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

Chorus™ Automotive Clock Generators orchestrate complex timing for automotive compute and sensor systems by providing up to four configurable differential or up to eight single-ended low skew outputs. FailSafe™ technology enables ease of functional safety design by providing programmable end-to-end safety monitors. They are PCI Express (PCIe) Generations 1 - 6 compliant, with spread-spectrum options, on-chip regulators for extremely good power supply noise rejection, and phase-configurable and programmable skew outputs.

• Higher Performance: Up to 10X better resilience with integrated MEMS resonator.
• Features to enable functional safety: Built-in programmable fault monitors.
• Eliminates common issues such as noise coupling and impedance matching
• Smaller Footprint: up to 50% less board space
• Always-reliable startup across -40 to 125°C and in other harsh environmental conditions
• No activity dips/frequency jumps inherent with quartz.

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

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