AT43301-SC

Overview

The AT43301-SC is a USB hub controller supporting one upstream and four downstream ports, compliant with USB Specification Rev 1.1. It operates on a 5V supply (4.4V to 5.25V) with a typical current consumption of 24mA. The device supports full-speed (12 Mb/s) and low-speed (1.5 Mb/s) data transfers using an internal 6MHz oscillator and PLL. It features port overcurrent monitoring, power switching control, and an on-chip 3.3V regulator. Available in a 24-lead SOIC package, it enables bus-powered or self-powered hub designs.

Feature Summary

• Full compliance with USB Specification Revision 1.1 for reliable protocol communication
• Integrated Serial Interface Engine handling clock/data separation, encoding, and CRC generation
• Supports both bus-powered and self-powered operational modes with external power management
• Includes an on-chip 3.3V regulator and global port overcurrent protection logic

Applications

• Low-cost standalone USB hubs for portable computers
• Expansion hubs connecting standard desktop peripheral devices
• Adding USB connectivity to existing non-USB peripherals such as keyboards

Procurement Notes

Verify the specific ordering suffix 'SC' corresponds to the 24-lead SOIC package variant when sourcing components. Confirm that the supplier provides documentation matching the AT43301 datasheet revision to ensure pinout compatibility. Check for moisture sensitivity levels and storage conditions prior to assembly to maintain component integrity during manufacturing processes.

Selection Notes

Select the AT43301-SC for applications requiring a cost-effective solution for USB 1.1 hubs. Ensure the design accommodates the 24-lead SOIC footprint and includes necessary external components like the 6MHz crystal and filter capacitors. Consider the power mode requirements; bus-powered designs must account for the limited current available from the host, while self-powered designs require appropriate external switching transistors.

Part Context

The AT43301 series serves as a foundational controller for basic USB expansion hardware. The -SC suffix specifically denotes the 24-lead Small Outline Integrated Circuit (SOIC) package version. This contrasts with the -AC variant, which utilizes a 32-lead LQFP package and supports an external 48MHz clock input. The device integrates the hub repeater and controller functions into a single chip to minimize board space and component count.

Replacement Considerations

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