Clock distribution buffer for single-ended to LVPECL translation
The Renesas 8535AG-31LFT is a 2:4 fanout buffer and multiplexer that accepts LVCMOS, LVTTL, or crystal inputs and delivers LVPECL outputs at frequencies up to 266 MHz. It provides a clean translation from single-ended clock sources to differential LVPECL, which is useful for distributing a reference clock across multiple high-speed logic loads while maintaining signal integrity. The part is housed in a 20-TSSOP package and operates over the commercial temperature range of 0°C to 70°C, making it suitable for indoor telecom, networking, and test equipment that does not require extended temperature tolerance.
Input-to-output ratio and differential output
The 2:4 ratio means one of two input sources (selected via the multiplexer) is fanned out to four LVPECL outputs. The inputs are single-ended (LVCMOS, LVTTL, or crystal), while the outputs are differential — the datasheet notes No/Yes for differential input/output, confirming the translation. This matters because LVPECL outputs provide better noise immunity and faster edge rates than single-ended logic, which is important when driving multiple clock receivers over PCB traces longer than a few inches. The 266 MHz maximum frequency covers most Ethernet, PCIe Gen1/2, and FPGA reference clock applications.
Lifecycle and compliance
The 8535AG-31LFT is listed as Active in production and ROHS3 compliant. The ROHS3 compliance covers the full substance restriction list (including the four phthalates), which satisfies EU and most global regulatory requirements for new designs.