6-Output DB800ZL Derivative for
PCIe Gen1–4 and UPI with Write
Lock
9ZXL0632E / 9ZXL0652E
Datasheet
Description
Features
▪ SMBus write lock feature; increases system security
▪ LP-HCSL outputs; eliminate 12 resistors, save 20mm2 of area
The 9ZXL0632E / 9ZXL0652E second-generation,
enhanced-performance DB800ZL differential buffers. The parts
are functionally compatible to the 9ZXL0632A and 9ZXL0652A
while offering much improved phase jitter performance. A fixed
external feedback maintains low drift for critical QPI/UPI
applications. The 9ZXL0632E and 9ZXL0652E have an SMBus
Write Lockout pin for increased device and system security.
(0632E)
▪ LP-HCSL outputs with 85Ω Zout; eliminate 24 resistors, save
48mm2 of area (0652E)
▪ 6 OE# pins; hardware control of each output
▪ Selectable PLL BW; minimizes jitter peaking in cascaded PLL
topologies
PCIe Clocking Architectures
Supported
▪ Hardware/SMBus control of PLL bandwidth and bypass;
change mode without power cycle
▪ Common Clocked (CC)
▪ Spread spectrum compatible; tracks spreading input clock for
EMI reduction
▪ Independent Reference (IR) with and without spread spectrum
▪ 100MHz PLL mode; UPI support
▪ 5 × 5 mm 40-QFN package; small board footprint
Typical Applications
▪ Servers
▪ Storage
▪ JBOD
Key Specifications
▪ Cycle-to-cycle jitter < 50ps
▪ Output-to-output skew < 50 ps
▪ Networking
▪ Input-to-output delay: Fixed at 0ps
▪ Input-to-output delay variation < 50ps
▪ Phase jitter: PCIe Gen4 < 0.5ps rms
▪ Phase jitter: QPI/UPI > = 9.6GB/s < 0.2ps rms
▪ Phase jitter: IF-UPI < 1.0ps rms
Output Features
▪ 6 Low-power HCSL (LP-HCSL) output pairs (0632E)
▪ 6 Low-power HCSL (LP-HCSL) output pairs with 85Ω Zout
(0652E)
Block Diagram
VDDR
VDDA
VDD x9
FBOUT_NC#
FBOUT_NC
PLL
DIFIN#
DIF5#
DIF5
DIFIN
vSMB_WRTLOCK
6 outputs
SMBus
Engine Configuration
Factory
SMBCLK
SMBDAT
DIF0#
DIF0
^vHIBW_BYPM-LOBW#
^CKPWRGD_PD#
vOE[5:0]#
Control Logic
Resistors are integrated on 9ZXL065x
devices and external on9ZXL063x devices
GNDR
EPAD/GND
©2018 Integrated Device Technology, Inc.
1
August 14, 2018