200 MHz and 2:18 fanout — what they mean for the clock tree
The 200 MHz maximum frequency covers the vast majority of FPGA reference clocks, Ethernet PHY MAC clocks, and processor core clocks used in commercial equipment. The 2:18 input-to-output ratio means you can feed two independent clock sources into the buffer and select between them, while the eighteen outputs can drive multiple loads — useful for backplane clock distribution or synchronising several ASICs from a single oscillator. Because the part is specified as a low-skew driver, the propagation delay variation between any two outputs stays tight, which matters when the receiving devices have tight setup-and-hold windows.
Temperature grade and deployment environment
Rated for 0°C to 70°C, the CY29940AC is intended for temperature-controlled environments. It is not specified for extended-temperature operation.
Lifecycle and sourcing
The CY29940AC carries an Active lifecycle status, meaning Cypress (now part of Infineon) continues to manufacture it. The part is RoHS non-compliant per the original release, so verify your assembly line's solder alloy and reflow profile if you are running lead-free processes.