Chapter 2
Configuration and Installation
© National Instruments Corporation
2-35
AT-MIO-16D User Manual
I
IH
input current load,
logic high input voltage
40
µ
A maximum
I
IL
input current load,
logic low input voltage
-120
µ
A maximum
Digital output specifications (referenced to DIG GND):
V
OH
output logic high voltage
2.4 V minimum
V
OL
output logic low voltage
0.5 V maximum
I
OH
output source current, logic high
2.6 mA maximum
I
OH
output sink current, logic low
24 mA maximum
With these specifications, each digital output line can drive 11 standard TTL loads and over 50 LS
TTL loads. The MIO-16 circuitry digital I/O lines are pulled up through 100-k
Ω
resistors to +5 V.
Figure 2-32 depicts signal connections for three typical digital I/O applications.
LED
+5 V
TTL Signal
+5 V
Port A
ADIO<3..0>
Port B
BDIO<3..0>
31
29
27
25
32
30
28
26
24
DIG GND
Switch
MIO-16 I/O Connector
AT-MIO-16D Board
Figure 2-32. Digital I/O Connections
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