156.25 MHz LVDS MEMS oscillator — board-fit and routing
The DSC1123CI5-156.2500 is a MEMS-based XO (Standard) delivering a 156.25 MHz LVDS output — a common reference frequency for 10GbE, PCIe Gen 2/3, and FPGA transceiver clocks. The enable/disable function (E/D) pulls the output to high-Z when the enable pin is driven low, useful for clock gating in multi-frequency designs.
Industrial temperature grade and frequency stability
The ±10 ppm frequency stability holds the 156.25 MHz edge within a tight window across the full temperature swing — critical for keeping the link up on a 10GBASE-R PHY without bit errors. That 10 mA saving per oscillator adds up when a board carries multiple clock trees for different interfaces.
No official second source or pin-compatible alternative from Microchip; the DSC11xx family shares the same footprint but output types differ (HCSL, LVPECL, LVCMOS). Verify output type before substituting.