Appendix A
Specifications
A-8
©
National Instruments Corporation
Digital I/O and Alarm Outputs
Number of lines
PCMCIA ..................................... 4
ISA and USB ............................... 8
Compatibility ..................................... TTL
DIO<0..3/7>
Power-on state.................................... Tristate (weak pull up)
Data transfers ..................................... Programmed I/O
Bus Interface
Type ................................................... Slave (Plug and Play)
Power Requirement
PCMCIA ............................................ 130 mA at +5 V
ISA..................................................... 160 mA at +5 V
USB ................................................... High power, USB powered
peripheral (500 mA)
Level
Minimum
Maximum
Input low voltage
0.0 V
0.8 V
Input high voltage
2.0 V
5.0 V (V
cc
)
Input low current (V
in
= 5 V)
—
–10
µ
A
Input high current (V
in
= 5 V)
—
10
µ
A)
Output low voltage (I
out
= 8 mA)
—
0.4 V
Output high voltage (I
out
= 8 mA)
3.8 V
—
