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USB2503 Datasheet(PDF) 6 Page - SMSC Corporation

Part No. USB2503
Description  Integrated USB2.0 Compatible 3-Port Hub
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Maker  SMSC [SMSC Corporation]
Homepage  http://www.smsc.com
Logo SMSC - SMSC Corporation

USB2503 Datasheet(HTML) 6 Page - SMSC Corporation

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Integrated USB 2.0 Compatible 3-Port Hub
Revision 2.1 (12-06-06)
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
The Hub works with an external USB power distribution switch device to control VBUS switching to
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.
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
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

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