SMSC USB2250 User Manual

Ultra Fast USB 2.0 Multi-Slot Flash Media Controller

Revision 1.1 (05-29-08)

20

SMSC USB2250/50i/51/51i

I

Input.

IPU

Input with internal weak pull-up resistor.

IPD

Input with internal weak pull-down resistor.

IS

Input with Schmitt trigger.

I/O12

Input/Output buffer with 12mA sink and 12mA source.

I/O200

Input/Output buffer 12mA with FET disabled, 100/200mA source only when the FET is 
enabled.

I/O12PD

Input/Output buffer with 12mA sink and 12mA source with an internal weak pull-down 
resistor.

I/O12PU

Input/Output buffer with 12mA sink and 12mA source with a pull-up resistor.

O12

Output buffer with 12mA source.

O12PU

Output buffer with 12mA sink and 12mA source, with a pull-up resistor.

O12PD

Output buffer with 12mA sink and 12mA source, with a pull-down resistor.

ICLKx

XTAL clock input.

OCLKx

XTAL clock output.

I/O-U

Analog Input/Output as Defined in USB specification.

I-R

RBIAS.