CDCLVP1208RHDR

Overview

The CDCLVP1208RHDR is a high-performance clock buffer manufactured by Texas Instruments, featuring an 8-output LVPECL fanout configuration. It accepts differential or single-ended inputs including LVPECL, LVDS, and LVCMOS/LVTTL through a selectable multiplexer controlled by the IN_SEL pin. The device supports maximum clock frequencies up to 2 GHz with a maximum propagation delay of 450 ps. Powered by a 2.375 V to 3.6 V supply, it delivers low additive jitter (less than 100 fs RMS from 10 kHz to 20 MHz) and minimal output skew of 20 ps. Packaged in a 28-pin VQFN (5 mm x 5 mm), it operates within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Universal Inputs: Accepts LVPECL, LVDS, and LVCMOS/LVTTL signals via two selectable input pairs.
• Low Additive Jitter: Achieves less than 100 fs RMS jitter across a 10 kHz to 20 MHz offset range.
• High-Speed Performance: Supports maximum clock frequencies up to 2 GHz with 20 ps output skew.
• Integrated Multiplexer: Features an on-chip MUX for selecting between two clock inputs using a single control terminal.

Applications

• Wireless Communications
• Telecommunications and Networking Devices
• Medical Imaging Systems
• Test and Measurement Equipment

Procurement Notes

Verify that the ordering suffix RHDR corresponds to the Tape & Reel packaging format as specified in the datasheet. Confirm the component grade matches industrial requirements (-40°C to +85°C). Ensure the supplier provides documentation confirming the RoHS compliance status and lead-free manufacturing process for this specific part number.

Selection Notes

Select the CDCLVP1208RHDR when driving multiple LVPECL loads with strict timing constraints. Ensure the design accommodates the 2.375 V to 3.6 V supply voltage range. Verify that the PCB layout supports the exposed thermal pad for adequate heat dissipation, as the junction-to-pad thermal resistance is critical for maintaining performance at higher temperatures.

Part Context

This component belongs to the CDCLVP series of low-power, low-jitter clock buffers. It serves as a distribution element for converting universal input clock signals into eight synchronized LVPECL outputs. The RHDR suffix indicates the specific tape-and-reel packaging variant designed for automated surface-mount assembly processes.

Replacement Considerations

Direct replacements within the same family include CDCLVP1204 (4 outputs) and CDCLVP2104 (dual 1:4 buffers). For identical 8-output functionality, verify compatibility with CDCLVP1208 variants differing only in package or reel specifications.

FAQ

How is the input source selected?

Input selection is managed by the IN_SEL pin. A logic low selects the INP0/INN0 pair, while a logic high selects the INP1/INN1 pair.

What is the recommended termination for LVPECL outputs?

The recommended termination is a 50 Ω resistor connected to (VCC - 2) V. AC coupling is required if the driver and receiver operate on different supply voltages.

Can unused inputs be left floating?

Yes, unused differential input pairs can be left floating without affecting the operation of the active inputs.