USB2504 SMSC Corporation, USB2504 Datasheet - Page 10

• Manufacturer Part Number: USB2504
• Description: Integrated USB 2.0 Compatible 4-Port Hub
• Manufacturer: SMSC Corporation

Chapter 4 4-Port Hub Block Diagram
Revision 2.1 (12-06-06)
Detect Upstream
USB Bus Data
VBUS Power
NAME
VBUS_DET
SYMBOL
USBDN0
USBDP0
Downstream
Downstream
USB Data
Upstream
Upstream
USB Data
Repeater
PHY #1
PHY
Table 4.1 4-Port Hub Pin Descriptions
Upstream
Sense
Power
Detect
UPSTREAM USB 2.0 INTERFACE
V
V
Figure 4.1 4-Port Block Diagram
OC
Switch Driver
BUS
LED Drivers
BUS
OC Sense
Routing Logic
TYPE
I/O12
Port #1
IO-U
Switch/LED
Drivers
24 MHz
Crystal
DATASHEET
PLL
TT
#1
These pins connect to the upstream USB bus data signals.
Detects state of Upstream VBUS power. The SMSC Hub
monitors VBUS_DET to determine when to assert the
internal D+ pull-up resistor (signalling a connect event).
When designing a detachable hub, this pin must be
connected to the VBUS power pin of the USB port that is
upstream of the hub. (Use of a weak pull-down resistor is
recommended.)
For self-powered applications with a permanently attached
host, this pin must be pulled-up to either 3.3V or 5.0V
(typically VDD33).
...
10
TT
#2
3.3V
Reg.
1.8V
SIE
Downstream
Downstream
USB Data
TT
#3
PHY #4
1.8V
Cap
TT
#4
Strapping
Options
Defaults
Internal
Select
Pin
Sense
Switch Driver
OC
LED Drivers
Controller
Controller
OC Sense
Port #4
Port
Integrated USB 2.0 Compatible 4-Port Hub
Switch/LED
FUNCTION
EEPROM
or SMBus
Interface
Drivers
Master
Serial
SD
To
SCL
SMSC USB2504/USB2504A
Datasheet