Measurement-computing USB-1608FS-Plus Manuel d'utilisateur télécharger pdf (Page 19)

USB-1608FS-Plus User's Guide Specifications

External trigger

Table 6. External trigger specifications

Parameter

Condition

Specification

Trigger source

External digital

TRIG_IN

Trigger mode

Software-selectable

Edge or level sensitive: user configurable for CMOS

compatible rising or falling edge, high or low level.

Trigger latency

2 µs + 1 pacer clock cycle max

Trigger pulse width

1µs 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

3.1V 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 7. External clock I/O specifications

Parameter

Condition

Specification

Pin name

SYNC

Pin type

Bidirectional

Direction, software-selectable

Input

Receives A/D pacer clock from external source

Output

Outputs internal A/D pacer clock

Input clock rate

100 kHz, max

Clock pulse width

Input

1 µs min

Output

4 µs min

Input clock mode

Edge sensitive, rising

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

3.1V 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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