描述 Description

The 9Z61195D is a second-generation, enhanced-performance

DB1900Z derivative differential buffer. The part is a

pin-compatible upgrade to the 9Z61195A, offering much improved

phase jitter performance. A fixed external feedback maintains low

drift for critical QPI/UPI applications. In fanout mode, the

9Z61195D meets the DB2000Q additive phase jitter specification.

PCIe Clocking Architectures

? Common Clocked (CC)

? Independent Reference (IR) with and without spread spectrum

Typical Applications

? Servers

? Storage

? Networking

? SSDs

Output Features

? 19 Low-Power (LP) HCSL output pairs with 85Ω Zout

特性 Features

? LP-HCSL outputs with 85Ω Zout; eliminate 76 resistors, save

130mm2 of area

? SMBus OE bits; software control of each output

? 9 selectable SMBus addresses; multiple devices can share

same SMBus segment

? Selectable PLL bandwidths; minimizes jitter peaking in

cascaded PLL topologies

? Hardware/SMBus control of PLL bandwidth and bypass;

change mode without power cycle

? Spread spectrum compatible; tracks spreading input clock for

EMI reduction

? 10 × 10 mm 72-VFQFPN package; small board footprint

Key Specifications

? Cycle-to-cycle jitter: < 50ps

? Output-to-output skew: < 50ps

? Input-to-output delay: Fixed at 0ps

? Input-to-output delay variation: < 50ps

? Additive Phase jitter: PCIe Gen4 < 53fs rms

? Additive Phase jitter: IF-UPI < 70fs rms

? Additive Phase jitter: DB2000Q filter