74LS86D DATASHEET PDF

When we combine these gates then we come up with multiple gates and XOR is one of them. The output state gets LOW only at the same inputs. The XOR gate can be designed with a transistor or with other gates but that will come up with a circuit large in size, to solve this issue we use 74LS86 IC. The IC is smaller in size and it comes up with internal speed protection.

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By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. I then connected 5V to pin 9 and expected the LED fed from pin 8 to light. No luck. I then pulled pins 9 and 10 high by connecting the 10K ohm resistors to 5V.

When I pulled pin 10 low by connecting it to ground, the LED lit. I substituted ohm resistors for the 10K resistors and reconnected them to ground. Now the circuit works properly when I pull either pin 9 or 10 high. Is ohms an appropriate choice? Are pins 9 and 10 sourcing current when they are not active pulled high? I read that low power schottky ICs can only source 8mA. I am calculating that with 5V and ohms that the current draw could be 15mA.

See below clip of this datasheet:. The first number Vil is the maximum input voltage that is guaranteed to be interpreted as low. It is mV. However we almost always want a lower voltage than that to give some noise immunity. The next number Vol shows the guaranteed output voltage when sinking 4mA, which is mV, yielding mV of noise immunity. It would be good to at least match this, so input voltage between 0V and mV. If you just want to use the X-OR gate as an inverter, it's better to just tie the input to GND, of course, as that saves a part and gives you mV of noise immunity rather than Note that in some cases multiple inputs to a gate will source the same current as a single input.

For example, the 74LS30 has the circuit shown below:. There is only a single resistor for all the inputs, so the input current is the same for one input low or 8 inputs low. So use pullups. Also note the connection of the LED. As you have realized, TTL works much better as a current sink rather than a source, so go with it. If the polarity inversion a low output turns the LED on bothers you, buffer the LED with an inverter such as an LS04, or use another stage of the '86 to do the job. Sign up to join this community.

The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Choosing pulldown resistor for 74LS86 Ask Question. Asked 2 years, 2 months ago. Active 2 years, 2 months ago. Viewed times. Please add a schematic to your question, so it can be easier to understand and answer it.

Active Oldest Votes. Peter Bennett Peter Bennett The final number Iil is the maximum input current when the input is at mV, uA. For example, the 74LS30 has the circuit shown below: There is only a single resistor for all the inputs, so the input current is the same for one input low or 8 inputs low. Spehro Pefhany Spehro Pefhany k 9 9 gold badges silver badges bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.

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By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. I then connected 5V to pin 9 and expected the LED fed from pin 8 to light. No luck. I then pulled pins 9 and 10 high by connecting the 10K ohm resistors to 5V.

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