LMKDB1104Z100REXR

Overview

The LMKDB1104Z100REXR is a high-performance 1:4 LP-HCSL clock buffer from the Texas Instruments LMKDB family. It provides four differential outputs with a selectable 100Ω impedance, designed for PCIe Gen 1 through Gen 7 architectures. The device supports both Common Clock (CC) and Independent Reference (IR) topologies. Key electrical parameters include a maximum operating frequency of 400 MHz, a maximum propagation delay of 1 ns, and an input/output voltage range of 1.8 V to 3.3 V. It operates within an ambient temperature range of -40°C to +105°C.

Feature Summary

• Four-channel LP-HCSL output buffer with 100Ω differential output impedance
• Supports PCIe Gen 1 to Gen 7 CC and IR architectures
• Fail-safe inputs ensure stable outputs during invalid input conditions
• Individual output enable pins allow flexible power management

Applications

• PCIe switch and retimer clock distribution
• Server motherboard clocking systems
• Hardware accelerator interfaces

Procurement Notes

Verify the specific REXR suffix against the manufacturer's latest documentation to confirm package dimensions and reel specifications. Ensure compatibility with standard SMD/SMT assembly processes. Confirm RoHS compliance status directly with the supplier or official datasheet before procurement.

Selection Notes

Select this component when a 1:4 fan-out with 100Ω termination is required for LP-HCSL signals. Compare against the LMKDB1104Z85 if 85Ω impedance is needed. Verify that the 400 MHz maximum frequency meets the system's clock requirements and that the 1.8V/3.3V supply rails are available.

Part Context

This part belongs to the LMKDB series of ultra-low jitter clock buffers and muxes. While the provided reference document details the LMKDB12xx MUX family, the LMKDB1104Z100REXR is identified in public catalogs as a member of the same functional family, specifically configured as a 1-input, 4-output buffer rather than a multiplexer.

Replacement Considerations

The LMKDB1104Z85 serves as a direct alternative if 85Ω output impedance is preferred. For applications requiring two inputs, consider the LMKDB1204 MUX family.