Ultra Fast USB 2.0 Multi-Format Flash Media Controller

Datasheet

SMSC USB2240/USB2241

17

Revision 2.6 (05-08-08)

DATASHEET

5.2

Buffer Type Descriptions

1.8V PLL

Power

VDD18PLL

34

This pin is the 1.8V Power for the PLL.

+1.8V Filtered analog power for internal PLL. This

pin must have a 1.0

<0.1

Ω) capacitor to VSS.

Ground

VSS

SLUG

Ground Reference

Table 5.2 Buffer Type Descriptions

BUFFER

DESCRIPTION

I

Input.

IPU

Input with internal weak pull-up 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 with FET 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 Defined in USB specification.

I-R

RBIAS.

Table 5.1 USB2240/USB2241 36-Pin QFN Pin Descriptions (continued)

NAME

SYMBOL

36-PIN

QFN

BUFFER

TYPE

DESCRIPTION