CDCDB800 DB800ZL-Compliant 8-Output Clock Buffer for PCIe Gen 1 to Gen 5

1 Features

• 8 LP-HCSL outputs with programmable integrated

85-Ω (default) or 100-Ω differential output

terminations

• 8 hardware output enable (OE#) controls

• Additive phase jitter after PCIE Gen5 filter: < 25 fs,

RMS (maximum)

• Additive phase jitter after DB2000Q filter: < 38 fs,

RMS (maximum)

• Supports PCIe Gen 4 and Gen 5 Common Clock

(CC) and Individual Reference (IR) architectures

– Spread spectrum-compatible

• Output-to-output skew: < 50 ps

• Input-to-output delay: < 3 ns

• Fail-safe input

• Programmable output slew rate control

• 3.3-V core and IO supply voltages

• Hardware-controlled low power mode (PD#)

• Current consumption: 72 mA maximum

• 6-mm × 6-mm, 48-pin VQFN package

2 Applications

• Microserver & tower server

• Storage area network & host bus adapter card

• Network attached storage

• Hardware accelerator

• Rack server

3 Description

The CDCDB800 is a 8-output LP-HCSL, DB800ZL-

compliant, clock buffer capable of distributing the

reference clock for PCIe Gen 1-5, QuickPath

Interconnect (QPI), UPI, SAS, and SATA interfaces.

The SMBus interface and eight output enable pins

allow the configuration and control of all eight

outputs individually. The CDCDB800 is a DB800ZL

derivative buffer and meets or exceeds the system

parameters in the DB800ZL specification. It also

meets or exceeds the parameters in the DB2000Q

specification. The CDCDB800 is packaged in a 6-mm

× 6-mm, 48-pin VQFN package.

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

CDCDB800

VQFN (48)

6.00 mm × 6.00 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

PCIe Gen 4-5

Clock

Generator

CDCDB800

8x LP-HSCL Output Buffer

SMBus

Control

OE#

Control

LP-HCSL

PCIe PHY

PCIe PHY

PCIe PHY

PCIe PHY

LP-HCSL

8

PCIe PHY

PCIe PHY

PCIe Device

Control Interface

CDCDB800 System Diagram

CDCDB800

SNAS818 – JULY 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.