Part Number: 74LS, Maunfacturer: National Semiconductor, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor. 74LS SN74LSD. ACTIVE. SOIC. D. Green (RoHS. & no Sb/Br) . Reproduction of significant portions of TI information in TI data sheets is. Multiplexers & Demultiplexers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas Instruments 74LS Encoders, .

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The “Recommended Operating Conditions” table will define the conditions for actual device operation. It would actually be easier and cheaper to directly drive two decoders as in suggestion 1 above. The BCD parts would be perfect if you can find them. Then I’ll create a program from Microprocessor using assembly language.

But I dont think you have it in multisim. I was browsing for an electronics project and came by to this.

74LS157 Quad 2-Input Multiplexer

You can do that without the multiplexing circuit shown. Your name or email address: No, create an account now. The parametric values defined in the “Electrical Characteristics” datazheet are not guaranteed at the absolute maximum ratings.

Ice is measured with 4. Note that the circuit you linked actually needs 9 signals to operate, and is overly complex in my opinion.

A 4-bit word is selected from one 74lss157 two sources and is routed to the four outputs. Mar 24, 9. What we’ve been doing in school is that our professor gives out a schematic and then we replicate the schematic in EAGLE and then create the hardware using pcbs.


Note that there are a couple of electrical errors in the schematic, and it will not function as drawn. Aug 1, 7, 2, It needs 9 signals because there are 9 external signals on the schematic: Ok so I think I’ll go with this idea. Some of them are: Posted by Raptor in forum: I can design a better replacement, but that’s your job. The schematic still lacks something. Search the history of over billion web pages on the Internet.

Posted by 1ronman in forum: This would drive two digits. It is able to display directly from the outputs of ‘ to 0-F in 7 segment format.


It is possible to do this with 5 lines, but you’ll have better control over the display with 6. Mar 23, 6. Full text of ” IC Datasheet: Also, each switch input to the chips needs a 10K pulldown resistor. Mar 23, 4. If not, good day then. Given that the two number values are static at the multiplexer input, the circuit is overly complex.

And how can I make this display 2 digit outputs? So are there other bcd to 7 segment ICs that will properly display the hexadecimal output? Use this tutorial to get your FPGA development environment setup and understand the tool set and basic development process. Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.


To be more precise, my goal for this project is to somehow interface the circuit using a parallel cable and connecting the 8 data pins to the multiplexer ic. Need help with circuit Posted by karaandnick in forum: I 1 0. Dec 29, 1, The device should not be operated at these limits. Not sure if you have it in your sim Need help with circuit! A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

Quote of the day. After 9, the 7 segment doesn’t display A,B,C,etc.

74lx157 Your initial question about how to generate the data select signal indicates that you don’t fully understand how this circuit works, or why it should be used.

You can use two 4-bit adders in series to make an 8-bit adder. Need Help with circuit and components!!

Quad 2-Input Data Selector/Multiplexer

Once you understand how this one “works” and what is wrong with it, that will guide an alternative design. A 4 bit binary adder circuit.

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