Clock generator with spread-spectrum — what it does on the board
The Cypress W181-53SZ is a single-circuit clock/frequency synthesizer with an integrated PLL and spread-spectrum clock generation. It accepts a clock or crystal input and delivers a CMOS output up to 75 MHz. The spread-spectrum modulation reduces peak electromagnetic emissions at the fundamental and harmonics — useful for passing radiated-emission limits without adding ferrite beads or shielding cans. Temperature range is 0°C to 70°C, commercial grade. That fits indoor equipment, office peripherals, consumer electronics, and test gear. Not rated for industrial enclosures, engine bays, or outdoor telecom cabinets.
Spread-spectrum — why it matters for EMI compliance
Spread-spectrum clock generation modulates the output frequency around the center frequency, spreading the radiated energy across a wider band. Peak amplitude at any single harmonic drops, which can push a design below the FCC or CISPR Class B limit without extra filtering. The W181-53SZ is a dedicated spread-spectrum generator, not a plain PLL — the modulation profile is built into the silicon.
Package and footprint — 8-SOIC, surface mount
Housed in an 8-pin SOIC package (3.90 mm body width), the W181-53SZ fits a standard narrow-SOIC footprint. The supplier device package is 8-SOIC. Mounting is surface-mount only; no through-hole variant. The bulk shipping option means parts arrive in tubes or trays, not tape-and-reel — factor that into your pick-and-place setup if you need reeled units.
Lifecycle and sourcing — active, no LTB watch
The W181-53SZ is listed as Active with ROHS3 compliance. Pricing and lead time are confirmed at quote time against an RFQ — no stock number on this page, but we source and quote to order.