USB2504 Series
Manufacturer: Microchip Technology
Catalog
Key Features
• Compliant with USB 2.0 Specification
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• Hub Controller IC with Four Downstream Ports
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• MultiTRAK Technology Provides One Transaction Translator Per Port
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• Default Configuration with Pin Selectable Options
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• Flexible OEM Configuration Options
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• 64-Pin TQFP RoHS compliant package
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• Integrated 1.8V regulator
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• Integrated Termination and Pull-Up/Pull-Down Resistors
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• Internal Short Circuit Protection of DP and DM Lines
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• On-Chip Oscillator Uses Low Cost 24MHz Crystal
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• Supports Ganged or Individual Over-Current Protection and Power Control
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• 3.3V I/O with 5V tolerance
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• Pin-to-pin Compatible with USB20H04
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• Customize Vendor ID, Product ID, and Device ID
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• Select whether the hub is part of a compound device (When any downstream port is permanently hardwired to a USB peripheral device, the hub is part of a compound device)
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• Select the presence of a permanently hardwired USB peripheral device on a port by port basis
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• Configure the delay time for filtering the over-current sense inputs
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• Configure the delay time for turning on downstream port power
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• Configure the polarity of down stream port power control signals
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• Indicate the maximum current that the 4-port hub consumes from the USB upstream port
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• Indicate the maximum current required for the hub controller
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• Select Downstream Ports as Non-Removable Ports
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• Select Downstream Ports as Disabled Ports
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• Enable/Disable Downstream Port LED Indicators
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• Select Downstream Port Power Control and Over-Current Detection on a Ganged or Individual Basis
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• Select Downstream Port Power Control Polarity
Description
AI
The USB2504 4-port hub controller is fully compliant with the USB 2.0 Specification and does not require firmware development. When connected to a USB high-speed host, the four downstream ports can operate at low-speed (1.5Mb/s), full-speed (12Mb/s), or high-speed (480Mb/s). As required by the USB 2.0 Specification, the USB2504 is fully backward compatible with legacy USB full-speed hosts.
A default configuration is available in the USB2504 following a reset. This configuration may be sufficient for some applications when it is desired to save the expense of an EEPROM. The controller may be configured from a microcontroller or an external EEPROM. When using the microcontroller interface, the USB2504 appears as a SMBus slave device. The EEPROM interface supports a 2-wire I²C device.
All required resistors on the USB ports are integrated into the USB2504. 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 ports have internal pull-up resistors.
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