SMSC USB2512Ai - Manual (Page 12)

Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
Revision 1.97 (08-11-08) 12 SMSC USB2512Ai
DATASHEET
3.2 Buffer Type Descriptions
Table 3.4 Buffer Type Descriptions
BUFFER DESCRIPTION
I/O Input/Output.
IPD Input with internal weak pull-down resistor.
IPU Input with internal weak pull-up resistor.
IS Input with Schmitt trigger.
O12 Output 12mA.
I/O12 Input/Output buffer with 12mA sink and 12mA source.
I/OSD12
Open drain with Schmitt trigger and 12mA sink. Must meet I
2
C-Bus Specification
Version 2.1 requirements.
ICLKx XTAL clock input.
OCLKx XTAL clock output.
I-R RBIAS.
I/O-U Analog Input/Output Defined in USB specification.