Ω

30

29

31

27

XTAL1

XTAL2

TSTMODE

TSTPLL/48MCLK

TUSB2046B USB HUB

Open

48-MHz Oscillator

or on Board Clock Source

3.3 V

12

TUSB2046B, TUSB2046I

SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017

www.ti.com

Product Folder Links: TUSB2046B TUSB2046I

Submit Documentation Feedback

Copyright © 2000–2017, Texas Instruments Incorporated

Feature Description (continued)

Figure 7. 48-MHz Input Clock Configuration

8.4 Device Functional Modes

8.4.1 Vendor ID and Product ID With External Serial EEPROM

The EXTMEM pin enables or disables the optional EEPROM interface. When the EXTMEM pin is high, the

product ID (PID) displayed during enumeration is the general-purpose USB hub. For this default, pin 5 is disabled

and pin 6 functions as the GANGED input pin. If custom product ID (PID) and vendor ID (VID) descriptors are

desired, the EXTMEM pin must be low (EXTMEM = 0). For this configuration, pins 5 and 6 function as the

EEPROM interface with pins 5 and 6 functioning as EECLK and EEDATA, respectively. See Table 1 for a

description of the EEPROM memory map. A block diagram example of how to connect the external EEPROM if a

custom PID and VID are desired is shown in Figure 8.

Figure 8. Typical Application of the TUSB2046x USB Hub