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Microchip Technology USB4640-HZH-03
- Part No.:
- USB4640-HZH-03
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
USB4640-HZH-03.pdf
- Description:
- IC INTERFACE SPECIALIZED 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,520
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Product details
Overview
USB4640-HZH-03 from Microchip (formerly SMSC) is a single-chip High-Speed Inter-Chip (HSIC) USB 2.0 hub and integrated flash media controller supporting SD 2.0, MMC 4.2, Memory Stick 1.43, MS-Pro 1.02, MS-Pro-HG 1.01, MS-Duo 1.10, and xD-Picture Card 1.2. It features one HSIC upstream port compliant with HSIC 1.0, two exposed Hi-Speed USB 2.0 downstream ports, and a third internally attached downstream port dedicated to flash media read/write operations as a USB compound device. It operates across the industrial temperature range (−40°C to +85°C) in a 48-pin QFN package.
For engineers reviewing the USB4640-HZH-03 datasheet, USB4640-HZH-03 pinout, USB4640-HZH-03 application, or USB4640-HZH-03 equivalent, this page delivers verified technical context, validated pin functions, confirmed flash media protocol support, sustained throughput data (>35 MB/s), and real-world OEM configuration capabilities including PortMap, PortSwap, and PHYBoost - all specific to the USB4640-HZH-03 variant.
Technical Context
The USB4640-HZH-03 integrates an 8051-based microcontroller (60 MHz, 64 KB ROM, 9 KB RAM) that manages both HSIC-to-USB protocol translation and multi-format flash media control logic. Its HSIC interface uses DDR signaling on HSIC_DAT/HSIC_STROBE with programmable 40 Ω / 50 Ω driver impedance via HSIC_IMP, enabling low-power chip-to-chip interconnect at 480 Mb/s without analog PHY overhead.
Internally, the device routes USB transactions through a transaction translator (TT) supporting Low-Speed and Full-Speed peripherals on all enabled downstream ports, while its flash media subsystem supports simultaneous SD/MMC/MS/xD command decoding and data transfer via dedicated parallel I/O pins - not shared with USB physical layers. All USB series termination and pull-up/down resistors are integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Upstream Interface | HSIC 1.0-compliant, 480 Mb/s DDR bus using HSIC_DAT/HSIC_STROBE signals |
| Downstream USB Ports | 2 exposed Hi-Speed USB 2.0 ports + 1 internal compound-device port for flash media |
| Flash Media Support | SD 2.0/SD-HS/SD-HC, MMC 4.2 (1/4/8-bit), MS 1.43/MS-Pro 1.02/MS-Pro-HG 1.01/MS-Duo 1.10, xD 1.2 |
| Operating Temperature | Industrial grade: −40°C to +85°C - validated for mobile handset, GPS, and industrial embedded use |
| Power Supply | Single 3.3 V input; internal 1.8 V core regulator eliminates need for external 1.8 V rail |
| Memory Resources | 64 KB on-chip ROM (firmware), 9 KB RAM (data/stack), plus configurable external SPI/I²C EEPROM support |
| GPIO Capability | Up to 9 configurable GPIOs; one supports 200 mA drive with fold-back short-circuit protection |
Pinout & Package
USB4640-HZH-03 is housed in a 48-pin QFN package (7 mm × 7 mm, 0.5 mm pitch), lead-free and RoHS compliant, with exposed thermal pad requiring connection to VSS for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HSIC_DAT (Pin 42) | Bi-directional DDR data line | Synchronous to HSIC_STROBE; carries multiplexed upstream control/data traffic per HSIC 1.0 spec |
| HSIC_STROBE (Pin 43) | Bi-directional DDR strobe | Edge-aligned clock signal for HSIC_DAT; enables deterministic timing without separate clock trace |
| HSIC_IMP (Pin 39) | Impedance control input | Selects 40 Ω (logic 0) or 50 Ω (logic 1) output driver impedance for HSIC_DAT/STROBE |
| USBDN_DP2 / USBDN_DM2 (Pins 2–3) | Differential pair for USB Port 2 | Hi-Speed-capable D+/D− signals with integrated 27 Ω series termination and 15 kΩ pull-downs |
| USBDN_DP3 / USBDN_DM3 (Pins 4–5) | Differential pair for USB Port 3 | Internally connected to flash media controller; enables compound device enumeration as USB mass storage |
| SD_CMD / MS_D0 / xD_CLE (Pin 24) | Multi-function command line | Drives SD command, MS data 0, or xD command latch enable - selected by active media interface |
