9ZX21901BKLF datasheet(1/16 Pages) IDT

Part #	9ZX21901BKLF

Description	19-Output Differential Zbuffer for PCIe Gen2/3 and QPI

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Manufacturer	IDT [Integrated Device Technology]

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9ZX21901B

IDT®

19-Output Differential Zbuffer for PCIe Gen2/3 and QPI

1586J - 12/08/11

19-Output Differential Zbuffer for PCIe Gen2/3 and QPI

1

Description

The 9ZX21901 is Intel DB1900Z Differential Buffer suitable for PCI-

Express Gen3 or QPI applications.The part is backwards compatible

to PCIe Gen1 and Gen2. A fixed external feedback maintains low

drift for critical QPI applications. In bypass mode, the 9ZX21901

can provide outputs up to 400MHz

Key Specifications

•

Cycle-to-cycle jitter: < 50ps

•

Output-to-output skew: <65ps

•

Input-to-output delay: Fixed at 0 ps

•

Input-to-output delay variation: <50ps

•

Phase jitter: PCIe Gen3 < 1ps rms

•

Phase jitter: QPI 9.6GB/s < 0.2ps rms

Features/Benefits

•

Fixed feedback path/ 0ps input-to-output delay

•

9 Selectable SMBus addresses/ Multiple devices can

share same SMBus segment

•

8 dedicated OE# pins/ hardware control of outputs

•

PLL or bypass mode/ PLL can dejitter incoming clock

•

Selectable PLL BW/ minimizes jitter peaking in

downstream PLL's

•

Spread spectrum compatible/tracks spreading input clock

for EMI reduction

•

SMBus Interface/ unused outputs can be disabled

•

100MHz & 133.33MHz PLL mode/ Legacy QPI support

•

Undriven differential outputs in Power Down mode for

maximum power savings

Functional Block Diagram

DATASHEET

Logic

DIF_IN

DIF_IN#

DIF(18:0)

HIBW_BYPM_LOBW#

SMBDAT

SMBCLK

CKPWRGD/PD#

IREF

OE(5_12)#

8

SMB_A0_tri

SMB_A1_tri

100M_133M#

Z-PLL

(SS Compatible)

DFB_OUT

DFB_IN

DFB_IN#

Recommended Application

19 output PCIe Gen3/QPI buffer with fixed feedback for Romley

platforms

Output Features

•

19 - 0.7V current mode differential HCSL output pairs

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