AT43301-SU

Overview

The AT43301-SU is a USB hub controller supporting one upstream and four downstream ports, compliant with USB Specification Rev 1.1. It facilitates full-speed (12 Mb/s) and low-speed (1.5 Mb/s) data transfers using a 6 MHz oscillator and internal PLL. The device operates on a 4.4 V to 5.25 V supply, consuming 24 mA. It supports bus-powered or self-powered modes, featuring an on-chip 3.3V regulator and port power switching controlled via the PWR pin. Overcurrent conditions are monitored through the OVC pin. The component is housed in a 24-lead SOIC package.

Feature Summary

• Full compliance with USB Specification Rev 1.1 for reliable protocol communication
• Integrated Serial Interface Engine handling clock/data separation and CRC generation
• Supports both bus-powered and self-powered hub configurations
• Includes on-chip 3.3V regulator and global overcurrent protection monitoring

Applications

• Low-cost standalone USB hubs for portable computers
• Adding USB connectivity to existing non-USB peripherals like keyboards
• Bus-powered expansion hubs requiring minimal external components

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. Confirm RoHS compliance status as required by project specifications. Ensure the procurement channel provides valid traceability for the Microchip Technology part number. Check for any end-of-life notifications or obsolescence warnings prior to finalizing orders.

Selection Notes

Select this component for applications requiring a cost-effective solution for expanding USB connectivity. The AT43301-SU is suitable for designs needing four downstream ports with support for both full-speed and low-speed devices. Consider the 24-lead SOIC package constraints during PCB layout. Evaluate power requirements carefully, as bus-powered mode limits available current per port compared to self-powered operation.

Part Context

The AT43301 series includes variants such as the AT43301-AC, which utilizes a 32-lead LQFP package and supports a 48 MHz external clock input. The AT43301-SU specifically denotes the 24-lead SOIC version designed for standard 6 MHz crystal operation. This family of controllers integrates the hub repeater and controller logic into a single chip to simplify system design.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.