LMKDB1120Z85NPPR

Overview

The LMKDB1120Z85NPPR is an ultra-low jitter LP-HCSL clock buffer supporting PCIe Gen 1 through Gen 7. It provides 20 differential outputs with a fixed 85Ω output impedance and features fail-safe inputs. The device operates on 1.8V or 3.3V ±10% supplies within a -40°C to 105°C ambient temperature range. Additive jitter performance includes maximums of 3fs for PCIe Gen 6, 5fs for Gen 5, and 13fs for Gen 4 at 156.25MHz. It supports both Common Clock (CC) and Independent Reference (IR) architectures.

Feature Summary

• Supports PCIe Gen 1 to Gen 7 with extremely low additive jitter (3fs max for Gen 6)
• Provides 20 LP-HCSL differential outputs with 85Ω impedance
• Compliant with Intel DB2000QL specifications and pin-compatible
• Includes SMBus control interface and Side-Band Interface (SBI)

Applications

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

Part Context

This component belongs to the LMKDB11xx family of ultra-low jitter LP-HCSL buffers. The Z85 suffix indicates a fixed 85Ω output impedance variant. It is housed in an NPP package (TLGA, 80 pins, 6mm × 6mm). The device is designed to replace legacy buffers like the Intel DB2000QL while offering superior jitter performance for next-generation PCIe standards.

Replacement Considerations

The LMKDB1120Z85NPPR is explicitly stated to be pin-compatible with the Intel DB2000QL. Designers replacing DB2000QL components can utilize this part without modifying the PCB footprint, provided power supply and control logic levels are compatible.