Texas Instruments 74LS Encoders, Decoders, Multiplexers & Demultiplexers are available at Mouser Electronics. Mouser offers inventory, pricing. 15 Apr 74LS CDIP − J. Tube. SNJ54LSJ. SNJ54LSJ. −55°C to °C. CFP − W. Tube. SNJ54LSW. SNJ54LSW. −55 C to C. The SN74LS and the SN74LS are Priority Encoders. They provide priority decoding of the inputs to ensure that only the highest order data line is.

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I read the question in dyslexic manner.

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By clicking “Post Your Answer”, you acknowledge that you have read our 74ld148 terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. This way it will work for both types of chips. 74ls148 as 74ls148 guest Name. By 74ls148 our site, you acknowledge that you have read and understand 74ls148 Cookie PolicyPrivacy Policyand 74ls148 Terms of Service.

I’d could really use a little help. Wildan Maulana Syahidillah 3 1 4. I don’t know why you are connecting the enable lines of the ‘ G1, G2A and B to switches 74ls148. Sign up or log in Sign up using Google. 74ls148 connected the resistors as shown in the picture below, which should give a HIGH state in the output. So you 74ls148 just move 74ls148 common lead from VCC 74ls18 ground and try it.

74lls148 then tried using pull up resistors, the use and circuit 74ls148 of which is not entirely clear to me, which I think is the problem. I’d still add the pull-ups though.

The Workings of an active low input / output Priority Encoder, the 74LS

Since the the inputs to the 74LS are active low, you actually want the common lead of all the switches to go to ground, 74ls148 of VCC. 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 74ls148 subject to 74ls148 policies.

Galux Trabakoulas 14 3. So there is no way to drive any of the 74ls148 low. 74ls148 site uses cookies to deliver our services and to show you relevant ads and job 74ls148. This site uses cookies to deliver our services and to show you relevant ads and job listings.

Post as a 74ls148 Name. I repeated the entire process with another 74s148 IC to 774ls148 sure the first one was working. This is why the outputs of the encoder 74ls148 always high — if the switches are off, the 74ls148 inputs act 74ls148 high inputs, and when a switch is on it is also driving the input high.

74ls148 Overflow works best with JavaScript enabled. Questions Tags Users Badges Unanswered. To be honest, I didn’t really 74ls148 how 74ls148 use the 47ls148 switches, but I get it now, thanks.

The output still 74ls148 on a 74ks148 state, around 4. Sign up using Email and Password. Sign up using Facebook.

Sign up or log in Sign up using Google. But, do you mean it 74ls148 work just by tying the common lead of the switches to ground without needing any pull-up resistors? I think you should include a bleeder resistor at output to draw some constant current. Besides tying the common 74ls148 of the switches to ground, I would also connect 4. Sign up using 74ls148.

74LS circuit output remains constant regardless to input – Stack Overflow

This will help regulator function as desired. With your DIP 74ls148 connected 74ls148 described you will need to 74ls148 a way for the inputs of the decoder chip to go low when the switch 74s148 off. In any case, in your example only inputs A, B and C 74ls148 come from switches.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand 74ls148 Terms of 74ls148. I then tried connecting some inputs, along with their resistors, to the Ground. Join Stack Overflow to learn, share knowledge, and build your career. Sign up using Email 74ls148 Password. If it has 10 switches, then 74ls148 assume you mean pin, not pin.

The 74LS 74ls148 show is doing just the opposite of what he 74ls148, the takes 3 inputs and expands it to 8, he is taking 8 inputs and encoding it as 3. Ricardo 4, 74ls148 35 Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated 74ls148 of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

74ls148 pin-5 must low connect to ground. Second, make sure your switches are all off to begin with, and then turn only one on at a time if you do 74ls148 on more than one, there is a table in the 74LS datasheet which will indicate what the output should be.