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© National Instruments Corporation 25 NI 6509 User Guide and Specifications
Power-on state........................................Configured as inputs,
pull-up/pull-down (selectable on
the back panel switch)
Pull-up/pull-down resistor......................100 kΩ ±5%
Data transfers .........................................Programmed I/O
Digital Input Characteristics
Digital Output Characteristics
Level Min Max
Input voltage 0 V 5.0 V
Input low voltage
Input high voltage
Input low current (V
in
= 0 V)
Input high current (V
in
= 5 V)
—
2.0 V
—
—
0.8 V
—
–91.0 μA
91.0 μA
Level Min Typ Max
Low-level output current (I
OL
) — — 24 mA
High-level output current (I
OH
) — — –24 mA
Output low voltage (V
OL
), at 100 μA
at 2 mA
at 12 mA
at 24 mA
—
—
—
—
0.0 V
0.1 V
0.5 V
1.0 V
0.2 V
—
—
1.4 V
Output high voltage (V
OH
), at –100 μA
at –2 mA
at –12 mA
at –24 mA
4.3 V
—
—
2.8 V
5.0 V
4.9 V
4.5 V
4.0 V
—
—
—
—