USB2642T/ML

Specialized Overview

The USB2642T/ML is a single-chip USB 2.0 compliant hub and flash media controller combo solution manufactured by Microchip Technology. It integrates a high-speed hub with two downstream ports and an internal SD/MMC card reader attached to a third port as a compound device. The device supports commercial (0°C to +70°C) and industrial (-40°C to +85°C) temperature ranges. It features PortMap, PortSwap, and PHYBoost programmability for flexible PCB design and signal integrity. The controller supports up to 2TB storage addressability and includes an I2C over USB bridge.

Specialized Feature Summary

• Integrated USB 2.0 hub controller with two exposed high-speed downstream ports and a dedicated flash media interface.
• Programmable PortMap and PortSwap features allow flexible port mapping and differential-pair pin location alignment.
• Supports external SPI ROM or EEPROM for custom firmware execution and configuration of vendor/product IDs.
• Includes an I2C over USB bridge for host-controlled peripheral management.

Specialized Applications

• Desktop and mobile PCs
• Monitors and televisions
• Mobile PC docking stations
• Consumer A/V equipment
• Flash media card readers/writers

Specialized Procurement Notes

Verify the specific suffix 'T' against the manufacturer's current documentation to confirm tape-and-reel packaging status. Ensure the operating environment falls within the specified commercial or industrial temperature limits. Confirm that the system design accommodates the required 24 MHz crystal and necessary bypass capacitors for VDD33 and VDD18 pins.

Specialized Selection Notes

Select this component when a combined USB expansion and SD/MMC card reading capability is required in a single package. Consider the industrial temperature range variant if deployment environments exceed standard commercial limits. Evaluate the need for external SPI configuration memory if custom VID/PID or firmware updates are planned.

Specialized Part Context

The USB2642 series serves as a versatile solution for integrating USB connectivity and flash media access into compact electronic designs. It replaces discrete hub and card reader chips, reducing board space and component count. The device is part of Microchip's broader portfolio of USB interface controllers designed for cost-effective and energy-efficient platform integration.

Specialized Replacement Considerations

Consult official Microchip documentation for verified cross-reference part numbers. Do not substitute with generic USB hubs lacking integrated card reader functionality without verifying protocol compatibility and pinout differences.

Specialized FAQ

How does the USB2642 handle flash media card detection?

The device uses the SD_nCD pin to detect card insertion. This pin is configured as an input with an internal pull-up resistor during reset states.

What is the maximum storage addressability supported?

The USB2642 supports storage addressability of up to 2TB for compatible SDHC and SDXC media formats.

Can the USB2642 operate without an external crystal?

No, the device requires a single 24 MHz crystal connected to XTAL1 and XTAL2 pins, or an external 24 MHz clock source driven into XTAL1.