| SD_CLK / MS_BS / xD_nWP (Pin 21) | Multi-function clock/control | Provides SD clock, MS bus select, or xD write-protect control - function determined by detected card type |
| nRESET (Pin 38) | Active-low reset input | Asynchronous hardware reset; initiates ROM boot sequence and reinitializes all interfaces and GPIOs |
Key Features
| Feature | Design Value |
|---|---|
| PortMap | Enables dynamic remapping or disabling of downstream ports (1–3) to match host controller port numbering - critical for multi-platform reuse |
| PortSwap | Per-port assignment of D+/D− pin locations (e.g., swap DP2/DM2 to alternate pins) to eliminate PCB trace crossovers and length mismatches |
| PHYBoost | 4-level programmable drive strength on USB downstream transceivers (Ports 2 & 3) to compensate for board-level signal loss and restore eye margin |
| Integrated Power Management | Ganged or individual port power control with configurable over-current delay and power-on ramp timing - reduces BOM count vs discrete switches |
| Firmware Flexibility | Supports configuration via external I²C EEPROM (vendor ID, product ID, strings) or SPI Flash (custom firmware, full feature enablement) |
Applications
| Smartphone Peripheral Expansion | Industrial Embedded Media Hub |
|---|---|
|
Use Scenario: Integrating dual USB peripherals (e.g., camera + keyboard) and SD card logging into a compact smartphone or tablet SoC design. IC Role / Device Role / Timing Role: Acts as HSIC-to-USB bridge and compound media controller - presents as one USB device with three logical interfaces (hub + storage). Use Value: Eliminates need for separate USB hub IC and card reader IC, reducing PCB area and power consumption while maintaining full USB 2.0 compliance. |
Use Scenario: Enabling field-upgradable firmware storage and local data capture in ruggedized GPS navigation units or factory HMIs. IC Role / Device Role / Timing Role: Provides reliable, multi-format flash media access (SD, MS, xD) alongside USB peripheral expansion under −40°C to +85°C conditions. Use Value: Industrial temp rating and robust ESD/EMI performance ensure operation in harsh environments where consumer-grade hubs fail. |
| Mobile PC Docking Station | Consumer A/V Media Adapter |
|
Use Scenario: Adding USB-A ports and SD card slot to ultra-thin laptops via HSIC interface from the CPU chipset. IC Role / Device Role / Timing Role: Serves as high-bandwidth HSIC endpoint with guaranteed >35 MB/s sustained throughput for SDHC/SDXC cards and USB peripherals. Use Value: PHYBoost and PortSwap simplify high-speed layout; integrated regulators reduce external component count in space-constrained docks. |
Use Scenario: Supporting legacy memory card formats (xD, MS Duo, SD) in digital photo frames or portable media players with USB host capability. IC Role / Device Role / Timing Role: Functions as universal flash media translator - automatically detects and configures correct protocol (SD, MS, xD) on insertion. Use Value: Single-chip support for 7+ card variants avoids format obsolescence risk and simplifies inventory management for OEMs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar HSIC USB hub and flash media controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| USB4640-HZH-TR-03 | Tape-and-reel packaging variant; identical electrical and functional specs to USB4640-HZH-03 | Optimized for automated SMT assembly; same footprint, thermal, and timing behavior | Select for volume production; no design or layout changes required vs. USB4640-HZH-03 |
| USB4640i-HZH-03 | Same silicon, identical pinout and firmware; explicitly qualified for industrial temp (−40°C to +85°C) | Guaranteed operation across full industrial range; USB4640-HZH-03 is commercial-grade (0°C to +70°C) | Choose USB4640i-HZH-03 when ambient operating temperature exceeds +70°C or falls below 0°C |
Compared with USB4640-HZH-03, the USB4640-HZH-TR-03 offers identical functionality in tape-and-reel form for SMT lines, while the USB4640i-HZH-03 provides extended temperature qualification - making the latter essential for automotive, industrial, or outdoor deployments where thermal margins are critical.
