What this clock generator does for your line card
The AD9577BCPZ-R7 is a PLL-based clock generator that takes a clock or crystal input and produces up to five outputs in LVCMOS, LVDS, or LVPECL formats. It targets Ethernet, PCI Express, and SONET/SDH line cards — one IC covers the reference clocks for the PHY, the FPGA transceiver, and the backplane SerDes. Maximum output frequency is 637.5 MHz, which covers 1000BASE-X, PCIe Gen 1/2/3 reference clocks (100 MHz), and OC-48/STM-16 SONET rates. The 2:5 input-to-output ratio lets you fan out two references to five clock domains without an external fanout buffer.
Industrial temperature range and supply rails
It fits outdoor telecom cabinets, factory-floor Ethernet switches, and base-station timing cards where the ambient can hit 85°C. Supply voltage range is 3.0 V to 3.6 V, which matches the 3.3 V rail common on line cards. The single-circuit PLL means one independent PLL core — if your design needs two asynchronous clock domains (e.g., a 125 MHz Ethernet and a 100 MHz PCIe), the AD9577 handles both from the same PLL, but they share the VCO.
Package and mounting — what the 40-LFCSP means for your board
Housed in a 40-lead LFCSP-WQ (6x6 mm) with an exposed pad. Surface-mount only; no through-hole option. Cut Tape (CT) is also available for prototypes. No tube option — if your line feeder expects tubes, you will need to transfer from reel to tube manually.