MCC USB-1608G Series High-Speed Multifunction USB DAQ (USB-1608GX) - User Guide

USB-1608GX User's Guide Specifications
18
Digital input/output
Table 6. Digital I/O specifications
Parameter Specification
Digital type
CMOS
Number of I/O
8
Configuration
Each bit may be configured as input (power on default) or output
Pull-up configuration
The port has 47 kΩ resistors configurable as pull-ups or pull-downs (default) via
internal jumper (W1).
Digital I/O transfer rate
(system-paced)
33 to 8000 port reads/writes or single bit reads/writes per second typ,
system dependent.
Input high voltage 2.0 V min
5.5 V absolute max
Input low voltage 0.8 V max
–0.5 V absolute min
0 V recommended min
Output high voltage
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –2.5 mA)
Output low voltage 0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 2.5 mA)
Output current
±2.5 mA max
External trigger
Table 7. External trigger specifications
Parameter Specification
Trigger source
TRIG input
Trigger mode
Software programmable for edge or level sensitive, rising or falling edge, high or low
level. Power on default is edge sensitive, rising edge.
Trigger latency
1 µs + 1 clock cycle max
Trigger pulse width
100 ns min
Input type
Schmitt trigger, 33 Ω series resistor and 49.9 kΩ pull-down to ground
Schmitt trigger hysteresis
0.4 V to 1.2 V
Input high voltage
2.2 V min
5.5 V absolute max
Input low voltage
1.5 V max
–0.5 V absolute min
0 V recommended min