USB 2.0 Hi-Speed Hub Controller

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.

5.1Pin Configurations and Lists (Organized by Package Type)

NC

NC

NC

SDA / SMBDATA / NON_REM[1]

VDD33

SCL / SMBCLK / CFG_SEL[0]

HS_IND / CFG_SEL[1]

RESET_N

VBUS_DET

 

27

26

25

24

23

22

21

20

19

 

SUSP_IND / LOCAL_PWR / NON_REM[0]

28

 

 

 

 

 

 

 

18

NC

VDD33

29

 

 

 

 

 

 

 

17

OCS_N[2]

USBDM_UP

30

 

 

SMSC

 

 

16

PRTPWR[2] / BC_EN[2]*

USBDP_UP

31

 

 

 

 

15

VDD33

USB2512/12A/12B

XTALOUT

32

14

CRFILT

USB2512i/12Ai/12Bi

XTALIN / CLKIN

33

13

OCS_N[1]

(Top View QFN-36)

PLLFILT

34

12

PRTPWR[1] / BC_EN[1]*

 

 

Ground Pad

 

 

RBIAS

35

 

 

 

 

11

TEST

(must be connected to VSS)

 

 

 

 

VDD33

36

 

 

 

 

 

 

 

10

VDD33

 

1 2 3 4 5 6 7 8 9

 

 

USBDM_DN[1]

USBDP_DN[1]

USBDM_DN[2]

USBDP_DN[2]

VDD33

NC

NC

NC

NC

 

Indicates pins on the bottom of the device.

Figure 5.1 2-Port 36-Pin QFN

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

Revision 1.0 (3-11-09)

12

SMSC USB251x

DATASHEET