Data Sheet

© 2005 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSUSB22 • Rev. 1.0.3 2
FSUSB22 — Low-Power, 2-Port, High-Speed USB 2.0 (480Mbps) Switch
Logic Diagram Analog Symbol
USB
Port
USB
Port
D-
D+
D+
D-
Docking Station
USB 2.0
Host
Controller
FSUSB22
USB
Port
USB
Port
D+
D-
D+
D-
D+
D-
D+
D-
Notebook Computer
Docking Connector
1B
1
1B
2
1A
2B
1
2B
2
2A
GND 3A
3B
2
3B
1
4A
4B
2
4B
1
/OE
S
V
CC
1
16
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Figure 1. Logic Diagram
Figure 2. Analog Symbol
S
1B
1
1B
2
1A
2B
1
2B
2
2A
GND
V
CC
/OE
4B
1
4B
2
4A
3B
1
3B
2
3A
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
1B
1
1B
2
1A
2B
1
2B
2
2A
GND 3A
3B
2
3B
1
4A
4B
2
4B
1
/OE
S
V
CC
116
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Figure 3. QSOP and TSSOP Pin Configuration Figure 4. Pad Assignment for DQFN
Pin Descriptions
Pin # Pin Names Description
1 S Select Input
2,3,5,6,10,11,13,14 1B
1
,1B
2
, 2B
1
,2B
2
,3B
2
,3B
1
,4B
2
,4B
1
Bus B
8 GND Ground
4,7,9,12 1A,2A,3A,4A Bus A
15 /OE Bus Switch Enable
16 V
CC
Supply Voltage
Truth Table
S OE Function
Don’t Care HIGH Disconnect
LOW LOW A=B
1
HIGH LOW A=B
2