Measurement-computing USB-1208FS-Plus-OEM Bedienungsanleitung PDF herunterladen (Seite 22)

USB-1208FS-Plus-OEM User's Guide Specifications

External trigger

Table 12. Digital trigger specifications

Parameter Specification

Trigger source (Note 7) External digital; TRIG_IN terminal

Trigger mode Edge sensitive; software-selectable for CMOS compatible rising or falling edge, high

or low level

Trigger latency 10 µs max

Trigger pulse width 1 µs 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 high voltage limit 5.5 V absolute max

Input low voltage threshold 1.42 V typ

1.0 V min

2.0 V max

Input low voltage limit –0.5 V absolute min

0 V recommended min

External clock input/output

Table 13. External clock I/O specifications

Parameter Condition Specification

Terminal name SYNC

Terminal type Bidirectional

Direction

(software-selectable)

Output Outputs the internal A/D pacer clock

Input (default) Receives A/D pacer clock from external source

Input clock rate 50 kHz, max

Clock pulse width Input mode 1 µs min

Output mode 5 µs 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 high voltage limit 5.5 V absolute max

Input low voltage threshold 1.42 V typ

1.0 V min

2.0 V max

Input low voltage limit –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)

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