Availability
USB4640-HZH-03 is available at Aetrix Electronics and suitable for smartphone peripheral expansion, industrial embedded media hubs, and mobile PC docking stations requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for USB4640-HZH-03 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 acquired SMSC in 2012 and now manufactures and supports the USB4640 family as part of its USB connectivity portfolio.
The USB4640 product line was designed specifically for space- and power-constrained mobile and embedded systems needing integrated HSIC-to-USB bridging and multi-format flash media access - eliminating discrete hub + reader solutions.
FAQ
What is the primary function of the USB4640-HZH-03?
The USB4640-HZH-03 is a single-chip HSIC USB 2.0 hub and flash media controller. It bridges an HSIC-enabled host processor to two external USB 2.0 peripherals and provides native read/write support for SD, MMC, Memory Stick, and xD-Picture Card formats via a dedicated internal USB compound device port. Its architecture integrates hub logic, media controller, 8051 processor, and power regulation - all in one 48-pin QFN.
Does the USB4640-HZH-03 support industrial temperature operation?
No - the USB4640-HZH-03 is rated for the commercial temperature range (0°C to +70°C). For industrial operation (−40°C to +85°C), the pin-compatible USB4640i-HZH-03 variant must be used. Both share identical functionality, pinout, and firmware, but only the 'i' suffix denotes industrial qualification with extended thermal validation.
How does the USB4640-HZH-03 handle multiple flash card types?
The USB4640-HZH-03 detects inserted media type (SD, MMC, MS, xD) at power-up or hot-insertion and automatically configures its parallel interface pins (e.g., SD_CMD, MS_BS, xD_CLE) to match the required protocol. It supports SD 2.0/SD-HS/SD-HC, MMC 4.2 (1/4/8-bit), MS 1.43/MS-Pro/MS-Pro-HG/MS-Duo, and xD 1.2 - all with full command/data path handling in firmware.
What configuration options are available for the USB4640-HZH-03?
The USB4640-HZH-03 supports configuration via external I²C EEPROM (for vendor/product IDs and strings) or SPI Flash (for full firmware customization). Key programmable features include PortMap (port remapping/disable), PortSwap (D+/D− pin assignment), PHYBoost (4-level USB drive strength), and GPIO function/polarity - all set at boot time without host software intervention.
Is an external crystal required for USB4640-HZH-03 operation?
A 24 MHz crystal is recommended and supported via XTAL1/XTAL2 pins, but the USB4640-HZH-03 also accepts an external 24 MHz CMOS clock input (1.8 V level) on XTAL1, eliminating the crystal and load capacitors. The internal PLL generates all required clocks, and CRFILT/PLLFILT pins connect to external filter capacitors for stability.
USB4640-HZH-03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Cell Phones, GPS, PCs, Printers, Set-Top Boxes
- Interface:
- -
- Voltage - Supply:
- 1.8V
- Supplier Device Package:
- 48-QFN (7x7)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
USB4640-HZH-03 FAQ
1.How can I place an order for USB4640-HZH-03 through Aetrix?
Please submit a Request for Quotation (RFQ) for USB4640-HZH-03 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 USB4640-HZH-03 reliable?
The price and inventory of USB4640-HZH-03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for USB4640-HZH-03 is usually 5 days.
3.What payment methods are accepted for USB4640-HZH-03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for USB4640-HZH-03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for USB4640-HZH-03?
USB4640-HZH-03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your USB4640-HZH-03 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 USB4640-HZH-03?
For technical support, including USB4640-HZH-03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your USB4640-HZH-03 requirements.
6.How does Aetrix verify that USB4640-HZH-03 is sourced from the original manufacturer or authorized distributors?
All USB4640-HZH-03 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 USB4640-HZH-03 meets industry standards.
7.What is the process for return or replacement of USB4640-HZH-03?
All USB4640-HZH-03 units undergo pre-shipment inspection (PSI). If there is an issue with USB4640-HZH-03, 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 USB4640-HZH-03 part is unused and in its original packaging.
Return procedure for USB4640-HZH-03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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