© National Instruments Corporation 23 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
External Voltage+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
CounterNumber 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
Minimum low pulse width..................... 100 ns
Level Min Max Units
Input low voltage
Input high voltage
Input leakage current
–0.3
2.0
—
0.8
5.8
50
V
V
μA
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
—
2.0
2.0
2.0
0.8
3.5
5.0
—
V
V
V
V