35
Relay Output Port
Functional Description
The relay output implements a potential-free and polarity-free solid-state contact. It is capable of
switching both AC- and DC-powered resistive loads.
The contact remains in the OPEN state during the board initialization procedure.
In the CLOSED state, the output port exhibit a voltage drop across its pins. Typical voltage drops
for current values of 1, 10 and 100 mA are shown in the following table:
Operating the relay output with load currents below 1 mA is not recommended since it exhibits a
large equivalent resistance!
Operating Characteristics
Property
Condition
Min.
Typ.
Max.
Unit
Load Current - Recommended range
(1)
1
10
50
mA
Voltage across pins
1 mA; (2)
0.65
V
10 mA; (2)
1.3
V
50 mA; (2)
1.75
V
Condition (1):
Ambient temperature up to 55 °C
Condition (2):
25 °C ambient temperature
Absolute Maximum Ratings
Property
Test Condition
Min.
Typ.
Max.
Unit
Voltage
Contact open
-30
+30
V
AC voltage
Contact open
21
V
RMS
DC current
Contact closed
-100
+100
mA
AC current
Contact closed
70
mA
RMS
Isolation voltage
500
V
RMS
Exceeding the absolute maximum ratings may irreversibly damage the device.
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