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.
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
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.
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.
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.