Datasheet

MAX14978
SuperSpeed USB Passive Switch
(Low/Full/Hi/SuperSpeed)
11
Pin Description (continued)
Functional Diagram/Truth Table
MAX14978
HI-SPEED USB
ANALOG SWITCHES
NOD+
COMD+
NCD+
NOD-
COMD-
SEL1
EN
NCD-
NO1+
COM1+
NC1+
NO1-
COM1-
SEL2
NC1-
GND
SUPERSPEED USB
ANALOG SWITCHES
NO0+
COM0+
NC0+
NO0-
COM0-
NC0-
V
CC
V
DD
PIN NAME FUNCTION
33
EN
Active-Low Enable Input for Hi-Speed USB Switches. Drive EN high to put Hi-Speed USB switches in
high impedance. Drive EN low for normal operation.
34 V
CC
Positive-Supply Voltage Input for Hi-Speed USB Switches. Bypass V
CC
to GND with a 0.1FF ceramic
capacitor as close as possible to the device.
35 SEL1 Digital Control Input for Hi-Speed USB Analog Switches
37 NCD+ Hi-Speed USB Analog Switch, Normally Closed D+ Terminal
38 NOD+ Hi-Speed USB Analog Switch, Normally Open D+ Terminal
— EP
Exposed Pad. EP is internally connected to GND. Connect EP to a large ground plane to maximize
thermal performance. EP is not intended as an electrical connection point.
HI-SPEED USB SWITCHES
EN SEL1 NOD_ NCD_ COMD_
0 0 OFF ON —
0 1 ON OFF —
1 X OFF OFF HIGH-Z
SUPERSPEED USB SWITCHES
SEL2 NO_ NC_
0 OFF ON
1 ON OFF