Measurement Computing USB-201-OEM - Manual (Page 15)

USB-201-OEM User's Guide Specifications
15
External digital trigger
Table 6. External digital trigger specifications
Parameter Specification
Trigger source TRIG input
Trigger mode Software configurable 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 pacer clock cycle max
Trigger pulse width 125 ns min
Input type Schmitt trigger, 47
kΩ pull-down to ground
Schmitt trigger hysteresis 1.01 V typ
0.6 V min
1.5 V max
Input high voltage threshold 2.43 V typ
1.9 V min
3.1 V max
Input low voltage threshold 1.42 V typ
1.0 V min
2.0 V max
Input voltage limits 5.5 V absolute max
–0.5 V absolute min
0 V recommended min
External pacer input/output
Table 7. External pacer I/O specifications
Parameter Specification
Terminal names AICKI, AICKO
Terminal types AICKI: Input, active on rising edge
AICKO: Output, power on default is 0 V, active on rising edge
Terminal descriptions AICKI: Receives pacer clock from external source
AICKO: Outputs internal pacer clock
Input clock rate 100 kHz max
Clock pulse width AICKI: 400 ns min
AICKO: 400 ns min
Input type Schmitt trigger, 47
kΩ pull-down to ground
Schmitt trigger hysteresis 1.01 V typ
0.6 V min
1.5 V max
Input high voltage threshold 2.43 V typ
1.9 V min
3.1 V max
Input low voltage threshold 1.42 V typ
1.0 V min
2.0 V max
Input voltage limits 5.5 V absolute max
–0.5 V absolute min
0 V recommended min
Output high voltage 4.4 V min (IOH = –50 µA)
3.80 V min (IOH = –8 mA)
Output low voltage 0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 8 mA)
Output current ±8 mA max