The Chorus™ SiT91285 is a programmable, high-performance automotive grade clock generator engineered for PCI Express Generation 1 to 5 and Ethernet applications where reliability and environmental robustness are critical. It can be configured to provide up to four 100 MHz, 125 MHz, 156.25MHz differential outputs. Additionally, one or more outputs can also be configured to provide LVCMOS clock references at commonly used frequencies in automotive applications.
The SiT91285 integrates SiTime’s MEMS resonator, eliminating the need for an external oscillator or resonator. This integrated MEMS improves system reliability by eliminating traditional clock generators’ dependence on quartz and its associated issues like high failure rates and matching requirements.
The device can be configured to provide common output frequencies with differential outputs (HCSL/LP-HCSL) or single-ended outputs (LVCMOS). The outputs can have separate power rails and output enables (OE).
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| "Specs" | "Value" |
|---|---|
| Frequency Stability (ppm) | ±50 ppm (-40°C to 125°C) |
| Operating Temperature Range (°C) | -40 to 105, -40 to 125 |
| Package Type (mm²) | 4x4 mm, 24-pin QFN |
| Number of Outputs | 8 single-ended, 4 differential |
| Output Type | LVCMOS, HCSL, LPHCSL |
| Output Frequency Range | Configurable output frequencies: 24, 25, 38.4, 40, 48, 50, 100, 125, 156.25 MHz |
| Phase Jitter (rms) | 200 fs (typ.) |
| PCIe Support | Gen 1 to Gen 5 |
| Voltage Supply (V) | 1.8, 2.5, 3.3 |
| Availability | Sampling |
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4x4 mm, 24-pin QFN Clock Generator package
- Configurable output frequencies for PCIe, Ethernet and other common use cases:
- 24, 25, 27, 38.4, 40, 48, 50, 100, 125 MHz
- Fully integrated MEMS-based clock source
- Configurable clock domain with up to 4 HCSL/LPHCSL outputs and/or up to 8 LVCMOS outputs
- AEC-Q100 Grade 1, -40°C to 125°C
- Excellent frequency stability:
- ±50 ppm (-40°C to 125°C)
- Clock fault monitors (Loss of Lock, Loss of MEMS clock)
- Supply voltage of 1.8 V to 3.3 V
- Configurable spread-spectrum clock generation
- Low phase jitter, 300 fs maximum (12 kHz-20 MHz)
- PCIe Gen 1 to 5 compliant
- Resistant to shock/vibration
- QFN 24 pin 4 x 4 mm, 0.5 mm pitch (wettable flank) package
- ADAS Computers
- Zonal ECU / Domain ECU
- Infotainment
- Digital Cockpit Systems
- LiDAR & Radar
- Automotive High-Speed Networking
- SerDes
| Resource Name | Resource Type | Date | Format | Size |
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