What the spread-spectrum PLL buys the board
The CY25811SC: This is a PLL-based spread spectrum clock generator — it takes a clean clock or crystal input and outputs a modulated clock that spreads the fundamental energy across a wider band, reducing peak EMI radiated from the PCB traces. If you're fighting a failed emissions test on a 32 MHz clock line, this part is the fix without a metal shield.
Supply rail and temperature envelope
Runs from a tight 3.135V to 3.465V rail — that's 3.3V ±5%, so a 3.0V or 3.6V supply is out of spec.
Package and mounting reality
Landed in an 8-SOIC package with 0.154-inch body width and 3.90 mm pitch. Surface-mount, no differential clock outputs — single-ended clock fan-out only. The 1:1 input-to-output ratio means it buffers one clock line, not a fan-out tree.
Lifecycle and compliance flag
The catch: it's RoHS non-compliant, so if your BOM requires lead-free assembly per EU directive, this part won't pass incoming inspection. Confirm your exemption or plan for a separate leaded process.