Integrated USB 2.0 Compatible 3-Port Hub

Datasheet

Revision 2.1 (12-06-06)

6

SMSC USB2503/USB2503A

DATASHEET

Chapter 1 General Description

The SMSC 3-Port Hub is fully compliant with the USB 2.0 Specification and will attach to a USB host

as a Full-Speed Hub or as a Full-/High-Speed Hub. The 3-Port Hub supports Low-Speed, Full-Speed,

and High-Speed (if operating as a High-Speed Hub) downstream devices on all of the enabled

downstream ports.

A dedicated Transaction Translator (TT) is available for each downstream facing port. This architecture

ensures maximum USB throughput for each connected device when operating with mixed-speed

peripherals.

downstream ports, and to limit current and sense over-current conditions.

All required resistors on the USB ports are integrated into the Hub. This includes all series termination

resistors on D+ and D– pins and all required pull-down and pull-up resistors on D+ and D– pins. The

over-current sense inputs for the downstream facing ports have internal pull-up resistors.

Throughout this document the upstream facing port of the hub will be referred to as the upstream port,

and the downstream facing ports will be called the downstream ports.

1.1

OEM Selectable Features

A default configuration is available in the USB2503/USB2503A following a reset. This configuration

may be sufficient for some applications. Strapping option pins make it possible to modify a limited sub-

set of the configuration options.

The USB2503/USB2503A may also be configured by an external EEPROM or a microcontroller. When

using the microcontroller interface, the Hub appears as an SMBus slave device. If the Hub is pin-

strapped for external EEPROM configuration but no external EEPROM is present, then a value of ‘0’

will be written to all configuration data bit fields (the hub will attach to the host with all ‘0’ values).

The 3-Port Hub supports several OEM selectable features:

Operation as a Self-Powered USB Hub or as a Bus-Powered USB Hub.

Operation as a Dynamic-Powered Hub (Hub operates as a Bus-Powered device if a local power

source is not available and switches to Self-Powered operation when a local power source is

available).

Multiple Transaction Translator (Multi-TT) or Single-TT support.

Optional OEM configuration via I2C EEPROM or via the industry standard SMBus interface from

an external SMBus Host.

Port power switching on an individual or ganged basis.

Port over-current monitoring on an individual or ganged basis.

Compound device support (port is permanently hardwired to a downstream USB peripheral device).

Hardware strapping options enable configuration of the following features.

Non-Removable Ports

Port Power Polarity (active high or active low logic)

Port Disable

Ganged Vs Port power switching and over-current sensing