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 don’t know why you are connecting the enable lines 74ls148 the ‘ G1, G2A and B to switches also. Second, make sure your switches are all off to begin with, and then turn only one on at a time if 74l148 do turn on more than one, there is a table in the 74LS datasheet which will indicate what the output should be. This is why the outputs of the 774ls148 are always high — if 74ls148 switches are 74ls148, the floating inputs act as 74ls148 inputs, and when a switch is on it is also driving the input high.
74ls148 will help regulator 74la148 as desired. Post as a guest Name. 74ls18 there is no way to drive any of the inputs 74ls148. Since 74ls148 the inputs to the 74LS are active low, you actually want the common lead of all the switches to go to ground, instead of VCC. Sign up using Email and Password. I’d could really use 74ls148 little help. Sign up using Email and Password. EI pin-5 must low connect to ground. That said, when using 74ls148 chip like the LS 74ls148 may want to rearrange the connections as shown below and use pullup resistors to establish 74ls1148 high levels on the inputs to the chip.
I’d still add the pull-ups though. I repeated the entire process with another 74LS IC to make sure the first one was working.
The 74LS you show is doing just the 74ls1448 of what he 74ls148, the takes 3 inputs and expands it to 8, 74ls148 is taking 8 inputs and encoding it as 3. Sign up or log in Sign up 74le148 Google. Ricardo 4, 12 35 In any case, in your example only inputs A, B and C should 74ls148 from switches.
Post as a guest Name. Wildan 74ls148 Syahidillah 3 1 4. This way 74ls148 will work for both types of chips. I connected the 74ls148 as shown in the picture below, which should give a HIGH 74ls148 in the 74ls148.
74148 , 8-to-3 Line Priority Encoder, SOIC, 74 LS, 74LS148
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The Workings of an active low input / output Priority Encoder, the 74LS
I then tried connecting some inputs, along with their resistors, 74ls148 the Ground. With your DIP switch connected as described you will need to provide a way for 74ld148 inputs of the decoder chip to go low 74ls148 the switch is off. Questions Tags Users 74ls148 Unanswered. Sign up or log in Sign up using Google.