My Inquiry
My Account
Microchip Technology USB4640-HZH-03-TR
- Part No.:
- USB4640-HZH-03-TR
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
USB4640-HZH-03-TR.pdf
- Description:
- IC INTERFACE SPECIALIZED 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,135
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
USB4640-HZH-03-TR from Microchip Technology (formerly SMSC) is a USB 2.0 Hi-Speed hub IC with integrated multi-format flash media controller, providing three downstream ports: one dedicated to internal SD/MMC/MS/xD card interface and two exposed for external USB peripherals. It features an 8051 microprocessor core, 64 KB ROM, 9 KB RAM, 24 MHz crystal driver, and supports sustained transfer rates exceeding 35 MB/s in host-and-media-dependent configurations.
For engineers reviewing the USB4640-HZH-03-TR datasheet, USB4640-HZH-03-TR pinout, USB4640-HZH-03-TR application, or USB4640-HZH-03-TR equivalent, this device is selected for embedded USB expansion with built-in flash reader functionality in space-constrained consumer and industrial platforms requiring single-chip port multiplication and mass storage class peripheral support.
Technical Context
The USB4640-HZH-03-TR implements a transaction translator (TT) enabling concurrent Full-Speed and Low-Speed peripheral operation across all enabled downstream ports. Its hardware-controlled data flow architecture handles multiplexed SD, MMC, Memory Stick, and xD-Picture Card interfaces via shared signal pins optimized for combo sockets.
Configuration is performed via external I²C EEPROM or SPI Flash, supporting customizable VID/PID, serial number, and vendor strings. PHYBoost provides four programmable USB transceiver drive strength levels, while PortMap and PortSwap enable flexible port remapping and differential-pair pin relocation to simplify PCB layout and improve signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Compliance | USB 2.0 Hi-Speed (480 Mbps) with TT for FS/LS device support |
| Flash Media Support | SD 2.0 / MMC 4.2 / MS 1.43 / MS-Pro 1.02 / MS-Pro-HG 1.01 / MS-Duo 1.10 / xD 1.2 (USB4640 only) |
| Memory Resources | 64 KB on-chip ROM + 9 KB RAM; external I²C/SPI firmware loading |
| Supply & Regulation | Single 3.3 V input; internal 1.8 V core regulator reduces BOM count and power loss |
| Package | 48-pin QFN, 7×7 mm, RoHS-compliant, lead-free |
| Crystal Interface | Onboard 24 MHz crystal driver; optional external 24 MHz clock input with resistor divider |
| GPIO Count | Up to 9 configurable GPIOs including one 200 mA drive output with fold-back short-circuit protection |
Pinout & Package
USB4640-HZH-03-TR is housed in a 48-pin QFN package (7×7 mm), RoHS-compliant and lead-free, with exposed thermal pad connected to VSS. Pin functions are validated per SMSC USB2640 datasheet Revision 2.1 (2009), Figure 3.1 and Table 6.1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| nRESET | Active-low reset input | Asynchronous hardware reset; pulls internal logic to known state on assertion |
| USBDN_DP2 / USBDN_DM2 | Downstream Port 2 differential pair | Direct connection to external USB Type-A receptacle; includes integrated series termination |
| USBDN_DP3 / USBDN_DM3 | Downstream Port 3 differential pair | Second exposed USB port; supports Hi-Speed, Full-Speed, or Low-Speed devices |
| xD_D0–xD_D7 / SD_D0–SD_D7 / MS_D0–MS_D7 | Multiplexed flash media data bus | Shared 8-bit bidirectional data path for xD, SD, and Memory Stick protocols; pin reuse managed by protocol state machine |
| SPI_CE_n / SPI_CLK / SPI_DI / SPI_DO | SPI interface for external firmware | Supports 30/60 MHz operation, single/dual-bit mode, and SPI Mode 0/3 for external code execution |
| GPIO1–GPIO15 | Configurable general-purpose I/O | Programmable as LED drivers, card detect inputs, power control signals, or UART TX/RX |
Key Features
| Feature | Design Value |
|---|---|
| PortMap | Enables dynamic reordering or disabling of downstream ports to match host controller enumeration without firmware changes |
