CDCDB800RSLT

Overview

The CDCDB800RSLT is an 8-output LP-HCSL clock buffer compliant with the DB800ZL specification, designed for PCIe Gen 1 through Gen 7 reference clock distribution. It operates on a single 3V to 3.6V supply and supports input frequencies up to 250 MHz. The device features a maximum propagation delay of 3 ns and output-to-output skew under 50 ps. Additive phase jitter ranges from 11.3 fs RMS (PCIe Gen 7 filter) to 38 fs RMS (DB2000Q filter). It includes programmable 85Ω or 100Ω differential terminations, individual hardware output enables, and SMBus control within a 48-pin VQFN package.

Feature Summary

• Supports PCIe Gen 1-7, QPI, UPI, SAS, and SATA interfaces with low additive jitter (11.3 fs RMS max for PCIe Gen 7)
• Eight LP-HCSL outputs with individually controllable hardware OE# pins and SMBus interface
• Programmable integrated differential output termination selectable between 85Ω and 100Ω
• Fail-safe input design and programmable output slew rate control via SMBus registers

Applications

• Microserver and tower server systems
• Storage area network (SAN) and host bus adapter cards
• Network attached storage (NAS) devices
• Hardware accelerators and rack servers

Procurement Notes

Verify the ordering suffix 'RSL' corresponds to the Tape & Reel packaging format as specified in the datasheet orderable addendum. Confirm that the specific revision level matches the required system documentation updates. Ensure compatibility with the 48-VQFN (6x6mm) footprint during PCB layout verification.

Selection Notes

Select this component when distributing reference clocks for high-speed serial interfaces requiring DB800ZL compliance. The device supports both Common Clock and Individual Reference architectures. Verify that the system board impedance aligns with the programmable 85Ω or 100Ω termination settings to ensure signal integrity.

Part Context

The CDCDB800RSLT belongs to the CDCDB800 family of clock buffers manufactured by Texas Instruments. It serves as a derivative buffer meeting or exceeding the DB800ZL and DB2000Q specifications. The 'RSL' suffix denotes the specific tape and reel packaging variant of the 48-pin VQFN package.

Replacement Considerations

The CDCDB800RSLR is a compatible alternative within the same family, differing primarily in its packaging configuration rather than functional electrical parameters.