MEMS clock with quad-output flexibility
The DSC400-0344Q0051KI1T is a MEMS-based XO (Standard) from Microchip's DSC400 series, delivering four independent clock outputs: one at 100 MHz and three at 156.25 MHz, selectable between HCSL and LVDS logic levels. With ±50 ppm frequency stability across the full -40°C to 85°C industrial range, this oscillator holds timing margin for 10GBASE-KR, PCIe Gen 3, or FPGA reference clock trees without external temperature compensation.
Supply rail and package fit
Operating from 2.25 V to 3.6 V, the DSC400-0344Q0051KI1T runs directly off a 2.5 V or 3.3 V rail without a separate LDO — the wide input range absorbs ±10 % supply tolerance typical of unregulated intermediate buses. Housed in a 20-VFQFN with exposed pad (5.00 mm × 3.20 mm, 0.90 mm height), the package requires a thermal via array under the pad for adequate heat transfer to the ground plane — a four-layer board with a solid copper pour under the pad keeps the junction temperature within the -40°C to 85°C operating envelope.