What the CY22394FCT does on your board
The CY22394FCT is a single-PLL clock generator that takes an LVTTL or crystal input and produces up to five output clocks, with a split output standard: CMOS at up to 200 MHz and PECL at up to 400 MHz. The 1:5 fanout ratio lets one reference clock feed multiple downstream devices without adding a separate fanout buffer. The PLL includes a bypass mode, meaning you can route the input clock directly to the outputs for test or low-jitter bypass operation. This is useful during board bring-up or when you need to compare the PLL-generated clock against the source.
Supply voltage and temperature envelope
The part operates from a 3.135V to 3.465V supply, a standard 3.3V ±5% rail. The PLL's internal VCO and loop filter are sensitive to supply noise; expect to place a 0.1 µF ceramic decoupling capacitor within 2 mm of each supply pin. Temperature range is commercial grade: 0°C to 70°C ambient. This restricts the part to indoor, temperature-controlled equipment — office networking gear, consumer set-top boxes, or bench test instruments. Do not use in outdoor telecom cabinets or under-hood automotive without a full thermal analysis and a qualified industrial-grade alternative.
Package and footprint considerations
Housed in a 16-lead TSSOP with a 4.40 mm body width. The footprint is standard for low-pin-count clock generators; a two-layer board with a ground plane under the package is adequate for most designs. The supplier device package is listed as 16-TSSOP. The part is — not tape-and-reel — so plan for manual placement or a tube feeder if you are using an automated pick-and-place line.
Sourcing status and lifecycle
RoHS compliance is marked as non-compliant. Verify your assembly house's exemption policy for lead-bearing finishes — this part may require a waiver or a separate RoHS-compliant variant if your product must meet EU RoHS requirements.