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Microchip Technology USB2642T-I/ML
- Part No.:
- USB2642T-I/ML
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
USB2642T-I/ML.pdf
- Description:
- IC INTERFACE SPECIALIZED 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,819
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Product details
Overview
USB2642T-I/ML from Microchip Technology is a USB 2.0-compliant, single-chip hi-speed hub and flash media controller combo IC supporting 2 downstream USB 2.0 ports, SD/SDHC/SDXC/MMC/eMMC card interface, and I²C-over-USB bridge functionality. It integrates a Transaction Translator (TT), internal 1.8 V regulator support, and delivers sustained flash transfer rates >35 MB/s in desktop docking, media readers, and A/V monitors.
For engineers reviewing the USB2642T-I/ML datasheet, USB2642T-I/ML pinout, USB2642T-I/ML application, or USB2642T-I/ML equivalent, key selection criteria include its dual-role architecture (hub + card reader), 48-pin QFN package with integrated PHYBoost and PortSwap, RoHS-compliant industrial temperature range (–40°C to +85°C), and configurable SPI firmware loading for vendor ID customization.
Technical Context
The USB2642T-I/ML implements a single TT shared across both downstream ports to support concurrent full-speed and low-speed peripherals. Its embedded 8051 processor executes internal ROM or external SPI firmware, enabling runtime configuration of port mapping (PortMap), differential-pair pin location (PortSwap), and transceiver drive strength (PHYBoost).
The flash media interface operates as a USB compound device on a dedicated third downstream port, supporting SD 2.0 (including SDXC up to 2 TB) and MMC 4.2 (1/4/8-bit, eMMC). The I²C-over-USB bridge uses SCSI pass-through commands via Mass Storage Class driver to control external I²C slaves at 50 kHz clock rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Compliance | USB 2.0 hi-speed (480 Mbps); supports FS/LS devices via integrated TT |
| Downstream Ports | 2 exposed hi-speed USB 2.0 ports + 1 internal port for flash media (compound device) |
| Flash Media Support | SD/SDHC/SDXC (up to 2 TB), MMC/eMMC (1/4/8-bit), microSD, reduced form factor |
| Sustained Transfer Rate | >35 MB/s - enables real-time HD video transfer from SDXC cards |
| I²C Bridge Clock | 50 kHz - compatible with standard I²C slave timing without host-side clock stretching mitigation |
| Core Voltage | 1.8 V (internally or externally regulated) - reduces power consumption vs. 3.3 V core designs |
| Crystal Frequency | 24 MHz - single crystal eliminates need for external oscillator or clock generator |
Pinout & Package
USB2642T-I/ML is housed in a 48-pin, 7×7 mm² QFN package with exposed thermal pad (VSS). All USB termination and pull-up/down resistors are integrated, eliminating 12 external passive components per port.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| USBDN_DP2 / USBDN_DM2 | Downstream USB Port 2 Data | Differential pair for Port 2; supports PortSwap for direct connector alignment |
| USBDN_DP3 / USBDN_DM3 | Downstream USB Port 3 Data | Internal port dedicated to flash media interface (compound device) |
| PRTCTL2 / PRTCTL3 | Port Power Control | Open-drain outputs driving external FETs; enable individual or ganged port power |
| CRD_PWR | Card Power Drive | 200 mA 3.3 V output for SD/MMC slot - eliminates need for external LDO |
| SD_D[7:0], SD_CMD, SD_CLK, SD_nCD, SD_WP | Secure Digital Interface | Full 8-bit SD bus with card detect and write-protect - supports hot-plug detection |
| SCL / SDA | I²C Master Interface | 2-pin I²C bus for external slave control over USB - no additional USB endpoints required |
| SPI_CE_N, SPI_CLK, SPI_DI, SPI_DO | SPI Firmware Interface | Configurable boot from external SPI Flash (1 Mbit min., 60 MHz capable) |
Key Features
| Feature | Design Value |
|---|---|
| PortSwap | Per-port programmable D+/D− pin assignment - eliminates PCB trace crossing and length mismatch |
| PHYBoost | 4-level adjustable USB transceiver drive strength - restores eye diagram integrity in marginal layouts |
| PortMap | Flexible port disable/reordering - maintains USB host port numbering consistency across platform variants |
| Integrated Power Switching | On-chip port power control logic - removes need for discrete power switches and current-sense amps |
| Compound Device Architecture | Flash media appears as separate USB MSC device on Port 3 - no host driver modification needed |
Applications
| Desktop Docking Stations | Multi-Format Card Readers |
|---|---|
Use Scenario: Adds USB expansion and SD/microSD/eMMC read/write capability to laptop docking solutions. IC Role / Device Role / Timing Role: Acts as USB hub + flash media controller combo; provides TT-based scheduling for mixed-speed peripherals. Use Value: Reduces BOM count by integrating hub, card reader, and I²C bridge into one die - cuts PCB area by ~35% vs. discrete solution. |
Use Scenario: Enables standalone USB-connected readers supporting SD, SDHC, SDXC, MMC, and eMMC in consumer electronics. IC Role / Device Role / Timing Role: Functions as compound USB device: hub class + mass storage class (for media) + custom class (for I²C bridge). Use Value: Delivers >35 MB/s sustained throughput - meets UHS-I speed class requirements for 4K video capture playback. |
| Smart Monitors & TVs | A/V Media Players |
Use Scenario: Provides USB host port expansion and SD card playback capability in display-integrated media hubs. IC Role / Device Role / Timing Role: Serves as USB 2.0 hub with embedded flash interface; handles simultaneous USB HID (keyboard/mouse) and MSC traffic. Use Value: Supports 2 TB SDXC addressability - enables playback of multi-hour 1080p/4K content directly from high-capacity cards. |
Use Scenario: Integrates flash media access and peripheral control (e.g., display backlight, sensor config) in portable media players. IC Role / Device Role / Timing Role: Hosts I²C-over-USB bridge to manage external sensors or power ICs without adding MCU GPIO overhead. Use Value: Uses standard Mass Storage Class driver - avoids custom driver development and enables plug-and-play I²C slave control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB hub and flash media controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| USB2514B-AIZM | 4-port USB 2.0 hub only; no integrated flash media or I²C bridge | Requires external SD controller and I²C master; higher BOM cost and layout complexity | Choose when only hub expansion is needed and flash/I²C functions are handled elsewhere |
| GL827L-QLF | 2-port hub + SD/MMC reader; lacks I²C-over-USB bridge and PortSwap/PHYBoost features | Supports basic SD/SDHC but not SDXC (2 TB) or eMMC; no programmable signal integrity tuning | Choose for cost-sensitive, non-industrial applications where advanced configurability is unnecessary |
Compared with USB2642T-I/ML, USB2514B-AIZM requires external components to achieve flash and I²C functionality, while GL827L-QLF omits SDXC support and signal integrity tuning - making USB2642T-I/ML the only option delivering integrated 2 TB media access, I²C bridging, and layout-optimized USB routing in a single 48-pin QFN.
