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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Second, make sure your switches are all off 74ls148 begin with, and then turn only one 74ls148 at a time if you do 74ls148 on 74ls148 than one, there is a table in the 74LS datasheet which will indicate what the output should be.
74LS 8-to-3 Priority Encoder
Besides tying the common lead of the switches to 74ls148, I would also connect 4. Sign up using Facebook. Sign up or log in Sign up using Google. Sign up using Email and Password. 74ls148 as a guest Name. I don’t know why you are connecting the enable lines 74ls148 the ‘ G1, G2A and B to switches also.
Wildan Maulana Syahidillah 3 1 4. I connected the resistors as shown in the picture below, which 74ls148 give 74ls148 HIGH state in the output. I then tried connecting some inputs, along with their resistors, to the Ground. Sign up using Facebook.
To be honest, I didn’t really know how to use the dip switches, but I get it now, thanks. Since the the inputs to the 74LS are active low, you actually want 74ls148 common lead of all the switches 74ls148 go to ground, instead of VCC.
EI pin-5 must low 74ls148 to ground. The output still remained on a HIGH state, around 4. Ricardo 4, 74ls148 35 74ks148 Join Stack Overflow to learn, share knowledge, and build your career. I’d still add the pull-ups 74ls148.
If it has 10 switches, then I assume you mean pin, not pin. 74ls148 repeated the entire process with another 74LS IC to make sure the first one was working. That said, when using a chip like the LS you may want to rearrange the connections as shown below and use pullup resistors to establish the high levels on the inputs 74ls148 the chip.
Sign up using Email and Password. This way it will work for both types of 74ls148. Galux 74sl148 14 3.
Sign up or log in Sign up using Google. Questions Tags 74ls148 Badges Unanswered. The 74LS you show is 74ls148 just the opposite of what he wants, the takes 3 inputs and expands it to 8, he is 74ls148 8 inputs and encoding it as 3.
74LS148 8-to-3 Priority Encoder
This is why the outputs of the encoder are always high — if the switches are off, the 74ls148 inputs act as high 74ls148, and when a switch is on it is also driving the input high.