9SQL4954集成电路（IC）的应用特定时钟/定时规格书PDF中文资料

描述 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.

特性 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