LMN Datasheet, LMN National Semiconductor Voltage Comparator Datasheet, buy LMN. The LM, LM, LM are voltage comparators that have low input currents. They are also designed to operate over a wide range of. Part, LMN. Category. Description, Voltage Comparators. Company, ST Microelectronics, Inc. Datasheet, Download LMN datasheet. Cross ref.

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The simplified schematics of the IC is shown below: I just built the circuit in real life and it works exactly as I thought, putting GND on the strobe pin makes the output a constant state at Vcci. Message 4 of 5.

Multisim and Ultiboard

I built a simple circuit using the LMN comparator. The simplified schematics of the IC is shown below:.

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Any help is appreciated. A sample circuit is shown below in which the Inverting Terminal is set to 2.

As grounding unused pins is a practice on electronics, I guess it was the way of the designer to make sure the device dataasheet not disabled for a ground wired to that pin. Submitted by admin on 6 March According to the datasheet, if you tie the strobe pin to GND then the output should be disabled. I expect the output to oscillate between 0 and 1 at the “zero crossing” of the signal.


The LM can work on a Single supply voltage or in a dual supply mode. Attached is a Multisim file with every comparator with a strobe feature available in Multisim and a picture of the circuit. TL — Programmable Reference Dafasheet. Message 5 of 5. When not in use the pins 5 and 6 should be shorted as shown above.

Normally these pins are not used since the Input Offset itself is much better controlled. You can refer the other possible circuits from the LM datasheet given at bottom.

The pins 5 and 6 on the Op-amp are used to set the balance voltage if you want to manually adjust the DC-Offset voltage. LMN Comparator with Strobe.

LMN Datasheet(PDF) – National Semiconductor (TI)

I tried adding in a transistor with a 1k resistor to ground and a TTL signal at the base as per the datasheet and this doesn’t disable the output either. Datasehet pin is connected to the ground of the system Negative voltage can also be used. An Emitter Output Circuit is shown below. Message 1 of 5.

The output is correct as seen on the scope. Message 2 of 5.

The transistor can also make the Load to be isolated from the system ground, so if you are looking for a Voltage comparator to drive loads of these specifications then this IC might be the right choice for you. The problem is that tying the strobe pin to ground lk311n make the output stop changing, and it isn’t.


If the voltage at the Non-Inverting Terminal pin 2 is higher than the Inverting Terminal pin 2the output pin 7 will also be high else the output will be low.

You can note that the Output voltage stays high when pin 2 has higher voltage than pin 7 and vice versa. Most Active Software Boards: Why pm311n it not working in Multisim? All of those comparator outputs should be a high state which means the LED will turn on connected through the 1K resistor to Vcc.

The problem is that the strobe pin is not working for the model.

Could the component model be lk311n issue? Any Op-Amp can be made to work as a voltage comparator, but the LM proves itself to be advantages by housing an Output Transistor inside its package. Message 3 of 5.