USB3503 datasheet(14/82 Pages) SMSC

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USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3503A

Revision 1.1 (02-07-13)

DATASHEET

3.3

Pin Descriptions

This section provides a detailed description of each signal. The signals are arranged in functional

groups according to their associated interface.

The terms assertion and negation are used. This is done to avoid confusion when working with a

mixture of “active low” and “active high” signal. The term “assert”, or “assertion” indicates that a signal

is active, independent of whether that level is represented by a high or low voltage. The term “negate”,

or “negation” indicates that a signal is inactive.

3.3.1

Pin Definition

Table 3.1 Pin Descriptions

NAME

SYMBOL

TYPE

DESCRIPTION

UPSTREAM HIGH SPEED INTER-CHIP INTERFACE

HSIC Clock/Strobe

STROBE

I/O

HSIC Upstream Hub Strobe pin

HSIC Data

DATA

I/O

HSIC Upstream Hub Data pin

High-Speed USB Data

Port Disable Strap Option

USBDN_DP[2:1]

USBDN_DM[2:1]

A-I/O

These pins connect to the downstream USB

peripheral devices attached to the hub’s ports

Downstream Port Disable Strap option:

This pin will be sampled at RESET_N negation to

determine if the port is disabled.

Both USB data pins for the corresponding port

must be tied to VDD33_BYP to disable the

associated downstream port.

HS USB Data

USBDN_DP[3]

USBDN_DM[3]

A-I/O

These pins connect to the downstream USB

peripheral devices attached to the hub’s ports.

There is no downstream Port Disable Strap

option on these ports.

SERIAL PORT INTERFACE

Serial Data

SDA

I/OD

I2C Serial Data

Serial Clock

SCL

Serial Clock (SCL)

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