MEMS-based HCSL clock source for high-speed serial interfaces
The DSC8124CI5: The HCSL signaling standard is the typical reference clock for PCIe Gen1/2/3, Ethernet SERDES, and FPGA transceiver banks — the 0.7 V swing and common-mode voltage are set by the output stage, so the receiver termination (50 Ω to ground per line) must match the HCSL specification, not LVDS or LVPECL. This is a blank (user-programmable) device — it ships without a factory-set frequency and requires programming via Microchip's TimeFlash or a compatible programmer before placement. The available frequency range covers common PCIe reference clocks (100 MHz, 125 MHz) and Ethernet SERDES rates, making it a flexible BOM line for multi-rate designs.
±10 ppm stability and industrial temperature grade
This tighter-than-typical stability (±25 ppm or ±50 ppm is common for general-purpose oscillators) matters for precision timing in networking equipment, test instrumentation, and motor-drive control loops where accumulated jitter or frequency drift can push the link margin below the receiver's lock threshold. Maximum supply current is 42 mA — typical for a MEMS HCSL oscillator running at higher output frequencies — so budget this into the 3.3 V rail's total current draw during power-tree design.
6-SMD No Lead footprint and enable/disable function
The footprint is compatible with standard 3.2 mm x 2.5 mm oscillator land patterns — no board spin needed if migrating from a quartz XO of the same package.