External Voltage - National Instruments NI USB-6008 User Manual

Input low voltage
Input high voltage
Input leakage current
Output low voltage (I = 8.5 mA)
Output high voltage
Active drive (push-pull), I = –8.5 mA
Open collector (open-drain), I = –0.6 mA, nominal
Open collector (open-drain), I = –8.5 mA, with external
pull-up resistor

External Voltage

Counter
NI USB-6008/6009 User Guide and Specifications
Compatibility ..........................................TTL, LVTTL, CMOS
Absolute maximum voltage range ..........–0.5 to 5.8 V with respect to GND
Pull-up resistor........................................4.7 kΩ to 5 V
Power-on state ........................................Input
Digital logic levels
Level
+5 V output (200 mA maximum) ...........+5 V typical, +4.85 V minimum
+2.5 V output (1 mA maximum) ............+2.5 V typical
+2.5 V accuracy ......................................0.25% max
Reference temperature drift ....................50 ppm/°C max
Number of counters ................................1
Resolution ...............................................32 bits
Counter measurements ...........................Edge counting (falling-edge)
Counter direction ....................................Count up
Pull-up resistor........................................4.7 kΩ to 5 V
Maximum input frequency .....................5 MHz
Minimum high pulse width.....................100 ns
28
Min Max
–0.3 0.8
2.0 5.8
— 50
— 0.8
2.0 3.5
2.0 5.0
2.0 —
Units
V
V
μA
V
V
V
V
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