High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller

Datasheet

 

 

6.2

Buffer Type Descriptions

 

 

Table 6.2 USB4640/USB4640i Buffer Type Descriptions

 

 

 

BUFFER

 

DESCRIPTION

 

 

 

I

 

Input.

 

 

 

I/O

 

Input/output.

 

 

 

IPU

 

Input with weak internal pull-up.

 

 

 

IS

 

Input with Schmitt trigger.

 

 

 

I/O6

 

Input/output buffer with 6 mA sink and 6 mA source.

 

 

 

I/OD6PU

 

Input/open drain output buffer with a 6 mA sink.

 

 

 

O8

 

Output buffer with an 8 mA sink and an 8 mA source.

 

 

 

O8PD

 

Output buffer with an 8 mA sink and an 8 mA source with a weak internal pull-down resistor.

 

 

 

O8PU

 

Output buffer with an 8 mA sink and an 8 mA source with a weak internal pull-up resistor.

 

 

 

I/O8

 

Input/output buffer with an 8 mA sink and an 8 mA source.

 

 

 

I/O8PD

 

Input/output buffer with an 8 mA sink and an 8 mA source with a weak internal pull-down resistor.

 

 

 

I/O8PU

 

Input/output buffer with an 8 mA sink and an 8 mA source with a weak internal pull-up resistor.

 

 

 

O12

 

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

 

 

 

I/O12

 

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

 

 

 

I/O12PD

 

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

 

 

 

I/O200

 

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

 

 

 

ICLKx

 

XTAL clock input.

 

 

 

OCLKx

 

XTAL clock output.

 

 

 

I/O-U

 

Analog input/output as defined in the USB 2.0 Specification.

 

 

 

I-R

 

RBIAS.

 

 

 

SMSC USB4640/USB4640i

21

Revision 1.0 (06-01-09)

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