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Tool/software:
In the datasheet, it says that IN- is connected to ground for a typical application, can I connect a pulse to IN- instead of IN+? Will that work, do I need a pullup resistor because the datasheet does not give any information about any erratic behaviour.
Yes Yousef,
You can short IN+ to VCCI, and send a square wave to IN-. This will result in a high output when IN- is low, and a low output when IN- is high. We call this inverting configuration.
You could add a pull-up resistor to IN- to make sure the output will be low if the input signal is high-Z.
Best regards,
Sean
Thank you so if I want a high signal on the output, I should not connect the pull up resistor when the input is low.
Hi Yousef,
The low input will dominate as long as it can supply a few uA, so you can leave the pull-up resistor connected. The pull-up resistor only will control the IN- voltage if the input is high-Z (open), not if the input is 0V and low resistance, or 5V and low resistance.
Best regards,
Sean