Measurement-computing USB-201-OEM Manual do Utilizador descarregar pdf (Página 15)

USB-201-OEM User's Guide Specifications

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

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