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USB2504A

Integrated USB 2.0 Compatible 4-Port Hub

SMSC -> Microchip 

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Chapter 4 4-Port Hub Block Diagram

Upstream Upstream 24 MHz

USB Data VBUS Crystal

3.3V

To

Pin EEPROM

1.8V Strapping or SMBus

Cap Options Master

SD SCL

VBUS

Upstream Power

PLL

1.8V

Reg.

PHY

Detect

Repeater

SIE

Internal

Defaults

Select

Serial

Interface

Controller

TT TT TT TT

#1 #2 #3 #4

Port

Controller

Routing Logic

... Port #1

Downstream OC Sense

Port #4

Downstream OC Sense

PHY #1 Switch Driver

PHY #4 Switch Driver

LED Drivers

LED Drivers

Downstream OC Switch/LED

USB Data Sense Drivers

Downstream OC Switch/LED

USB Data Sense Drivers

Figure 4.1 4-Port Block Diagram

NAME

USB Bus Data

Detect Upstream

VBUS Power

Table 4.1 4-Port Hub Pin Descriptions

SYMBOL

TYPE

FUNCTION

USBDN0

USBDP0

VBUS_DET

UPSTREAM USB 2.0 INTERFACE

IO-U

These pins connect to the upstream USB bus data signals.

I/O12

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).

Revision 2.3 (08-27-07)

10

DATASHEET

SMSC USB2504/USB2504A

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