Availability
USB2642T-I/ML is available at Aetrix Electronics and suitable for desktop docking stations, multi-format card readers, and smart monitors requiring stable component supply, industrial temperature operation, and long-term lifecycle support.
Supply support for USB2642T-I/ML includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog, FPGA, and connectivity solutions for industrial, automotive, and consumer markets.
USB2642T-I/ML belongs to Microchip's USB connectivity product line, designed to reduce system complexity by integrating hub, flash media controller, and I²C bridge functions into a single chip for compact, power-efficient peripheral interfaces.
FAQ
What is the maximum SD card capacity supported by USB2642T-I/ML?
USB2642T-I/ML supports storage addressability of up to 2 TB, fully compliant with SDXC specification. This enables direct read/write of high-resolution video files and large datasets from SDXC cards without host-side partitioning constraints. The 2 TB limit is enforced by the internal FAT32/exFAT handling logic and matches SD Association v3.01 requirements.
Does USB2642T-I/ML require an external crystal?
Yes, USB2642T-I/ML requires a 24 MHz crystal connected between XTAL1 and XTAL2 pins. An external clock source may substitute for XTAL1, but XTAL2 must be left unconnected in that case. The crystal tolerance must be ≤±50 ppm to meet USB 2.0 hi-speed timing jitter requirements across temperature and voltage ranges.
How does the I²C-over-USB bridge function in USB2642T-I/ML?
USB2642T-I/ML implements I²C-over-USB using SCSI pass-through commands routed through its Mass Storage Class interface. Host software issues Write_I2C_Stream or WriteRead_I2C_Stream commands to control external I²C slaves at 50 kHz. No custom driver is needed - standard OS mass storage drivers handle the transport layer transparently.
Can USB2642T-I/ML operate with an externally regulated 1.8 V supply?
Yes, USB2642T-I/ML supports both internally and externally regulated 1.8 V core operation. When REG_EN is pulled low, VDD18 and VDD18PLL become power inputs (not bypass-only), allowing use of an external 1.8 V LDO. Internal regulators remain disabled, reducing quiescent current by ~1.2 mA compared to internal regulation mode.
What package type and lead finish does USB2642T-I/ML use?
USB2642T-I/ML uses a 48-pin QFN package (7×7 mm² body, 0.5 mm pitch) with exposed thermal pad. The lead finish is matte tin, RoHS-compliant and compatible with standard SnPb and lead-free reflow profiles. Pin 1 marking is a dot adjacent to corner pad; thermal pad must be soldered to ground plane with ≥4 vias for thermal and electrical integrity.
USB2642T-I/ML Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller
- Interface:
- USB
- Voltage - Supply:
- 3.3V
- Supplier Device Package:
- 48-QFN (7x7)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
USB2642T-I/ML FAQ
1.How can I place an order for USB2642T-I/ML through Aetrix?
Please submit a Request for Quotation (RFQ) for USB2642T-I/ML on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for USB2642T-I/ML reliable?
The price and inventory of USB2642T-I/ML are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for USB2642T-I/ML is usually 5 days.
3.What payment methods are accepted for USB2642T-I/ML?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for USB2642T-I/ML transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for USB2642T-I/ML?
USB2642T-I/ML orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your USB2642T-I/ML order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for USB2642T-I/ML?
For technical support, including USB2642T-I/ML datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your USB2642T-I/ML requirements.
6.How does Aetrix verify that USB2642T-I/ML is sourced from the original manufacturer or authorized distributors?
All USB2642T-I/ML products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that USB2642T-I/ML meets industry standards.
7.What is the process for return or replacement of USB2642T-I/ML?
All USB2642T-I/ML units undergo pre-shipment inspection (PSI). If there is an issue with USB2642T-I/ML, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The USB2642T-I/ML part is unused and in its original packaging.
Return procedure for USB2642T-I/ML:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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