What this clock chip does on a server board
The Cypress CY28346ZC-2 is a processor-specific PLL clock generator built for Intel CPU server platforms. It takes a single crystal input and fans it out across 22 outputs — a mix of HCSL and LVCMOS — at up to 200 MHz. That 1:22 ratio means one crystal feeds the whole clock tree: CPU reference clocks, PCIe, memory buffers, and chipset. No external fanout buffers needed on that side of the board.
Supply voltage and temperature — the operating window
Runs on a 3.135 V to 3.465 V supply. The 0°C to 85°C ambient range covers most server rooms and data-centre environments — not rated for extended industrial or outdoor use. If the board sits in an unconditioned telecom cabinet or a factory floor, this part is not the fit.
Differential input, single-ended input — what the pins expect
The input side is single-ended (crystal), but the outputs are differential HCSL. That differential-to-single-ended ratio is listed as No/Yes — meaning no differential inputs, but all outputs are differential-capable. For a server board that needs low-jitter HCSL clocks to the CPU and chipset, this matches. LVCMOS outputs are also available for slower peripherals, giving the designer one device for both clock domains.