PLL clock generator with 1:5 fanout
The CY26121ZXI-21T is a PLL-based clock generator from Cypress's PacketClock™ series, accepting a crystal input and delivering clock and crystal outputs. It generates a single output frequency up to 33.33 MHz from a 1:5 input-to-output ratio, meaning one reference crystal drives five clock outputs — useful for distributing a clean timing signal across multiple ICs on the same board. The differential input and output are both marked No/No, so this is a single-ended CMOS clock generator — it does not produce LVDS or LVPECL levels. The output type is listed as Clock, Crystal, meaning one of the outputs can drive a crystal load directly.
16-TSSOP surface-mount footprint
The supplier device package is 16-TSSOP, so the PCB land pattern matches the standard JEDEC MO-153 footprint for this body size. Supplied in bulk (tube) packaging, not tape-and-reel — factor this into your pick-and-place feeder setup if you are running high-volume assembly; bulk tubes require a tube feeder or manual loading.