Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo

6.2Buffer Type Descriptions

 

Table 6.2 USB2640/USB2641 Buffer Type Descriptions

 

 

BUFFER

DESCRIPTION

 

 

I

Input.

 

 

IPU

Input, weak internal pull-up.

 

 

IS

Input with Schmitt trigger.

 

 

I/O12

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

 

 

I/O200

Input/output buffer 12 mA with FET disabled, 100/200 mA source only when the FET

 

is enabled.

 

 

I/O12PD

Input/output buffer with 12 mA sink and 12 mA source, with an internal weak pull-down

 

resistor.

 

 

I/O12PU

Open drain, 12 mA sink with pull-up. Input with Schmitt trigger.

 

 

I/OD12PU

Input/open drain output buffer with a 12 mA sink.

 

 

O12

Output buffer with a 12 mA sink and a 12 mA source.

 

 

O12PD

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

 

 

O12PU

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

 

 

ICLKx

XTAL clock input.

 

 

OCLKx

XTAL clock output.

 

 

I/O-U

Analog input/output defined in USB specification.

 

 

I-R

RBIAS.

 

 

SMSC USB2640/USB2641

23

Revision 2.0 (10-03-08)

 

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