Datasheet

USB 2.0 Hi-Speed Hub Controller
Datasheet
SMSC USB251xB/xBi 11 Revision 2.2 (02-17-12)
DATASHEET
Chapter 3 Pin Information
This chapter outlines the pinning configurations for each package type available, followed by a
corresponding pin list organized alphabetically. The detailed pin descriptions are listed then outlined
by function in Section 3.3: Pin Descriptions (Grouped by Function) on page 19.
3.1 Pin Configurations
The following figures detail the pinouts of the various USB251xB/xBi versions.
Figure 3.1 2-Port 36-Pin QFN
Ground Pad
(must be connected to VSS)
SMSC
USB2512B/12Bi
(Top View QFN-36)
26
VDD33
25
RESET_N
24
HS_IND/CFG_SEL1
23
SCL/SMBCLK/CFG_SEL0
22
SDA/SMBDATA/NON_REM1
21
NC
20
NC
19
VBUS_DET
27
NC
18
NC
17
16
15
14
VDD33
13
CRFILT
12
11
TEST
10
VDDA33
OCS_N2
PRTPWR2/BC_EN2
OCS_N1
PRTPWR1/BC_EN1
28
VDDA33
29
USBDP_UP
31
XTALOUT
32
33
RBIAS
36
VDD33
35
PLLFILT
34
USBDM_UP
30
XTALIN/CLKIN
SUSP_IND/LOCAL_PWR/NON_REM0
VDDA33
1 2 3 4 5
NC
6
NC
7
NC
8
NC
9
USBDM_DN1
USBDP_DN1
USBDM_DN2
USBDP_DN2
Indicates pins on the bottom of the device.