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Integrated USB 2.0 Compatible 3-Port Hub
Datasheet
SMSC USB2503/USB2503A 9 Revision 2.3 (08-27-07)
DATASHEET
Chapter 4 3-Port Hub Block Diagram
Figure 4.1 3-Port Block Diagram
Table 4.1 3-Port Hub Pin Descriptions
NAME SYMBOL TYPE FUNCTION
UPSTREAM USB 2.0 INTERFACE
USB Bus Data USBDN0
USBDP0
IO-U These pins connect to the USB bus data signals.
Detect Upstream
VBUS Power
VBUS_DET I/O12 Detects state of Upstream VBUS power (indicates the
power-managed state of the upstream device).
Upstream
V
BUS
Upstream
PHY
Upstream
USB Data
Repeater
Controller
SIE
Serial
Interface
PLL
24 MHz
Crystal
To
EEPROM
or SMBus
Master
Routing Logic
SCLSD
TT
#1
TT
#2
TT
#3
Port
Controller
Downstream
PHY #1
Port #1
OC Sense
Switch Driver
LED Drivers
Downstream
PHY #3
Port #3
OC Sense
Switch Driver
LED Drivers
...
Downstream
USB Data
OC
Sense
Switch/LED
Drivers
Downstream
USB Data
OC
Sense
Switch/LED
Drivers
V
BUS
Power
Detect
Pin
Strapping
Options
Internal
Defaults
Select
3.3V
1.8V
Reg.
1.8V
Cap