What the ECS-3525-640-B-TR delivers
HCMOS output means it swings rail-to-rail into a CMOS load — the clean digital edge you need before the PLL or clock tree divides it down.
Frequency stability and the ±50 ppm question
±50 ppm stability across 0°C to 70°C is the commercial temperature grade — the right fit for indoor equipment, embedded processors, and communication front-ends where the clock does not drive a high-speed serializer link. If your timing budget needs tighter tolerance, the ±50 ppm figure is the total stability across temperature, not a per-degree drift rate, so the accumulated error over a long hold-in period stays within that band.
Package and board-integration checklist
Tape-and-reel packaging suits automated placement; the part ships in TR as standard with CT cut tape as an option. The enable/disable pin should be pulled to a defined logic level — the datasheet defines the threshold — to avoid an undefined output state at power-up.