AT43312A-AC

Overview

The AT43312A-AC is a self- and bus-powered USB hub controller supporting one upstream and four downstream ports. It complies with USB Specification Rev 1.1, enabling full-speed (12 Mb/s) and low-speed (1.5 Mb/s) data transfers. The device operates on a 5V supply (4.4V to 5.25V) with a maximum supply current of 24mA. An internal oscillator runs at 6MHz, while an on-chip PLL generates the necessary 48MHz clock for high-speed operations. The component includes an integrated 3.3V regulator, eliminating the need for external voltage generation.

Feature Summary

• Supports both bus-powered and self-powered hub configurations via hardware pin selection
• Provides individual port power switching and per-port overcurrent monitoring capabilities
• Integrates an on-chip 3.3V regulator to simplify system design
• Includes dedicated status indicator outputs for visual connection feedback

Applications

• Standalone USB hubs connecting multiple peripherals to a host
• Add-on hubs for non-USB peripherals such as PC displays or keyboards
• Industrial control systems requiring robust USB connectivity expansion

Procurement Notes

Verify the specific ordering suffix against official Microchip Technology documentation to confirm package type and temperature range. Ensure that the selected variant matches the required lead time and availability constraints for your production schedule. Cross-reference the datasheet revision number to guarantee compatibility with your design specifications.

Selection Notes

Select this component when designing a cost-effective USB hub compliant with USB 1.1 standards. Consider the 32-lead SOIC or LQFP packages based on available PCB space and thermal requirements. Evaluate whether bus-powered or self-powered operation better suits the target application's power budget and device load requirements.

Part Context

Manufactured by Microchip Technology, the AT43312A belongs to the family of USB hub controllers designed for low-cost implementations. It serves as a bridge between a host/root hub and downstream devices, managing enumeration and data flow. This chip is suitable for applications prioritizing functional reliability and standard compliance over high-speed data transfer rates.

Replacement Considerations

The AT43301-A is a documented alternative within the same product family offering similar functionality in different package options.