TL714: Comparator input voltage limit

Hello Nikhil,

The input and output voltage ranges are referenced to the supply pins.

The valid input range (for either input) is 1.4V above GND pin to 1.4V below Vcc. So for a +5V supply, the valid input range would be +1.4V to +3.6V.

Since GND stays at the same on a single supply system, the minimum input voltage would be 1.4V. The upper limit would change with V+.

The output voltage will typically swing from +0.4V to 1.6V below Vcc. So if you need a 3.4V max output, you would need a minimum supply of 3.4V + 1.6V = 5V (or 6.1V if you use the maximum numbers - but that is higher than the 5.25V max).

Hi, Paul

Thanks for the reply.
Is it possible to reduce the lower limit of the input voltage below 1.4 V ( say 0.1V) ? Are there any other comaparators which can provide me high even at 0.1 V input voltage with respect to inverting pin of the comparator.

Thanks

Nikhil

Hello Nikhil,

Yes. There are many that can do that.

What are your requirements? Speed? Supply Voltage? Input signal range?

The TL714 is an older device that was optimized for high speed, not "convenience". Many newer devices can sense from below GND to beyond V+.

Hi Paul ,

I need a very low propagation delay not more than 10 ns.  Supply voltage (5V and GND). The differential input signal range must be between 0.1V- 5V. Thanks for the help.

Hello Nikhil,

Have a look at the TLV3501 - I think that will be a good fit.