What this clock buffer does on the board
The CY2509ZC-1 is a PLL-based Zero Delay Buffer — it takes one or two LVCMOS/LVTTL reference inputs and regenerates ten outputs with edge alignment that cancels the propagation delay through the device. The PLL locks to the input frequency up to 140 MHz, so the output edges arrive at the same phase as the input, not delayed by the buffer's internal path. That deskew matters when you are distributing a clock across multiple loads on a dense digital board and cannot afford a static phase offset between the source and each destination. The "Spread Aware" series designation means the PLL tracks a spread-spectrum modulated input clock without losing lock — the loop bandwidth is wide enough to follow the modulation. If your system uses SSC to reduce EMI on the reference, this buffer passes that modulation through to the fanout outputs instead of filtering it out.
Package and footprint fit
Housed in a 24-TSSOP (4.40 mm body width), supplier device package 24-TSSOP. The 0.65 mm pin pitch on a TSSOP-24 fans out cleanly on a two-layer board — no via-in-pad or microvia needed. The supply operates from 2.97 V to 3.63 V, which covers 3.3 V nominal rails with margin for ripple. Confirm the board's 3.3 V rail stays within that window under load; the PLL's phase noise degrades if the supply droops below 2.97 V.
Lifecycle and compliance note
The part is RoHS non-compliant, which means the leads and internal plating contain lead. For RoHS-required builds, verify whether your assembly house accepts a non-compliant part under a customer-directed waiver, or evaluate a lead-free alternative in the same functional family.
Sourcing posture
Active and available through the authorized channel. We source against the BOM quantity per RFQ — no stock-holding claim, no immediate-ship promise. The 24-TSSOP package is a standard Infineon footprint; date-code and lot traceability are confirmed at order. If you need a second-source evaluation, the CY2305SXI-1HT covers a subset of the fanout at a lower max frequency and wider temperature range — compare the full parametric table before committing.