USB2503 datasheet(9/43 Pages) SMSC

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Integrated USB 2.0 Compatible 3-Port Hub

Datasheet

SMSC USB2503/USB2503A

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

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 #3

Port #3

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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