9ZXL1950_17 Datasheet, PDF (1/18 Pages) Integrated Device Technology – 19-Output DB1900Z Low-Power Derivative with 85ohm Terminations

19-Output DB1900Z Low-Power Derivative
with 85ohm Terminations
9ZXL1950
DATASHEET
General Description
The 9ZXL1950 is a DB1900Z derivative buffer utilizing
Low-Power HCSL (LP-HCSL) outputs to increase edge rates
on long traces, reduce board space, and reduce power
consumption more than 50% from the original 9ZX21901.It is
pin-compatible to the 9ZXL1930 and fully integrates the
output terminations. It is suitable for PCI-Express Gen1/2/3 or
QPI/UPI applications, and uses a fixed external feedback to
maintain low drift for demanding QPI/UPI applications.
Recommended Application
Buffer for Romley, Grantley and Purley Servers
Output Features
19 LP-HCSL output pairs w/integrated terminations (Zo =
85
Key Specifications
• Cycle-to-cycle jitter: <50ps
• Output-to-output skew: <50ps
• Input-to-output delay variation: <50ps
• Phase jitter: PCIe Gen3 <1ps rms
• Phase jitter: QPI/UPI 9.6GB/s <0.2ps rms
Features/Benefits
• LP-HCSL outputs; up to 90% IO power reduction, better
signal integrity over long traces
• Direct connect to 85Ω transmission lines; eliminates 76
termination resistors, saves 130mm² area
• Pin compatible to the 9ZXL1930; easy upgrade to reduced
board space
• 72-pin VFQFPN package; smallest 19-output Z-buffer
• Fixed feedback path; ~0ps input-to-output delay
• 9 Selectable SMBus addresses; multiple devices can share
same SMBus segment
• Separate VDDIO for outputs; allows maximum power
savings
• PLL or bypass mode; PLL can dejitter incoming clock
• 100MHz & 133.33MHz PLL mode; legacy QPI support
• 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
Block Diagram
DIF_IN
DIF_IN#
HIBW_BYPM_LOBW#
100M_133M#
CKPWRGD/PD#
SMB_A0_tri
SMB_A1_tri
SMBDAT
SMBCLK
Logic
Z-PLL
(SS Compatible)
FBOUT_NC
DIF(18:0)
9ZXL1950 MAY 11, 2017
1
©2017 Integrated Device Technology, Inc.