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Chapter 3 Signal Connections
©
National Instruments Corporation 3-5 PC-DIO-24/PnP User Manual
Digital output specifications (referenced to GND):
Output logic high voltage 3.7 V min 5.0 V max
(I
ol
= –2.5 mA)
Output logic high voltage 2.7 V min 5.0 V max
(I
oh
= –4 mA)
Output logic low voltage 0 V min 0.4 V
(I
ol
= 2.5 mA)
Output logic low voltage 0 V min 0.5 V
(I
ol
= 4 mA)
Figure 3-2 depicts signal connections for three typical digital I/O
applications.