The DSC6003HI3B-027.0000 is a 27 MHz MEMS-based XO from Microchip's DSC60XXB series, delivering a CMOS output from a 1.8V–3.3V supply rail. The 4-VFLGA package (1.60 mm x 1.20 mm footprint, 0.89 mm seated height) fits tight PCB layouts where a larger can oscillator would not clear the enclosure wall.
Supply voltage range and frequency stability
The 1.8V–3.3V supply range lets this oscillator serve as a single clock source across mixed-voltage domains — a 1.8V MCU core and a 3.3V peripheral bus can share the same reference without a level translator on the clock line. The ±20 ppm absolute pull range sets the frequency stability budget. For a 27 MHz reference driving a USB or Ethernet PHY, ±20 ppm keeps the bit-rate error within the receiver's tolerance window over the full temperature range.
Enable/Disable function for power gating
Instead of a separate load switch on the supply rail, the oscillator itself stops drawing current when disabled — a clean way to cut clock power without adding a MOSFET.