LMKDB1102REYT

Overview

The LMKDB1102REYT is a PCIe clock buffer within the LMKDB family, manufactured by Texas Instruments. It features one differential LP-HCSL input and two differential LP-HCSL outputs in a 20-pin VQFN package (3mm x 3mm). The device supports frequencies up to 400MHz with selectable 85Ω or 100Ω output impedance. It operates on dual power supplies: 1.71V to 1.89V for digital logic and 2.97V to 3.6V for I/O. Key features include fail-safe inputs, individual output enables, and loss of signal detection.

Feature Summary

• Supports PCIe Gen 1 through Gen 7 architectures
• Extremely low additive jitter performance compliant with DB2000QL
• Configurable output impedance (85Ω or 100Ω) via ZOUT_SEL pin
• Integrated Loss of Signal (LOS) detection and automatic output disable

Applications

• High Performance Computing systems
• Server motherboards
• Network Interface Cards (NIC/SmartNIC)
• Hardware accelerators

Procurement Notes

Verify the specific REY suffix corresponds to the 20-VFQFN (3x3 mm) package when sourcing. Confirm that the component meets DB2000QL specifications if required for the design. Ensure power supply rails match the recommended operating conditions of 1.8V and 3.3V ±10%.

Selection Notes

Select this component for designs requiring a single-input, dual-output LP-HCSL clock distribution network. It is suitable for both Common Clock (CC) and Independent Reference (IR) PCIe topologies. Consider the 20-pin VQFN footprint for space-constrained PCB layouts.

Part Context

This part belongs to the LMKDB12xx family, which includes mux variants like the LMKDB1202. While the LMKDB1202 handles two inputs, the LMKDB1102 variant functions specifically as a buffer with one input. Both share similar electrical characteristics and packaging options within the LMKDB series.

Replacement Considerations

The LMKDB1202REX serves as a functional alternative within the same family, offering multiplexing capabilities instead of buffering. Other LMKDB11xx variants provide different output counts (e.g., LMKDB1104, LMKDB1108) while maintaining similar input/output interface standards.