Silicon Labs introduces a family of high-performance I2C-programmable crystal oscillators (XOs) delivering what the company claims is best-in-class jitter performance and frequency flexibility. With typical jitter performance as low as 95 fs, the Si544/Si549 Ultra Series programmable XOs maximize jitter margin for clocking high-speed 28-Gb/s and 56-Gb/s transceivers used in 100/200/400G communications and data center applications. The devices can generate any frequency from 200 kHz to 1.5 GHz with no frequency gaps and 4 parts-per-trillion (ppt) tuning resolution, enabling a single device to be used across a broad spectrum of applications.
The Si544/Si549 XOs support up to four presets, pin-selectable start-up frequencies. After power-up, the device operating frequency can easily be changed via an I2C interface. This enables a single oscillator to replace multiple single-, dual-, and quad-frequency XOs and multiplexer (mux) devices with a single oscillator. The device can be powered from a single 1.8V, 2.5V, or 3.3V supply. The Si54x XO’s I2C interface supports update rates as high as 1 MHz (Fast-mode Plus).
The Si544/Si549 XOs are available in 3.2 mm x 5 mm and 5 mm x 7 mm packages. Pricing in 10,000 unit quantities begins at $8.36 for Si549 XOs (95 fs rms jitter) and at $6.69 for Si544 XOs (150 fs rms jitter). For more information, datasheets are available for the Si544 and Si549 as well as the full Ultra-Series XOs.