USB2504A datasheet(10/46 Pages) SMSC

10 / 46 page

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Revision 2.3 (08-27-07)

SMSC USB2504/USB2504A

DATASHEET

Chapter 4 4-Port Hub Block Diagram

Figure 4.1 4-Port Block Diagram

Table 4.1 4-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 upstream USB bus data signals.

Detect Upstream

VBUS Power

VBUS_DET

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).

Upstream

BUS

Upstream

PHY

Upstream

USB Data

Repeater

Controller

SIE

Serial

Interface

PLL

24 MHz

Crystal

EEPROM

or SMBus

Master

Routing Logic

SCL

Port

Controller

Downstream

PHY #1

Port #1

OC Sense

Switch Driver

LED Drivers

Downstream

PHY #4

Port #4

OC Sense

Switch Driver

LED Drivers

...

Downstream

USB Data

Sense

Switch/LED

Drivers

Downstream

USB Data

Sense

Switch/LED

Drivers

BUS

Power

Detect

Strapping

Options

Internal

Defaults

Select

3.3V

1.8V

Reg.

1.8V

Cap

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