Measurement-computing USB-205 Manual de usuario descargar pdf (Pagina 17)

USB-205 User's Guide Specifications

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

500 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

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Measurement-computing USB-205 Manual de usuario Pagina 17

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