LMKDB1204REXR

Overview

The LMKDB1204REXR is a PCIe clock buffer and multiplexer from the Texas Instruments LMKDB11xx family. It supports PCIe Gen 1 through Gen 7 architectures, including Common Clock (CC) and Independent Reference (IR) configurations. The device accepts two differential clock inputs and provides four LP-HCSL differential outputs with selectable 85Ω or 100Ω output impedance. It features extremely low additive jitter, fail-safe input detection, and individual output enable controls. The component operates on dual power supplies of 1.8V and 3.3V ±10% within an ambient temperature range of -40°C to +105°C.

Feature Summary

• Supports PCIe Gen 1 to Gen 7 with CC and IR architectures
• Multiplexes two differential inputs to four LP-HCSL outputs
• Extremely low additive jitter: 2.1fs max for PCIe Gen 7
• Selectable 85Ω or 100Ω output impedance

Applications

• High Performance Computing
• Server Motherboard
• NIC/SmartNIC
• Hardware Accelerator

Part Context

The LMKDB1204REXR belongs to the LMKDB11xx family of ultra-low jitter LP-HCSL clock buffers. This family includes variants such as the LMKDB1104 (buffer), LMKDB1108, LMKDB1112, and LMKDB1120. While other family members function strictly as buffers, the LMKDB120x series specifically integrates multiplexing capabilities for redundant clock sources.