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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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If you want to display a 2-digit number using data lines out of a microcontroller, there are several ways to do this.

I can design a better replacement, but that’s your job. Does it have to be 8 data lines? Datashwet 24, 8. Mar 23, 11 0. You can use two 4-bit adders in series to make an 8-bit adder.

Need help with circuit — 74ls decoder and 74ls multiplexer. | All About Circuits

Do you already have an account? Mar 25, Oct 27, 6, 1, You May Also Like: The schematic still lacks something. Absolute Maximum Ratings Note Note: Posted by 1ronman in forum: 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.


A 4-bit word is selected from one of two sources and is routed to the four outputs. Need help with circuit! Datasjeet, create an account now. I 1 0. Need Help with circuit and components!!

You can move part of the multiplexing task to your software and use only eatasheet signals from the uC. A separate strobe input is provided. 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.

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. The “Absolute Maximum Ratings” are tfiose datwsheet beyond which the 74l1s57 of the device cannot be guaran- teed.

Note that the circuit you linked actually needs 9 signals to operate, and is overly complex in my opinion. So are there other bcd to 7 segment ICs that will properly display the hexadecimal output?

Then I’ll create a program from Microprocessor using assembly language. The “Recommended Operating Conditions” table will define the conditions for actual device operation.


It needs 9 signals because there are 9 external signals on the schematic: But I dont think you have it in multisim. Once you understand how this one “works” and what is wrong with it, that will guide an alternative design. Ok thanks for the help! After 9, the 7 segment doesn’t display A,B,C,etc. Ok so I think I’ll go with this idea. Only one digit output.

74LS157 – Quad 2-In Multiplexer Noninv

A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the 74ld157 of the life support device or system, or to affect its safety or effectiveness. Ice is measured with 4. If not, good day then.

Two displays, two decoders each with 7 resistors8 data lines four to eachand you’re done. It is possible to do this with 5 lines, but you’ll have better control over the display with 6.

The Motorola MC datasheet has the connection details.