CDCDB2000 DB2000QL-Compliant 20-Output Clock Buffer for PCIe Gen 1 to Gen 5

1 Features

• 20 LP-HCSL outputs with integrated 85-Ω output

terminations

• 8 hardware output enable (OE#) controls

• Additive phase jitter after DB2000QL filter:

< 0.08ps rms

• Supports PCIe Gen 4 and Gen 5 Common Clock

(CC) and Individual Reference (IR) architectures

– Spread spectrum-compatible

• Cycle-to-cycle jitter: < 50 ps

• Output-to-output skew: < 50 ps

• Input-to-output delay: < 3 ns

• 3.3-V core and IO supply voltages

• Hardware-controlled low power mode (PD#)

• Side-Band Interface (SBI) for output control in PD#

mode

• 9 selectable SMBus addresses

• Power consumption: < 600 mW

• 6-mm × 6-mm, 80-pin TLGA/GQFN package

2 Applications

• Microserver & tower server

• Storage area network & host bus adapter card

• Network attached storage

• Hardware accelerator

3 Description

The

CDCDB2000

is

a

20-output

LP-HCSL,

DB2000QL compliant, clock buffer capable of

distributing the reference clock for PCIe Gen 1-5,

QuickPath Interconnect (QPI), UPI, SAS, and SATA

interfaces. The SMBus, SBI, and 8 output enable

pins allow the configuration and control of all 20

outputs individually. The CDCDB2000 is a DB2000QL

derivative buffer and meets or exceeds the system

parameters in the DB2000QL specification. The

CDCDB2000 is packaged in a 6-mm × 6-mm TLGA/

GQFN package with 80 leads.

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

CDCDB2000

TLGA (80)

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

CDCDB2000

20x LP-HSCL Output Buffer

SMBus

Control

OE#

Control

LP-HCSL

PCIe PHY

PCIe PHY

PCIe PHY

PCIe PHY

LP-HCSL

20

PCIe PHY

PCIe PHY

PCIe Device

Side-Band

Interface

Control Interface

CDCDB2000 System Diagram

CDCDB2000

SNAS787B – NOVEMBER 2019 – REVISED OCTOBER 2024

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.