USB4640I-HZH-03

Specialized Overview

The USB4640I-HZH-03 is a Hi-Speed HSIC USB hub and card reader combo solution manufactured by Microchip Technology. It features one upstream port compliant with HSIC 1.0 and two exposed downstream ports compliant with the USB 2.0 Specification. The device integrates a flash media controller internally attached to a third downstream port as a USB compound device, supporting SD, MMC, Memory Stick, and xD-Picture Card formats. It operates on a single external 3.3 V supply with internal regulators providing 1.8 V core voltage. The component supports data rates up to 480 Mb/s and includes an 8051 microprocessor with 64 KB ROM and 9 KB RAM.

Specialized Feature Summary

• Integrates a High-Speed Inter-Chip (HSIC) interface for low-power chip-to-chip connectivity at speeds up to 480 Mb/s.
• Functions as a USB 2.0 hub with two downstream ports and a dedicated flash media reader/writer configured as a compound device.
• Supports multiple flash media formats including Secure Digital, MultiMediaCard, Memory Stick, and xD-Picture Card.
• Includes programmable features such as PortMap for flexible port mapping, PortSwap for differential-pair alignment, and PHYBoost for signal integrity recovery.

Specialized Applications

• 3G/4G handsets, smartphones, and other mobile devices
• Desktop and mobile PCs
• Printers
• GPS navigation systems
• Consumer A/V equipment

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct temperature range and packaging configuration. Confirm that the required I2C or SPI EEPROM components are sourced separately if custom vendor IDs or firmware loading via external memory is intended. Ensure PCB layout adheres to the specified ground pad connection requirements for the QFN package.

Specialized Selection Notes

Select the USB4640 variant for commercial temperature ranges (0°C to +70°C) and the USB4640i variant for industrial temperature ranges (-40°C to +85°C). Consider the need for external configuration memory if customizable product strings or firmware updates are required. Evaluate the PortSwap and PHYBoost features if PCB trace length constraints or signal integrity issues are anticipated in the design.

Specialized Part Context

This component belongs to the USB4640 family of high-speed inter-chip USB hubs. It is designed to replace onboard host and device connections for analog USB bus cables, reducing total power budgets in mobile and industrial products. The device leverages Microchip's technology to deliver industry-leading data throughput in mixed-speed USB environments.

Specialized Replacement Considerations

Public confirmed substitute part numbers: USB4640-HZH-03 (Commercial Temperature Range), USB4640I-1080HN (Industrial Temperature Range, different packaging).