LMKDB1104Z100REXT

Overview

The LMKDB1104Z100REXT is a low-jitter LP-HCSL clock buffer from Texas Instruments, designed for PCIe Gen 1 to Gen 7 architectures. It features one differential input and four differential outputs with a fixed 100Ω output impedance. The device supports operating frequencies up to 400 MHz and operates on a single 1.8V or 3.3V power supply. Key electrical characteristics include extremely low additive jitter (e.g., 2.1fs max for PCIe Gen 7) and compliance with DB2000QL specifications. It includes fail-safe inputs, individual output enables, and loss-of-signal detection.

Feature Summary

• Ultra-low additive jitter: 31fs max (12kHz-20MHz RMS) at 156.25MHz
• Four differential LP-HCSL outputs with fixed 100Ω impedance
• Supports PCIe Gen 1 through Gen 7 and DB2000QL standards
• Single 1.8V or 3.3V power supply operation

Applications

• High Performance Computing systems
• Server Motherboards
• NIC/SmartNIC designs
• Hardware Accelerators

Procurement Notes

Verify the specific suffix 'REXT' against official documentation to confirm package type and tape/reel specifications. Ensure compatibility with the required 100Ω output impedance configuration. Check for RoHS compliance status in the latest datasheet revision.

Selection Notes

Select this component when a 1-to-4 fan-out buffer is required for high-speed PCIe interfaces. The fixed 100Ω impedance suits applications requiring standard termination without external selection pins. Consider the LMKDB1104Z85 variant if 85Ω impedance is needed instead.

Part Context

This part belongs to the LMKDB family of ultra-low jitter clock buffers and muxes. It serves as a distribution element for reference clocks in complex digital systems. The 'Z100' designation indicates the 100Ω output impedance option within the LMKDB1104 series.

Replacement Considerations

LMKDB1104Z85REXT offers identical functionality with 85Ω output impedance. LMKDB1204 provides similar buffering but adds multiplexing capabilities with two inputs.