CDCDB400RHBT

Overview

The CDCDB400RHBT 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 programmable integrated differential output terminations (default 85Ω or selectable 100Ω), hardware-controlled low power mode, and SMBus 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 buffer supporting PCIe Gen 1-7
• Additive phase jitter: 11.3fs RMS (PCIe Gen 7) to 38fs RMS (DB2000Q)
• Programmable 85Ω or 100Ω differential output termination
• SMBus interface with 3 selectable addresses and individual OE# controls

Applications

• Microserver & tower server
• Storage area network & host bus adapter card
• Rack server & communications switch
• CT & PET scanners

Procurement Notes

Verify the specific suffix RHBT corresponds to the Tape & Reel packaging format as indicated in the product parameters. Confirm that the component meets the required operating temperature range of -40°C to 105°C for the target application environment. Ensure compatibility with the 3.3V core and IO supply voltages specified in the datasheet.

Selection Notes

Select this component when a low-jitter, DB800ZL-compliant buffer is required for high-speed serial interfaces like PCIe Gen 1-7. The choice depends on the need for integrated 85Ω/100Ω termination and SMBus configurability. Verify that the 32-VQFN package dimensions fit the PCB layout constraints and that the thermal resistance metrics are sufficient for the expected power dissipation.

Part Context

The CDCDB400 is a derivative of the DB800ZL specification, meeting or exceeding its system parameters. It also complies with the DB2000Q specification. This positioning allows it to serve as a direct replacement or upgrade in designs originally targeting those Intel specifications for reference clock distribution.

Replacement Considerations

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