Fo rc e -S e n s e S w it c h e s
V+
V-
VL
MAX4556
NC1
NO1
NC2
COM1
COM2
GUARD AMPLIFIER
NO2
LOAD1
NC3
LOAD2
COM3
NO3
IN1
IN2
GND
VOLTAGE OR
CURRENT SOURCE
IN
IN3
LOGIC
IN
0
1
LOAD
1
2
V+
V-
VL
MAX4554
NOG1
NOG2
GCOM
FCOM
GUARD AMPLIFIER
NOF1
NOF2
/MAX456
SCOM
IN1
LOAD2
LOAD1
NOS1
NOS2
GND
EN
VOLTAGE OR
CURRENT SOURCE
LOGIC
IN2
IN
IN
0
1
LOAD
1
2
CMOS INVERTER
Figure 7. Using the MAX4554/MAX4556 to Switch 3-Wire Guarded Circuits from One Source to Two Loads
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