USB MultiSwitchTM Hub
Datasheet
Table 4.4 Power, Ground, and No Connect (continued)
SYMBOL TYPE FUNCTION
+1.8V Filtered analog power for internal PLL.
NAME
VDD PLL
VDDPLL18
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
NC
VSS
NC
Ground
No Connect
Table 4.5 Buffer Type Descriptions
DESCRIPTION
BUFFER
I
IPD
Input.
Input, Weak Internal pull-down.
Input, Weak Internal pull-up.
Input with Schmitt trigger.
IPU
IS
IOSD12
Open drain….12mA sink with Schmitt trigger, and must meet I2C-Bus Specification Version 2.1
requirements.
ICLKx
OCLKx
I-R
XTAL Clock Input
XTAL Clock Output
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.
Revision 1.91 (08-22-07)
SMSC USB2524
DATA1S6HEET
SMSC [ SMSC CORPORATION ]
