9DB423BGLF

Overview

The Renesas Electronics Corporation 9DB423BGLF is a clock buffer designed for PCI Express Gen 2 applications. It features four outputs and incorporates a Quad-Phase Interpolated (QPI) architecture to manage jitter. The device operates within a supply voltage range of 3.135 V to 3.465 V and supports input frequencies up to 166 MHz, with maximum output frequencies reaching 100 MHz. It utilizes HCSL signaling and is housed in a TSSOP-28 package. This component is currently classified as a discontinued product by the manufacturer.

Feature Summary

• PCIe Gen 2 Buffer: Designed specifically for PCI Express Generation 2 clock distribution requirements.
• Quad-Phase Interpolation (QPI): Utilizes QPI technology to reduce phase jitter compared to standard fanout buffers.
• Four Differential Outputs: Provides four differential output pairs for driving multiple loads.
• HCSL Signaling: Supports Low-Power High-Speed Current Mode Logic (LP-HCSL) output signaling.

Applications

• PCI Express Gen 2 Clock Distribution
• Server and Workstation Motherboards
• High-Performance Computing Systems

Procurement Notes

The 9DB423BGLF is officially listed as a discontinued or end-of-life product by Renesas Electronics. Availability is restricted to remaining stock from distributors or third-party suppliers. Verification of part authenticity and storage history is critical when sourcing this obsolete component. Engineers should review Product Change Notifications (PCNs) and discontinuance notices for any process changes prior to procurement.

Selection Notes

Designers requiring active alternatives should consider the 9DB433 series for PCIe Gen 3 compatibility or the 9DML04 series for multiplexing functions. When selecting replacements, ensure that the new component supports the required input frequency range (up to 166 MHz) and maintains compatible HCSL output levels. Package footprint compatibility must be verified if transitioning to a different pin count or package type.

Part Context

The 9DB423BGLF belongs to the 9DB423 family of clock buffers. It is distinct from the 9DB433 series, which targets PCIe Gen 3 standards. The 'B' suffix typically denotes specific packaging or temperature grade variations within the Renesas portfolio. As an older generation component, it serves legacy designs requiring Gen 2 compliance with lower jitter performance than basic fanout buffers.

Replacement Considerations

Public confirmed substitute part numbers include the 8T49N240-998NLGI, identified as a clock synthesizer/jitter attenuator alternative. Users should verify functional equivalence regarding jitter specifications and interface compatibility before substitution.