National Instruments NI USB-6009 User Manual

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

+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 k

Ω to 5 V

Maximum input frequency .....................5 MHz

Minimum high pulse width.....................100 ns

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