74HC540 PDF

74hc Semiconductors are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 74hc Semiconductors. 74HC Datasheet, 74HC Octal Inverter Buffer Datasheet, buy 74HC Texas Instruments 74HC Logic – Buffers, Drivers, Receivers, Transceivers parts available at DigiKey.

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microcontroller – 74HC vs – Electrical Engineering Stack Exchange

Do they matter for your purpose? 74nc540 see that I can control a relay from an Arduino. I am using a set of 8 relays. Iam relatively new to electronics, and I am building a prototype from an Arduino board. Means to actively drive the pin for the inactive state 47hc540 of using a separate inverter? But in this question they are suggesting to use a 74HC Then you need a ULN 8 Darlington relay driver.

It is like the circuit I drew up but has 8 of them in one package. Home Questions Tags Users Unanswered. Post as a guest Name. No need to install a bulky IC. Wouldn’t it be an option 774hc540 invert the signal already in your software?

This diagram should solve the problem. Sign up using Facebook. The relay can be from 3. A link to the ULN The LED consumes little current so is not an 74uc540. I am using a led to show the status of the pin.

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But the relay is off. Can i use a instead of 74HC? I will check it for sure. As Humpawumpa says, invert the logic in your code. However the problem is – the relay I am using is active low.

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I left you a present. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Does it make any difference? So when I am active high, the led turns on.

So i was thinking of using an inverter. So isnt considering an IC the best solution. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Sign up or log in Sign up using Google. What are the differences between and 74HC that you can read out of the datasheet? Thanks a lot for your help! However a relay usually consumes 74jc540 current and has a back-emf pulse when it is switched OFF.

Thanks for the answer. I dont understand what this means. This solution works when there is a single relay.