LMKDB1120Z100NPPR

Overview

The LMKDB1120Z100NPPR is a high-performance 1-to-20 LP-HCSL clock buffer from Texas Instruments, designed for PCIe Gen 1 through Gen 7 architectures. It features an extremely low maximum additive jitter of 31fs (12kHz to 20MHz RMS) at 156.25MHz and supports both Common Clock (CC) and Independent Reference (IR) configurations. The device operates on dual power supplies: 1.8V or 3.3V ±10% for analog circuits and 1.8V or 3.3V ±10% for outputs. It includes fail-safe inputs, individual output enable controls, Loss of Signal (LOS) detection, and Side-Band Interface (SBI) capabilities. The component is housed in an 80-pin TLGA package measuring 6mm × 6mm.

Feature Summary

• Supports PCIe Gen 1 to Gen 7 with DB2000QL compliance
• Maximum 31fs RMS additive jitter (12kHz to 20MHz)
• 1 input to 20 differential LP-HCSL outputs
• Dual supply operation: 1.8V/3.3V ±10%
• Fail-safe inputs and individual output enable pins

Applications

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

Procurement Notes

Verify the specific suffix 'NPPR' against the manufacturer's official orderable information to confirm tape-and-reel packaging details. Ensure the design utilizes the correct 80-pin TLGA footprint and accounts for the thermal pad connection requirements specified in the mechanical data section.

Selection Notes

Select this part when a 1-to-20 fan-out is required for PCIe Gen 1 to Gen 7 systems. Choose the Z100 variant specifically for designs requiring 100Ω output impedance. Consider the NPPR suffix only if reel-based procurement is necessary rather than tube packaging.

Part Context

This component belongs to the LMKDB11xx family of ultra-low jitter LP-HCSL buffers. It serves as a pin-compatible replacement for Intel's DB2000QL specification. The 'Z100' designation indicates a fixed 100Ω output impedance, distinguishing it from the Z85 variant which provides 85Ω impedance.

Replacement Considerations

The LMKDB1120Z100NPPR is explicitly documented as pin-compatible with the Intel DB2000QL. Designers replacing legacy components should verify that the target system supports the LP-HCSL output swing levels.