| PortSwap | Allows software-defined assignment of D+/D− pairs to physical pins, eliminating trace crossing and length mismatch on PCB |
| PHYBoost | Four-level programmable USB transceiver drive strength compensates for signal degradation from long traces or cables |
| Hardware-Controlled Data Flow | Dedicated logic manages timing-critical flash media transfers without CPU intervention, reducing latency and CPU load |
| EEPROM Update via USB | Firmware and configuration updates performed in-system over USB without requiring external programmers or debug interfaces |
Applications
| Desktop PC Front Panel Hub | Mobile Printer USB Expansion |
|---|---|
Use Scenario: Front-panel USB ports and SD card reader on mid-tower desktop chassis. IC Role / Device Role / Timing Role: USB4640-HZH-03-TR acts as compound device: upstream-facing hub + integrated SD/MS reader, presenting as two separate USB devices to OS. Use Value: Eliminates need for discrete hub + separate card reader IC, reducing component count and board area while maintaining >35 MB/s SD read throughput. | Use Scenario: Compact all-in-one printer with USB host port, SD slot, and optional MMC/xD support. IC Role / Device Role / Timing Role: USB4640-HZH-03-TR serves as embedded USB host controller extension with native flash media access for firmware updates and photo import. Use Value: Enables direct printing from memory cards without host PC; xD-Picture Card support (licensed) allows compatibility with legacy Olympus/Fuji cameras. |
| GPS Navigation Docking Station | Media Player SD Card Interface |
Use Scenario: Automotive-grade docking station that charges GPS unit and exposes its microSD slot to vehicle infotainment system. IC Role / Device Role / Timing Role: USB4640-HZH-03-TR bridges GPS USB device to head-unit while simultaneously exposing SD card as mass storage class peripheral. Use Value: Single-chip solution delivers simultaneous charging, data passthrough, and removable media access-critical for space- and cost-constrained automotive modules. | Use Scenario: Portable media player with dual-slot card reader (SD + MS Pro) and USB OTG capability. IC Role / Device Role / Timing Role: USB4640-HZH-03-TR operates as USB device in OTG mode, presenting itself as hub + flash reader to connected host while managing concurrent card protocols. Use Value: Supports hot-swap detection (via GPIO14/xD_nCD and GPIO12/MS_INS), enabling real-time card insertion/removal notifications without polling overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB hub + flash media controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| USB2514B-AEZG | 4-port Hi-Speed hub only; no integrated flash controller; requires external SD/MMC interface logic | Used where flash media support is handled separately (e.g., via SoC SDIO); lacks xD/MS protocol acceleration | Select when design already includes dedicated flash controller or only needs pure hub functionality with minimal footprint |
| UPD720114GA | USB 2.0 hub with integrated SATA bridge; no SD/MMC/MS/xD support; supports up to 4 downstream ports | Targets hybrid storage docks combining USB and SATA; incompatible with memory card readers | Choose for SATA+USB combo applications; not suitable as flash media reader replacement |
Compared with USB2514B-AEZG and UPD720114GA, USB4640-HZH-03-TR uniquely integrates flash media protocol engines (SD/MS/xD) with hub logic in one die-reducing bill-of-materials, eliminating interconnect latency, and enabling compact, low-power embedded readers unattainable with discrete hub + controller solutions.
Availability
USB4640-HZH-03-TR is available at Aetrix Electronics and suitable for desktop front panels, mobile printers, GPS docking stations, and portable media players requiring stable component supply and long-term lifecycle support.
Supply support for USB4640-HZH-03-TR 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 Standard Microsystems Corporation (SMSC) in 2012 and maintains full support for legacy SMSC USB products including the USB4640 family.
