USB 2.0 Hi-Speed Differential

8:1 Multiplexer

_______________________________________________________________________________________

9

GND

+3.3V

USB7

+

-

D7_1

D7_0

USB6

+

-

D6_1

D6_0

USB5

+

-

D5_1

D5_0

25

26

28

29

31

32

USB0

+

-

D0_1

D0_0

USB1

+

-

D1_1

D1_0

USB2

+

-

D2_1

D2_0

16

15

13

12

10

9

USB3

+

-

USB4

-

+

23 22

19 18

COMMON

-

+

45

3 6 7

8

EN C0 C1 C2

1, 11, 14, 17,

21, 24, 27, 30

MAX4999

2, 20

Figure 4. The MAX4999 Multiplexes Between Eight Differential Channels (8:1)

USB D+, D- MUST BE REVERSED IF DEVICES ARE CONNECTED AS SHOWN,

THIS IS TRUE OF D0_ _ TO D7_ _. C0, C1, C2 ARE CONNECTED IN PARALLEL.

EN0 AND EN1 ARE USED TO SELECT BETWEEN DEVICE 0 AND DEVICE 1.

ONE PAIR SHOWN

+

-

16

15

D20

+

-

15

16

D20

4

5

1

8

5

4

1

+

+

C2 C1 C0 EN0

EN1

6

7

8

USB TYPE A

COMMON

7

6

3

3

MAX4999

DEVICE 0

MAX4999

DEVICE 1

Figure 5. Combining Two MAX4999 Devices for 16:1 USB Connections