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USB-6501 OEM User Guide 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)
External Voltage
+5 V output
Voltage ............................................4.10 V min, 5.25 V max
Current.............................................230 mA max
Level Min Max Units
Input
Input low voltage
Input high voltage
Input leakage current
–0.3
2.0
—
0.8
5.8
50
V
V
µA
Output
Output low voltage (I = 8.5 mA)
Output high voltage
Push-pull, I = –8.5 mA
Open-drain, I = –0.6 mA, nominal
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