The USB4640 product line was designed for embedded USB expansion with integrated flash media reader functionality-targeting cost-sensitive, space-constrained consumer and industrial systems needing single-chip port multiplication and mass storage class peripheral support.
FAQ
What flash memory formats does USB4640-HZH-03-TR support?
USB4640-HZH-03-TR supports Secure Digital 2.0 (including HC-SD and HS-SD), MultiMediaCard 4.2 (1/4/8-bit), Memory Stick 1.43, Memory Stick Pro 1.02, Memory Stick Pro-HG 1.01, Memory Stick Duo 1.10, and xD-Picture Card 1.2. Note that xD support requires a valid license from Fuji Photo Film Co., Ltd., Olympus Optical Co., Ltd., and Toshiba Corporation, and is enabled only in the USB4640 variant-not USB4641.
Does USB4640-HZH-03-TR require an external crystal?
No, USB4640-HZH-03-TR includes an onboard 24 MHz crystal driver circuit and can operate with a standard 24 MHz crystal connected to XTAL1/XTAL2 pins. An external 24 MHz clock source is optional and must be level-shifted to 1.8 V using a resistor divider before connection to XTAL1 (CLKIN).
How many USB downstream ports does USB4640-HZH-03-TR provide?
USB4640-HZH-03-TR provides three downstream USB ports: one internally connected to the flash media controller (not externally accessible), and two exposed ports (Port 2 and Port 3) for connecting external USB peripherals such as keyboards, mice, or storage devices.
Can USB4640-HZH-03-TR be configured without external memory?
Yes, USB4640-HZH-03-TR boots from internal ROM with a default configuration after reset. External I²C EEPROM or SPI Flash is optional and used only to customize VID/PID, serial number, LED behavior, port mapping, or enable licensed features like xD-Picture Card support. The "-HZH-03" suffix indicates factory-programmed internal ROM revision level 03.
What is the role of the RBIAS pin on USB4640-HZH-03-TR?
The RBIAS pin on USB4640-HZH-03-TR connects to an external 2.2 kΩ resistor to ground, setting the reference bias current for the internal USB transceivers. This resistor calibrates analog circuitry for accurate USB signal levels and ensures compliance with USB 2.0 electrical specifications across voltage and temperature variations.
USB4640-HZH-03-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-TR FAQ
1.How can I place an order for USB4640-HZH-03-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for USB4640-HZH-03-TR 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-TR reliable?
The price and inventory of USB4640-HZH-03-TR 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-TR is usually 5 days.
3.What payment methods are accepted for USB4640-HZH-03-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for USB4640-HZH-03-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for USB4640-HZH-03-TR?
USB4640-HZH-03-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your USB4640-HZH-03-TR 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-TR?
For technical support, including USB4640-HZH-03-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your USB4640-HZH-03-TR requirements.
6.How does Aetrix verify that USB4640-HZH-03-TR is sourced from the original manufacturer or authorized distributors?
All USB4640-HZH-03-TR 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-TR meets industry standards.
7.What is the process for return or replacement of USB4640-HZH-03-TR?
All USB4640-HZH-03-TR units undergo pre-shipment inspection (PSI). If there is an issue with USB4640-HZH-03-TR, 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-TR part is unused and in its original packaging.
Return procedure for USB4640-HZH-03-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
USB4640-HZH-03-TR Tags
-
NVT4857UKAZ
NXP Semiconductors
-
TCA8418RTWR
Texas Instruments
-
PCA9546APWR
Texas Instruments
-
MD0100N8-G
Microchip Technology
-
PCA9548APW,118
NXP Semiconductors
-
PCA9540BDP,118
NXP Semiconductors
-
PCA9548APWR
Texas Instruments
-
PCA9546APW,118
NXP Semiconductors
-
PTN3360DBS,518
NXP Semiconductors
-
PCA9546ABS,118
NXP Semiconductors
-
PCA9518PWR
Texas Instruments
-
PCA9545APW,118
NXP Semiconductors
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
