9SQL4952集成電路（IC）的應(yīng)用特定時鐘/定時規(guī)格書PDF中文資料

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