MAX14978 Datasheet, PDF (11/15 Pages) Maxim Integrated Products – SuperSpeed USB Passive Switch (Low/Full/Hi/SuperSpeed)

SuperSpeed USB Passive Switch
(Low/Full/Hi/SuperSpeed)
Pin Description (continued)
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
VCC
Positive-Supply Voltage Input for Hi-Speed USB Switches. Bypass VCC 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.
COMD+
COMD-
SEL1
EN
COM0+
COM0-
COM1+
COM1-
SEL2
VCC
VDD
MAX14978
HI-SPEED USB
ANALOG SWITCHES
SUPERSPEED USB
ANALOG SWITCHES
NOD+
NCD+
NOD-
NCD-
NO0+
NC0+
NO0-
NC0-
NO1+
NC1+
NO1-
NC1-
Functional Diagram/Truth Table
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_
0
OFF
1
ON
NC_
ON
OFF
GND
11