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USB MultiSwitch
TM
Hub
Datasheet
Revision 1.91 (08-22-07) 16 SMSC USB2524
DATASHEET
VDD PLL VDDPLL18 +1.8V Filtered analog power for internal PLL.
This pin must have a 4.7μF (or greater) ±20% (ESR
<0.1Ω) capacitor to VSS
VDD Analog
I/O
VDDA33 +3.3V Filtered analog PHY power, shared between
adjacent ports.
VSS VSS Ground
NC NC No Connect
Table 4.5 Buffer Type Descriptions
BUFFER DESCRIPTION
I Input.
IPD Input, Weak Internal pull-down.
IPU Input, Weak Internal pull-up.
IS Input with Schmitt trigger.
IOSD12 Open drain….12mA sink with Schmitt trigger, and must meet I2C-Bus Specification Version 2.1
requirements.
ICLKx XTAL Clock Input
OCLKx XTAL Clock Output
I-R RBIAS
IO-U Defined in USB Specification.
Note: Meets USB 1.1 requirements when operating as a 1.1-compliant device and meets
USB 2.0 requirements when operating as a 2.0-compliant device.
AIO Analog Input/output. Per PHY test requirements.
Table 4.4 Power, Ground, and No Connect (continued)
NAME SYMBOL TYPE FUNCTION