2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 1.3 (12-27-11)

8

SMSC USB2412

DATASHEET

Chapter 2 Pin Descriptions

This chapter is organized by a set of pin configurations followed by a corresponding pin list organized

by function according to their associated interface. A detailed description list of each signal (named in

the pin list) is organized by function in Table 2.2, “USB2412 Pin Descriptions,” on page 10. Refer to

Table 2.3, “Buffer Type Descriptions,” on page 12 for a list of buffer types.

The “N” symbol in the signal name indicates that the active, or asserted, state occurs when the signal

is at a low voltage level. When “N” is not present after the signal name, the signal is asserted when it

is at the high voltage level.

The terms assertion and negation are used exclusively. This is done to avoid confusion when working

with a mixture of “active low” and “active high” signals. The term assert, or assertion, indicates that a

signal is active, independent of whether that level is represented by a high or low voltage. The term

negate, or negation, indicates that a signal is inactive.

2.1

Pin Configuration

Figure 2.1 USB2412 28-Pin QFN

Ground Pad

(must be connected to VSS)

SMSC

USB2412

(Top View QFN-28)

XTALOUT

23

XTALIN/CLKIN

24

USBDP_UP

22

PLLFILT

25

RBIAS

26

USBDM_DN1

28

VDD33

27

14

VDD33

13

NON_REM1

12

VDD33

11

OCS_N2

10

PRTPWR2

9

CRFILT

8

OCS_N1

Indicates pins on the bottom of the device.