mismatch
- Always-reliable startup even at cold temperature and in other harsh environmental conditions
- No jitter degradation because of noise coupling onto a crystal interface
- No activity dips/frequency jumps inherent with quartz
- 10x more resistant to vibration and board bending
Device | Datasheet | Buy Now | Number of Inputs | Number of Outputs | Max. Output Frequency | Number of PLL/Clock Domains | Phase Jitter(rms) | Package(mm) |
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SiT91211 |
|
8 single-ended 4 differential | 1 PLL | 150 fs (typ.) | 4x4 mm, 24-pin QFN | |||
SiT91213 |
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8 single-ended 4 differential | 1 PLL | 70 fs (typ.) | 4x4 mm, 24-pin QFN | |||
SiT95141 |
|
4 | 10 | 2.1 GHz | 4 PLL 1 time domain | 120 fs | 9x9 mm, 64-pin QFN |
![44-pin 7x7 mm QFN Clock Generators - Network Synchronizers - Jitter Cleaners package](/sites/default/files/products/44-pin-7x7mm-Cascade2-NS-JC-%28Angled%29-small.png)
Clock Generators
These clock generators feature 4 independent quad fractional PLLs, 4 inputs, up to 12 outputs, wide frequency range from 200 kHz to 2.1 GHz, and a rich set of programmable features in small QFN packages.
- Low 85 fs integrated jitter minimizes bit error rate and increases design margin
- Always-reliable startup even at cold temperature and in other harsh environmental conditions
- When combined with a MEMS oscillator, quartz-related issues are eliminated including jitter degradation because of noise coupling onto a crystal interface, activity dips/frequency jumps and vibration sensitivity
Device | Datasheet | Buy Now | Number of Inputs | Number of Outputs | Max. Output Frequency | Number of PLL/Clock Domains | Phase Jitter(rms) | Package(mm) |
---|---|---|---|---|---|---|---|---|
SiT95210 |
|
4 | 4 | 2.94912 GHz | 4 PLL | 85 fs typ.; 70 fs typ. (with MEMS oscillator) | 7x7 mm, 44-pin QFN | |
SiT95211 |
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4 | 12 | 2.94912 GHz | 4 PLL | 85 fs typ.; 70 fs typ. (with MEMS oscillator) | 9x9 mm, 64-pin QFN |
![3x3 mm, 12-pin DFN Real Time Clock (RTC) package](/sites/default/files/images/12-pin-3x3mm-RTC-Angled.png)
Real-time Clock
SiTime’s real-time clock (RTC) and calendar device offers dual I2C bus support that allows access for two master devices, such as a CPU and BMC chip. The RTC is optimized for ultra-low power consumption and has a built-in voltage-level detection circuit that detects power status and voltage level.
- Provides year, month, day, weekday, hours, minutes and seconds based on a 32.768 kHz MEMS oscillator or quartz crystal
- Support daylight saving mode, leap-year compensation, selectable 24-hour and 12-hour mode
- Automatic power-level detect and switch circuitry, automatically switches to the backup battery power supply (VBAT) and continues operation with very low current
Device | Datasheet | Buy Now | Number of Inputs | Number of Outputs | Max. Output Frequency | Number of PLL/Clock Domains | Phase Jitter(rms) | Package(mm) |
---|---|---|---|---|---|---|---|---|
SiT95901 |
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1 | 1 | 1 Hz | n/a | n/a | 3x3 mm, 12-pin DFN |