© National Instruments Corporation 27 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
Counter
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
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