Sealed 24-CH 8.5mA 5MHz Digital I/O National Instruments USB-6501 DAQ 779205-01

Specifications
The following specifications are typical at 25 °C, unless otherwise noted.
Digital I/O
Number of lines
P0.<0..7>......................................... 8
P1.<0..7>......................................... 8
P2.<0..7>......................................... 8
Direction control .................................... Input or output,
software-selectable
Output driver type .................................. Push-pull or open-drain,
software selectable
NI USB-6501 OEM User Guide and Specifications 8 ni.com
Pull-up resistor........................................4.7 kΩ VBus (nominally 5 V)
Absolute voltage range ...........................–0.5 to 5.8 V with respect to GND
Power-on state ........................................Input (high impedance)
Digital logic levels
Counter
Number of counters ................................1 (P2.7 can be configured as
a counter)
Resolution...............................................32 bits
Counter measurements ...........................Falling edge counting
Maximum input frequency .....................5 MHz
Minimum high pulse width.....................100 ns
Minimum low pulse width......................100 ns
Bus Interface
USB specification ...................................USB 2.0 full-speed (12 Mb/s)
Level Min Max Units
Input
Input low voltage
Input high voltage
Input leakage current
–0.3
2.0
—
0.8
5.8
50.0
V
V
μA
Output
Output low voltage
Open collector (open-drain) or active drive (push pull)
IOL = 2 mA
IOL = 8.5 mA
Output high voltage
Active drive (push-pull1)
IOH = –2 mA
IOH = –8.5 mA
Open collector (open-drain), IOH = –0.4 mA, nominal
Open collector (open-drain), IOH = –7.5 mA, with
external pull-up resistor
—
—
2.8
2.0
2.0
2.0
0.4
0.8
3.6
3.5
5.0
—
V
V
V
V
V
V
1 The total current sourced by all DO lines simultaneously should not exceed 65 mA.