AT43USB325E-AU

Overview

The AT43USB325E-AU is an 8-bit microcontroller based on the AVR RISC architecture, featuring a 64-lead LQFP package. It integrates a USB hub with one attached function and four external ports, alongside a USB keyboard controller with four programmable endpoints. The device includes 16 KB of downloadable SRAM for program memory and 512 bytes of data SRAM. It operates at 5V with an internal 3.3V supply and utilizes a 6-MHz oscillator with an on-chip PLL to generate a 12 MHz system clock.

Feature Summary

• AVR 8-bit RISC core with 83 ns instruction cycle time
• Integrated USB Hub with one embedded function and four external ports
• 16 KB downloadable SRAM program memory loaded from external serial EEPROM
• 42 programmable I/O pins supporting 20x8 keyboard matrix

Applications

• Multimedia USB keyboards
• USB keyboard controllers with embedded hubs
• Consumer page USB devices

Procurement Notes

Verify component status as discontinued. Confirm availability through authorized distributors or secondary markets. Ensure the external serial EEPROM interface requirements are met for firmware loading during power-on reset sequences.

Selection Notes

Select the AT43USB325E variant when firmware flexibility via external serial EEPROM is required. Choose the AT43USB325M version for fixed masked ROM applications. Both variants are pin, function, and binary compatible.

Part Context

This component belongs to the AT43USB series of multimedia USB controllers. It shares architectural similarities with the AT90S8515 but adds dedicated USB hub and keyboard controller peripherals. The 'E' suffix denotes the downloadable SRAM version, while 'M' indicates masked ROM.

Replacement Considerations

The AT43USB325M is a binary compatible alternative with masked ROM instead of downloadable SRAM. No other direct substitutes are documented in the provided source material.