1 Features

• LP-HCSL clock buffer that support:

– PCIe Gen 1 to Gen 6

– CC (Common Clock) and IR (Independent

Reference) PCIe architectures

– Input clock with or without SSC

• DB2000QL compliant:

– All devices meet DB2000QL specifications

– LMKDB1120 is pin-compatible to DB2000QL

• Extremely low additive jitter:

– 31 fs maximum 12 kHz to 20 MHz RMS

additive jitter at 156.25 MHz

– 13 fs maximum additive jitter for PCIe Gen 4

– 5 fs maximum additive jitter for PCIe Gen 5

– 3 fs maximum additive jitter for PCIe Gen 6

• Fail-safe input

• Flexible power-up sequence

• Automatic output disable

• Individual output enable

• SBI (Side Band Interface) for high-speed output

enable or disable

• LOS (Loss of Signal) input detection

• 85 Ω or 100 Ω output impedance

• 1.8 V / 3.3 V ± 10 power supply

• –40°C to 105°C ambient temperature

2 Applications

• High Performance Computing

• Server Motherboard

• NIC/SmartNIC

• Hardware Accelerator

3 Description

LMKDB1120 and LMKDB1108 are extremely-low-jitter

LP-HCSL buffers that support PCIe Gen 1 to

Gen 6 and are DB2000QL compliant. The devices

provide flexible power-up sequence, fail-safe inputs,

individual output enable and disable pins, loss of input

signal (LOS) detection and automatic output disable

features, as well as excellent power supply noise

rejection performance.

Both 1.8-V and 3.3-V supply voltages are supported.

For LMKDB1120, 1.8-V power supply saves 250 mW

power compared to 3.3 V.