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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I have to do this without one button influencing the other. How to make a button activate its corresponding binary address Ask Question. Yes, my inputs are already pull-up, the problem is that with this type of configuration I can only recognize one key at a time, if I activate keys 1 and 2 at the same time the input will receive 3.

The logic diagram on the bottom of page 4 shows why: 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. You won’t be able to use your common ground switch arrangement but all other potential datashet will be datsaheet. With all 74lz673 these you would need to handle debounce in code.


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There’s no single pin that performs a “latch” function.

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

Load from the switches into the shift register all 16 switches attached to 16 pullups, then step feed the word back to the micro. Though having 16 buttons using that method would be pushing that technique a tad.

There’s no asynchronous load function, like the load function on the 74LS Serial in parallel out 74LS If you use more than one of these ICs together with their outputs 7ls673 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.

Sign up or log in Sign up using Google. Pressing SW2 pulls down IN1 only. This two-key roll-over is provided between any two switches. That looks like Trevor’s “Visio-Lab”. You need to modify your question to clarify that you want to prevent two button pressed simultaneously giving an erroneous code. 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.


Home Questions Tags 74ls6673 Unanswered. This is an area where a microcontroller excels – scanning a keyboard matrix in your case 4×4. There are other ways that use many diodes. I’ve just acquired two 74LSs and need help understanding the datasheet.

Pressing SW1 pulls down IN0 only.

I’m assuming the inputs are already pulled high by some means. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I have 15 output buttons and 4 digital inputs.

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74LS (Big) bit serial-in serial-out shift register

FYI, The most useful functions: 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. Furthermore, a scanned switch matrix is easy to de-bounce. Eduardo Cardoso 1 The Data Available will return high to indicate acceptance of the new key after a normal debounce period.

Add pullup resistors if necessary.