SLLS413L February   2000  – June 2017 TUSB2046B , TUSB2046I


  1. Features
  2. Applications
  3. Description
    1.     Device Images
      1.      USB-Tiered Configuration Example
  4. Revision History
  5. Description (Continued)
  6. Pin Configuration and Functions
    1.     Pin Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Differential Driver Switching Characteristics (Full Speed Mode)
    7. 7.7 Differential Driver Switching Characteristics (Low Speed Mode)
    8. 7.8 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 USB Power Management
      2. 8.3.2 Clock Generation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Vendor ID and Product ID With External Serial EEPROM
    5. 8.5 Programming
      1. Table 1. EEPROM Memory Map
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
    1. 10.1 TUSB2046x Power Supply
    2. 10.2 Downstream Port Power
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Placement
      2. 11.1.2 Differential Pairs
      3. 11.1.3 Ground
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Pin Configuration and Functions

VF Package
32-Pin LQFP
Top View
TUSB2046B TUSB2046I po_01_lls413.gif
RHB Package
32-Pin VQFN With Thermal Pad
Top View
TUSB2046B TUSB2046I po_02_lls413.gif

Pin Functions

BUSPWR 8 I Power source indicator. BUSPWR is an active-high input that indicates whether the downstream ports source their power from the USB cable or a local power supply. For the bus-power mode, this terminal must be pulled to 3.3 V, and for the self-powered mode, this terminal must be pulled low. Input must not change dynamically during operation.
DM0 2 I/O Root port USB differential data minus. DM0 paired with DP0 constitutes the upstream USB port.
DM1 11 I/O USB differential data minus. DM1–DM4 paired with DP1–DP4 support up to four downstream USB ports.
DM2 15
DM3 19
DM4 23
DP0 1 I/O Root port USB differential data plus. DP0 paired with DM0 constitutes the upstream USB port.
DP1 12 I/O USB differential data plus. DP1–DP4 paired with DM1–DM4 support up to four downstream USB ports.
DP2 16
DP3 20
DP4 24
EECLK 5 O EEPROM serial clock. When EXTMEM is high, the EEPROM interface is disabled. The EECLK terminal is disabled and must be left floating (unconnected). When EXTMEM is low, EECLK acts as a 3-state serial clock output to the EEPROM with a 100-μA internal pulldown.
EEDATA/GANGED 6 I/O EEPROM serial data/power-management mode indicator. When EXTMEM is high, EEDATA/GANGED selects between ganged or per-port power overcurrent detection for the downstream ports. When EXTMEM is low, EEDATA/GANGED acts as a serial data I/O for the EEPROM and is internally pulled down with a 100-μA pulldown. This standard TTL input must not change dynamically during operation.
EXTMEM 26 I When EXTMEM is high, the serial EEPROM interface of the device is disabled. When EXTMEM is low, terminals 5 and 6 are configured as the clock and data terminals of the serial EEPROM interface, respectively.
GND 7, 28 GND terminals must be tied to ground for proper operation.
OVRCUR1 10 I Overcurrent input. OVRCUR1OVRCUR4 are active low. For per-port overcurrent detection, one overcurrent input is available for each of the four downstream ports. In the ganged mode, any OVRCUR input may be used and all OVRCUR terminals must be tied together. OVRCUR terminals are active low inputs with noise filtering logic.
PWRON1 9 O Power-on/-off control signals. PWRON1PWRON4 are active low, push-pull outputs. Push-pull outputs eliminate the pullup resistors which open-drain outputs require. However, the external power switches that connect to these terminals must be able to operate with 3.3-V inputs because these outputs cannot drive 5-V signals.
RESET 4 I RESET is an active low TTL input with hysteresis and must be asserted at power up. When RESET is asserted, all logic is initialized. Generally, a reset with a pulse width between 100 μs and 1 ms is recommended after 3.3-V VCC reaches its 90%. Clock signal has to be active during the last 60 μs of the reset window.
SUSPND 32 O Suspend status. SUSPND is an active high output available for external logic power-down operations. During the suspend mode, SUSPND is high. SUSPND is low for normal operation.
TSTMODE 31 I Test/mode terminal. TSTMODE is used as a test terminal during production testing. This terminal must be tied to ground or 3.3-V VCC for normal 6-MHz or 48-MHz operation, respectively.
TSTPLL/ 48MCLK 27 I/O Test/48-MHz clock input. TSTPLL/48MCLK is used as a test terminal during production testing. This terminal must be tied to ground for normal 6-MHz operation. If 48-MHz input clock is desired, a 48-MHz clock source (no crystal) can be connected to this input terminal.
VCC 3, 25 3.3-V supply voltage
XTAL1 30 I Crystal 1. XTAL1 is a 6-MHz crystal input with 50% duty cycle. An internal PLL generates the 48-MHz and 12-MHz clocks used internally by the ASIC logic.
XTAL2 29 O Crystal 2. XTAL2 is a 6-MHz crystal output. This terminal must be left open when using an oscillator.