TUSB2043

4-PORT HUB FOR THE UNIVERSAL SERIAL BUS

WITH OPTIONAL SERIAL EEPROM INTERFACE

SLLS308A – FEBRUARY 1999 – REVISED AUGUST 1999

9

POST OFFICE BOX 655303

APPLICATION INFORMATION

USB design notes

The following sections provide block diagram examples of how to implement the TUSB2043 device. Note, even

though no resistors are shown, pullup, pulldown, and series resistors must still be used to properly implement

this device. Figure 1 shows a few resistors that must be used for the USB lines, and for a general reference

design, one is available on the TI USB web site at http://www.ti.com/sc/usb.

Figure 6 is a block diagram example of how to connect the external EEPROM if a custom product ID and vendor

ID are desired.

Figure 7 is an example of how to generate the 48-MHz clock signal. Figure 7 shows the EEPROM read operation

timing diagram. Figures 8, 9 and 10 illustrate how to connect the TUSB2043 device for different power source

and port power management combinations.

1 k

Ω

DP0

DM0

EEDATA

TUSB2043 USB Hub

System

Power-On Reset

Regulator

Power

Switching

OVRCUR1 –

OVRCUR4

PWRON1 –

PWRON4

EECLK

RESET

TESTIN

EXTMEM

VCC

GND

DP1 – DP4

DM1 – DM4

GND

Vbus

5 V GND

USB Data lines

and Power to

Downstream

Ports

Bus or Local Power

4

4

4

4

30

4

1

2

6

5

3, 25

7, 28

12, 16, 20, 24

10, 14, 18, 22

11, 15, 19, 23

9, 13, 17, 21

5

8

6

2

4

3

ORG

VCC

VSS

D

Q

C

S

1

EEPROM

3.3 V

26

48 MHz Oscillator

CLKIN

27

MODESLCT

31

1 k

Ω

0.1

µF

3.3 V

Figure 6. Typical Application of the TUSB2043 USB Hub