9DBL0452CKILFT

Overview

The 9DBL0452CKILFT is a 4-output, 3.3V PCIe zero-delay/fanout clock buffer from Renesas Electronics. It supports PCIe Gen 1 through Gen 6 and accommodates both Common Clock (CC) and Independent Reference architectures. The device features four Low Power HCSL (LP-HCSL) outputs that eliminate the need for external termination resistors by providing direct connection to 85Ω transmission lines. It accepts spread spectrum inputs and offers configurable operation via an SMBus interface or pin selection. Packaged in a space-saving 32-pin VFQFPN (5mm × 5mm), it operates within a temperature range of -40°C to +85°C.

Feature Summary

• Supports PCIe Gen 1–6 with additive jitter < 18fs RMS in fanout mode and < 100fs RMS in high-bandwidth zero-delay buffer mode.
• Four integrated LP-HCSL outputs designed for direct connection to 85Ω transmission lines, removing the requirement for discrete termination resistors.
• Spread spectrum tolerant input capability with dedicated output enable pins for each channel.
• Configurable via three selectable SMBus addresses or hardware pins; SMBus interface is optional for basic operation.

Applications

• PCIe adapter cards
• NVMe storage systems
• Network infrastructure equipment
• Hardware accelerators
• Industrial control and embedded systems

Procurement Notes

Verify the specific suffix CKILFT against the manufacturer's current datasheet to confirm package dimensions and moisture sensitivity level. Note that Renesas timing products are transitioning to SiTime; ensure long-term supply availability aligns with project timelines before finalizing procurement plans.

Selection Notes

Select this component when driving loads requiring 85Ω impedance matching without external resistors. Compare with the 9DBL0442C variant if the target transmission line requires 100Ω integration instead. Ensure the design supports the 3.3V supply voltage range of 3.135V to 3.465V and utilizes the 32-pin VFQFPN footprint constraints.

Part Context

This part belongs to the 9DBL04xx family of low-power PCIe clock buffers. It serves as a fanout and zero-delay buffer solution for high-speed serial interfaces. The device is manufactured by Renesas Electronics Corporation, which has announced a transition of its timing product portfolio to SiTime.

Replacement Considerations

The 9DBL0442CKILFT is a functional alternative within the same family but integrates 100Ω terminations rather than the 85Ω terminations found in the 9DBL0452. Verify PCB trace impedance requirements before substituting.