National Instruments NI USB-6009 - Manual (Page 28)

NI USB-6008/6009 User Guide and Specifications 28 ni.com
Compatibility ..........................................TTL, LVTTL, CMOS
Absolute maximum voltage range ..........–0.5 to 5.8 V with respect to GND
Pull-up resistor........................................4.7 k Ω 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 k
Ω 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