Description
The 9SQL4952/9SQL4954/9SQL4958 devices comprise a family
of 3.3V PCIe Gen1–5 clock generators with UPI support. There
are 2, 4 and 8 outputs versions available and each differential
output has a dedicated OE# pin supporting PCIe CLKREQ#
functionality.

Features
▪ Integrated terminations for 85Ω systems save 4 resistors per
output
▪ 112–206 mW typical power consumption (at 3.3V)
▪ VDDIO rail allows 35% power savings at optional 1.05V
(9SQL4958 only)
▪ Devices contain default configuration; SMBus not required
▪ SMBus features allow optimization to application:
• Input polarity and pull-up/pull-downs
• Output slew rate and amplitude
• Output impedance (33Ω, 85Ω or 100Ω)
▪ Contact factory for customized default configurations
▪ 25MHz input frequency
▪ OE# pins support PCIe CLKREQ# function
▪ Pin-selectable SRnS 0%, CC 0% and CC/SRIS -0.5% spread
▪ SMBus-selectable CC/SRIS -0.25% spread
▪ Clean switching between the CC/SRIS spread settings
▪ BCLK outputs blocked until PLL is locked for clean system
startup
▪ 2 selectable SMBus addresses
▪ Space-saving packages: See Ordering Information for details
Output Features
▪ 2, 4 or 8 100MHz CPU/PCIe output pairs
▪ One 3.3V LVCMOS REF output with Wake-On-LAN (WOL)
support
▪ See AN-891 for easy AC-coupling to other logic families