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Converts 3.3V digital outputs to 5V digital outputs. Easily control 5V relays, or interface with a 5V logic device.

  • Output only
  • Source or sink 50mA or more
  • Up to 800kHz
  • Interfacing with 5V logic circuitry

NOTE: When the LabJack digital I/O is configured as an input, the DigitalOut5V accessory will output logic low.


Common Applications

  • Controlling relays that require 5V logic signals.

Screw Terminal Descriptions

VS: This is the same 5 volt output as the VS terminals on the LabJack itself. This is an output terminal, not an input. It can be used to provide 5 volt (nominal) power as needed.

GND: Same as LabJack ground (GND).

DOA/DOB: These lines are the converted 5V logic lines.

The AND gate has Schmitt trigger inputs (i.e. hysteresis), which help avoid rapid toggling if a noisy signal slowly changes state.

The AND gate is powered by 3.3 volts from a regulator. An input of 0 to 1.0 volts will cause the output of the AND gate to be 0 volts. An input of 2.3 to VS (nominally 5.0) volts will cause the output of the AND gate to be 3.3 volts.

The output amp is powered by VS & GND, and is set up with a gain of x1.5. Thus the 3.3 volt high output of the AND gate will result in a 5.0 volt output from the amp, assuming a light load and assuming that VS is at least 5.0 volts.

If the DIO connected to the tick's input is set to output-high, the tick's output will be high. It the DIO is set to output-low, the tick's output will be low. If the DIO is set to input, the tick's output will be low (due to the pull-down resistors on the inputs). This last fact can be useful when the DIO is configured to go to output-low at power up, as there is usually a brief time where the line will be input before the configuration takes effect.

  Parameter   Conditions   Min   Typical   Max    Units
  Supply Voltage     3.5     5.25   Volts
  Supply Current   No loads     1.5     mA
  Operating Temperature     - 40     80   °C
  Input Range   Normal   0     VS   Volts
    Max   -0.5     VS+0.5   Volts
  Input to cause Logic high      2.3       Volts
  Input to cause Logic low         1.0   Volts
  Logic High Output   VS = 5.0V     5.0     Volts
  Logic Low Output        0     Volts
  Logic High with Load   VS = 5.0, 50 mA load     4.6     Volts
  Output Drive Current (1)   Sink or Source     50     mA
  Rise Time Delay        70     ns
  Fall Time Delay       90     ns
  Rise Time       380     ns
  Fall Time       460     ns
  Max Frequency (2) (3)       760     kHz