NB3L8543SDTG

Clock Buffers, Drivers Overview

The NB3L8543SDTG is a differential 2:1 multiplexer to four LVDS clock fanout buffer manufactured by onsemi. It supports two selectable differential clock inputs (CLK/CLK and PCLK/PCLK) with synchronous clock enable functionality. The device operates at supply voltages of 2.5 V ±5% or 3.3 V ±10%, delivering a maximum output frequency of 650 MHz at 3.3 V. Key electrical specifications include a typical additive phase jitter of 50 fs RMS, a maximum output skew of 40 ps, and a propagation delay of 1.9 ns. It is housed in a TSSOP-20 package.

Clock Buffers, Drivers Feature Summary

• Multiplexed input architecture supporting CLK/CLK and PCLK/PCLK pairs
• Four differential LVDS output pairs with synchronized clock enable
• Low jitter performance with 50 fs typical RMS additive phase jitter
• Wide input compatibility including LVPECL, LVDS, CML, HCSL, SSTL, and HSTL

Clock Buffers, Drivers Applications

• High-speed data communication systems requiring low skew clock distribution
• Server and storage backplane architectures
• Networking equipment utilizing multiple clock domains
• Test and measurement instrumentation

Clock Buffers, Drivers Procurement Notes

Verify the specific ordering suffix against current manufacturer documentation. The 'DT' suffix indicates a rail shipping format, while 'R2G' denotes tape and reel packaging. Confirm that the component meets RoHS compliance requirements for the intended assembly process. Ensure the procurement channel provides valid traceability for the lead-free designation.

Clock Buffers, Drivers Selection Notes

Select this component when a single-ended or differential source must drive four LVDS loads with minimal skew. The NB3L8543S allows selection between two independent clock sources via the CLK_SEL pin. Designers must account for the synchronous nature of the CLK_EN signal, which disables outputs only on the falling edge of the input clock to prevent runt pulses. Input termination resistors are required for proper interface matching.

Clock Buffers, Drivers Part Context

This part belongs to the NB3L85xx series of clock buffers and muxes from onsemi. It serves as a high-performance solution for distributing reference clocks in complex digital systems. The device integrates internal pull-up and pull-down resistors on control pins to simplify board layout. It is designed for industrial temperature ranges (-40°C to +85°C).

Clock Buffers, Drivers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided datasheet. Engineers should consult the manufacturer's official cross-reference tools or application notes for verified alternatives before replacing this component.