USB2512 datasheet(12/72 Pages) SMSC

12 / 72 page

USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 1.0 (3-11-09)

SMSC USB251x

DATASHEET

Chapter 5 Pin Descriptions

This chapter is organized by a set of pin configurations (organized by package type) followed by a

corresponding pin list organized alphabetically. A comprehensive and detailed description list of each

signal (named in the pin list) is organized by function in Table 5.2, “USB251x Pin Descriptions,” on

page 22. Please refer to Table 5.3, “Buffer Type Descriptions,” on page 27 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.

5.1

Pin Configurations and Lists (Organized by Package Type)

Figure 5.1 2-Port 36-Pin QFN

Note: *Battery charging enable (BC_EN) is only available in the USB251xB/Bi.

Ground Pad

(must be connected to VSS)

SMSC

USB2512/12A/12B

USB2512i/12Ai/12Bi

(Top View QFN-36)

OCS_N[2]

PRTPWR[2] / BC_EN[2]*

OCS_N[1]

VDD33

CRFILT

PRTPWR[1] / BC_EN[1]*

TEST

VDD33

SUSP_IND / LOCAL_PWR / NON_REM[0]

VDD33

USBDP_UP

XTALOUT

XTALIN / CLKIN

RBIAS

VDD33

PLLFILT

USBDM_UP

Indicates pins on the bottom of the device.

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