External Trigger - Measurement Computing USB-1208HS-4AO User Manual

USB-1208HS-4AO User's Guide
Output coupling
Power up and reset state
Output noise
Settling time (to 0.05%)
Absolute accuracy
Slew rate
Offset error drift
Gain error drift
Digital input/output
Digital type
Number of I/O
Configuration
Pull-up configuration
Digital I/O transfer rate
(system-paced)
Input high voltage
Input low voltage
Output high voltage
Output low voltage
Output current

External trigger

Parameter
Trigger source
Trigger mode
Trigger latency
Trigger pulse width
Input type
Schmitt trigger
hysteresis
Input high voltage
Input low voltage
20 V output step, (R =5 kΩ, C
L
Table 6. Digital I/O specifications
CMOS
16
Each bit may be configured as input (power on default) or output
The port has 47 kΩ resistors configurable as pull-ups or pull-downs via internal jumper
(default setting is pull-down.)
33 to 8000 port reads/writes or single bit reads/writes per second typical, system
dependent.
2.0 V minimum
5.5 V absolute maximum
0.8 V maximum
–0.5 V absolute minimum
0 V recommended minimum
4.4 V minimum (IOH = -50 µA)
3.76 V minimum (IOH = -24 mA)
0.1 V maximum (IOL = 50 µA)
0.44 V maximum (IOL = 24 mA)
±24 mA maximum per terminal (see "Power"section for additional information)
Table 7. External trigger specifications
Specification
TRIG input
Software configurable for edge or level sensitive, rising or falling edge, high or low level. Power
on default is edge sensitive, rising edge.
1 µs + 1 clock cycle maximum
100 ns minimum
Schmitt Trigger, 33 Ω series resistor and 47 kΩ pull-down to ground
0.4 V to 1.2 V
2.2 V minimum
5.5 V absolute maximum
1.5 V maximum
–0.5 V absolute minimum
0 V recommended minimum
=200 pf)
L
21
Specifications
DC
0 V
0.53 mV rms
5 µS maximum.
±0.1%
6.7 V/µs typical
10 ppm/°C typical
65 ppm/°C typical