Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise . 74ls,, 74ls Matched Datasheet Manufacture, PDF . 1, 74ls, BIT SHIFT REGISTERS, Texas Instruments, 74ls pdf. Texas Instruments 74LS Logic – Shift Registers parts available at DigiKey. SN74LSDW Datasheet · SN74LSDW – Texas Instruments ·

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How do I make each button activate its corresponding address. Sign up using Facebook. Sign up using Email and Password.

There are other ways that use many diodes. With all of these you would need to handle debounce in code. You can use a couple of 74LS encoders as shown in their data sheet. Anyone want to make some money 74lss673 online consulting? Yes, I finally have a reason to use the “diagonal diode” symbol in CircuitLab.

clock, data and latch on the 74LS

The logic diagram on the bottom of page 4 shows why: There’s no single pin that performs a datadheet function. Internal debounce with single external capacitor. You need to modify your question to clarify that you want to prevent two button pressed simultaneously giving an erroneous code. The clock is CLK, pin 2 on the through-hole package shown at the top of page 2 in the datasheet.

(PDF) 74LS673 Datasheet download

If the voltage is negative, then reverse the datashete of the diodes. The output pins are pretty obvious, and I can GUESS at the clock, data and latch pins, but would totally appreciate if someone more knowledgeable could tell me which are the clock, data and latch.


Pressing SW2 pulls down IN1 only. It sounds as though you need a proper keyboard matrix controller. The Data Available will return datasheeet to indicate acceptance of the new key after a normal debounce period. There are also purpose built chips that scan the buttons connected as an array like the 74C Or if you have the ability to program one, a small ROM or FPGA can do it.

Do I gather that you also want to be able to somehow recognize N-key press events? You are not answering Jonk’s question. However your statement “have to do this without one button influencing the other” and comments imply you need the ability to detect more than one button pressed at the same time.

Pressing SW1 pulls down IN0 only. The most direct way to do it is to build a diode matrix: If you use more than one of these ICs together with their outputs tied to the same input, you’ll need to manage the CS pins in order to ensure that both ICs don’t try to deliver data at the same time.

Serial in parallel out 74LS Since it’s only 15 switches, another way this can be 74la673 is to use a shift register rather than an array.

I’ll take it from there. Email Required, but never shown. I’ve just acquired two 74LSs and need help understanding the datasheet. That’s what diodes are for. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


But it’s better to show them here for completeness, remember next person searching datashwet web and finding this question may have a 74ls763 micro or idea in his head.

74LS673 (Big) 16-bit serial-in serial-out shift register

You even get to be able to detect SW0 thanks to the Data Available signal! As in the picture: You forgot the pull-ups though. That is an entirely different proposition. The MM74C key encoder. This two-key roll-over is provided between any two switches.

Available output returns to a low level when the entered key is released – even if another is depressed. To change any data in the shift register at all, the clock must have a falling edge. I’m assuming the inputs are already pulled high by some means. Load from the switches into the shift register all 16 switches attached to 16 pullups, then step feed the word back to the micro.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Parallel in serial out 74LS Another alternative is to turn your buttons into a rudimentary digital to analog convertor and feed that analog value into whatever analog to digital convertor you may have available.