650 MHz LVPECL fanout buffer with multi-protocol input flexibility
The Renesas (formerly IDT) 8533AGI-01LFT is a 2:4 fanout buffer and multiplexer that accepts six differential input standards — CML, HCSL, LVDS, LVHSTL, LVPECL, and SSTL — and delivers a single LVPECL output at up to 650 MHz. It is a single-circuit device in a 20-TSSOP package, designed for clock distribution in telecom infrastructure, data converters, FPGA reference clock trees, and high-speed backplane applications where a clean LVPECL fanout is needed from a mixed-signal environment.
Input flexibility — the real selection driver
The 2:4 fanout ratio means one input channel can be distributed to four LVPECL loads, or the internal mux selects between two input sources for redundancy or clock-source failover. The wide input protocol support is the differentiating feature: a single BOM line can terminate CML from a SerDes, LVDS from an FPGA, or LVPECL from a high-speed ADC without external level-shifting resistors or translator parts. The 650 MHz ceiling covers gigabit-class SerDes reference clocks and most FPGA transceiver reference frequencies.
3.3V supply — plan the rail budget
The supply range is 3.135 V to 3.465 V, a tight 3.3 V ±5 % window. The differential input-to-output path is fully differential (Yes/Yes), so the part preserves signal integrity through the buffer without single-ended conversion.
For a production BOM this means no forced redesign cycle from obsolescence; the part can be qualified into new designs with confidence that the supply channel will remain open. The 20-TSSOP footprint is a standard body size (4.40 mm width), shared across the Renesas clock-buffer family, so a layout change for a different fanout ratio or output standard stays pin-compatible across the 20-pin TSSOP variants.
Sourcing this part to your BOM
For small quantities, the cut-tape option avoids reel minimums.