
MAX4901–MAX4905
Low-RON, Dual-SPST/Single-SPDT Clickless
Switches with Negative Rail Capability
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7
Pin Description (MAX4901/MAX4902 Dual-SPST Switches)
PIN
TDFN
UCSP
NAME
FUNCTION
1B1
VCC
Positive Supply-Voltage Input. Bypass VCC to GND with a 0.1F capacitor as close
to VCC as possible.
2A1
COM1
Analog Switch 1, Common Terminal
—B2N.C.
No Connection. Leave N.C. unconnected.
3A2
NO1
Analog Switch 1, Normally Open Terminal. NO1 (MAX4902) has a shunt resistor to
GND when the switch is in open position.
4A3
IN1
Digital Control Input for Analog Switch 1. A logic high on IN1 connects COM1 to
NO1 and a logic low opens the switch.
5B3
GND
Ground
6C3
IN2
Digital Control Input for Analog Switch 2. A logic high on IN2 connects COM2 to
NO2 and a logic low opens the switch.
7C2
NO2
Analog Switch 2, Normally Open Terminal. NO2 has a shunt resistor to GND when
the switch is in open position (MAX4902).
8C1
COM2
Analog Switch 2, Common Terminal
EP
—
EP
Exposed Pad. Connect exposed pad to GND.
Pin Description (MAX4903/MAX4904/MAX4905 SPDT Switches)
PIN
TDFN
UCSP
NAME
FUNCTION
1A1
VCC
Positive Supply-Voltage Input. Bypass VCC to GND with a 0.1F capacitor as close
to VCC as possible.
2A2
NO
Analog Switch, Normally Open Terminal. NO has a shunt resistor to GND when the
switch is in open position (MAX4904/MAX4905).
3A3
IN
Digital Control Input. Logic low on IN connects COM to NC and logic high connects
COM to NO.
N.C.
No Connection. Leave N.C. unconnected (MAX4903/MAX4904).
4B2
CMPO
Comparator Output (MAX4905)
5B3
GND
Ground
N.C.
No Connection. Leave N.C. unconnected (MAX4903/MAX4904).
6C3
CMP-
Comparator Input (MAX4905)
7C2
NC
Analog Switch, Normally Closed Terminal. NC has a shunt resistor to GND when the
switch is in open position (MAX4904/MAX4905).
8B1
COM
Analog Switch, Common Terminal
—C1N.C.
No Connection. Leave N.C. unconnected (MAX4903/MAX4904/MAX4905)
EP
—
EP
Exposed Pad. Connect exposed pad to GND.