USB4640-HZH-03

Specialized Overview

The Microchip Technology USB4640-HZH-03 is a High-Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller combo solution. It features one upstream HSIC port compliant with HSIC 1.0 and two exposed Hi-Speed USB 2.0 downstream ports for external peripheral expansion. A dedicated flash media reader/writer is internally attached to a third downstream port as a USB compound device. The device supports SD, MMC, Memory Stick, and xD-Picture Card formats. It operates on a single 3.3 V supply with an internal regulator providing 1.8 V core voltage. The component is housed in a 48-pin QFN package measuring 7 x 7 mm.

Specialized Feature Summary

• Integrates an HSIC hub and multi-format flash media controller into a single chip solution.
• Includes programmable PortMap, PortSwap, and PHYBoost features for flexible PCB design and signal integrity recovery.
• Supports configuration via external I2C EEPROM or SPI Flash ROM for customizable vendor and product IDs.
• Features up to 9 configurable GPIOs and enhanced EMI rejection with ESD protection.

Specialized Applications

• 3G/4G handsets, smartphones, and mobile devices
• Desktop and mobile PCs
• Printers and GPS navigation systems
• Media players/viewers and consumer A/V equipment

Specialized Procurement Notes

Verify the specific suffix of the part number against the manufacturer's datasheet to confirm the firmware revision level and temperature range. Ensure the ordering suffix matches the required commercial or industrial operating conditions. Confirm package type availability, such as tray or tape and reel options, directly with authorized distributors or the manufacturer before placing orders.

Specialized Selection Notes

Select the USB4640 variant for commercial temperature ranges (0°C to +70°C) or the USB4640i variant for industrial ranges (-40°C to +85°C). Consider the need for HSIC connectivity versus standard USB cables when choosing this inter-chip solution. Evaluate the requirement for onboard flash media support to determine if the combo functionality is necessary for the target application design.

Specialized Part Context

This component belongs to the SMSC USB4640 family, now managed by Microchip Technology following acquisition. It serves as a bridge between host processors using HSIC interfaces and standard USB peripherals or flash memory cards. The device simplifies system architecture by combining hub switching and card reading capabilities, reducing board space and component count compared to discrete solutions.

Specialized Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Microchip Technology for current equivalent products or updated series replacements that maintain HSIC compatibility and pinout requirements.