8-Output DB800ZL Derivative for
PCIe Gen1–4 and UPI with Write
Lock
9ZXL0832E / 9ZXL0852E
Datasheet
Description
Features
▪ SMBus write lock feature; increases system security
The 9ZXL0832E / 9ZXL0852E are second-generation, enhanced
performance DB800ZL differential buffers. The parts are
pin-compatible to the 9ZXL0831A and 9ZXL0851A while offering a
much improved phase jitter performance. A fixed external feedback
maintains low drift for critical QPI/UPI applications. The 9ZXL0832E
and 9ZXL0852E have an SMBus Write Lockout pin for increased
device and system security.
▪ LP-HCSL outputs; eliminate 16 resistors, save 27mm2 of area
(0832E)
▪ LP-HCSL outputs with 85Ω Zout; eliminate 32 resistors, save
64mm2 of area (0852E)
▪ 8 OE# pins; hardware control of each output
▪ Selectable PLL BW; minimizes jitter peaking in cascaded PLL
topologies
PCIe Clocking Architectures
Supported
▪ Common Clocked (CC)
▪ Hardware/SMBus control of PLL bandwidth and bypass; change
mode without power cycle
▪ Spread spectrum compatible; tracks spreading input clock for EMI
▪ Independent Reference (IR) with and without spread spectrum
reduction
▪ 100MHz & 133.33MHz PLL Mode; UPI and legacy QPI support
▪ 6 × 6 mm 48-VFQFPN package; small board footprint
Typical Application
▪ Servers
▪ Storage
Key Specifications
▪ Cycle-to-cycle jitter < 50ps
▪ Networking
▪ SSDs
▪ Output-to-output skew < 50ps
▪ 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
▪ 8 Low-Power (LP) HCSL output pairs (0832E)
▪ 8 Low-Power (LP) HCSL output pairs with 85Ω Zout (0852E)
Block Diagram
VDDR
VDDA
VDD x7
FBOUT_NC#
FBOUT_NC
PLL
DIFIN#
DIFIN
DIF7#
DIF7
^100M_133M#
vSMB_WRTLOCK
SMBCLK
8 outputs
SMBus
Engine Configuration
Factory
SMBDAT
DIF0#
DIF0
^vHIBW_BYPM-LOBW#
^CKPWRGD_PD#
vOE[7:0]#
Control Logic
Resistors are integrated on 9ZXL085x devices and
external on 9ZXL083x devices
GNDR
EPAD/GND
©2018 Integrated Device Technology, Inc
1
August 14, 2018