1 Features

• LP-HCSL clock buffer and clock MUX that support:

– PCIe Gen 1 to Gen 7

– 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:

– 31fs maximum 12kHz to 20MHz RMS additive

jitter at 156.25MHz

– 13fs maximum additive jitter for PCIe Gen 4

– 5fs maximum additive jitter for PCIe Gen 5

– 3fs maximum additive jitter for PCIe Gen 6

– 2.1fs maximum additive jitter for PCIe Gen 7

• Fail-safe input

• Fail-safe outputs (LMKDB1120FS, LMKDB1108FS

and LMKDB1104FS only)

• 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

• 85Ω or 100Ω output impedance

• 1.8V / 3.3V ± 10% power supply

• –40°C to 105°C ambient temperature

2 Applications

• High Performance Computing

• Server Motherboard

• NIC/SmartNIC

• Hardware Accelerator

3 Description

The LMKDB devices are a family of extremely-lowjitter

LP-HCSL buffers that support PCIe Gen 1 to

Gen 7 and are DB2000QL compliant. The devices

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

fail-safe outputs, individual output active and inactive

pins, loss of input signal (LOS) detection and

automatic output disable features, as well as excellent

power supply noise rejection performance.

Both 1.8V and 3.3V supply voltages are supported.

For LMKDB1120, 1.8V power supply saves 250mW

power compared to 3.3V.