MEMS resonator, HCSL output, 7×5 mm footprint
The DSC8124AI5T is a MEMS-based standard XO (Standard) with an HCSL output stage, covering a 10 MHz to 460 MHz frequency range. The HCSL (High-Speed Current Steering Logic) output delivers a differential pair with a typical 0.7 V swing, terminated 50 Ω to ground on each leg — the standard reference clock for PCIe Gen1 through Gen4 interfaces. The six pads map to OE (pin 1), GND, output, complementary output, VDD, and NC — a layout shared with many quartz and MEMS oscillators, so a board designed for a 7×5 XO accepts this part without a layout change.
±10 ppm total stability, AEC-Q100 qualified
For a 100 MHz reference clock, ±10 ppm translates to ±1 kHz absolute frequency error — tight enough for a 10 GbE SerDes PLL that requires a reference within ±100 ppm. Maximum supply current is 42 mA; disabling the output (OE pin low) drops the current to 22 mA max while keeping the MEMS core and PLL running for instant restart. The wide supply range also means the part tolerates a 3.3 V rail that droops to 2.5 V during a transient without losing lock.
Active production, blank-programmable frequency
The device ships as a blank (user must program) unit; the target frequency is written using Microchip's TimeFlash programmer or a compatible production programmer. This is a factory-programmed part in the field, not a field-programmable oscillator in the traditional sense — the programming step sets the PLL divider and output format, and the part then behaves as a fixed-frequency oscillator.