CDCDB400RHBR

Overview

The CDCDB400RHBR is a DB800ZL-compliant 4-output LP-HCSL clock buffer designed for PCIe Gen 1 through Gen 7, QPI, UPI, SAS, and SATA interfaces. It operates on a single 3V to 3.6V supply with a maximum frequency of 250 MHz. The device features four hardware output enable controls, programmable 85Ω or 100Ω differential output terminations, and an SMBus interface for configuration. Additive phase jitter ranges from 11.3fs RMS (PCIe Gen 7) to 38fs RMS (DB2000Q filter). It supports common clock and individual reference architectures in a 32-pin VQFN package.

Feature Summary

• DB800ZL-compliant 4-output LP-HCSL clock buffer supporting PCIe Gen 1-7
• Additive phase jitter: 11.3fs RMS (PCIe Gen 7), 16.1fs RMS (PCIe Gen 6), 25fs RMS (PCIe Gen 5)
• Programmable integrated 85Ω (default) or 100Ω differential output termination
• Four independent hardware output enable (OE#) pins and SMBus control

Applications

• Microserver & tower server
• Storage area network & host bus adapter card
• Network attached storage
• Hardware accelerator
• Rack server

Procurement Notes

Verify the RHB suffix indicates the Tape & Reel packaging format. Confirm the component meets DB800ZL specifications for the target PCIe generation. Ensure the operating temperature range (-40°C to +105°C) aligns with system requirements. Check for RoHS compliance status in the specific manufacturing lot documentation.

Selection Notes

Select this buffer for systems requiring low additive jitter distribution for high-speed serial interfaces like PCIe Gen 1-7. The device supports both Common Clock and Individual Reference architectures. Verify that the board impedance matches the selectable 85Ω or 100Ω internal termination settings. Ensure the design accommodates the 32-VQFN exposed pad thermal requirements.

Part Context

The CDCDB400 is a derivative of the DB800ZL buffer and meets or exceeds parameters defined in the DB2000Q specification. It is part of Texas Instruments' portfolio of clock management solutions for high-performance computing and networking applications. The RHBR variant specifically denotes the reel-packaged version of the standard CDCDB400 component.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.