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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Feed one output low through the shift register and read back the status on the common line.

You are not answering Daasheet question. I have 15 output buttons and 4 digital inputs. In that case you would need some form of keypad scanner.

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

There are other ways that use many diodes. Has anyone used this particular shift register before? To change any data in the shift register at all, the clock must have a falling edge. Yes, I finally have a reason to use the “diagonal diode” symbol in CircuitLab. I’ll take it from there. There’s no single pin that performs a “latch” function. That looks like Trevor’s “Visio-Lab”. You need to define what is to happen when 1 a second key is pressed while the first is held down 2 when the datazheet key is released before the first and 3 when the second key is released after the first.


You won’t be able to use your common ground switch arrangement but all other potential datasheett will be solved. Pressing SW4 pulls down IN2. The Data Available will return high to indicate acceptance of the new key after a normal debounce period. dataeheet

Anyone want to make some money via online consulting? That will mean you only need three pins on the micro and a suitable 74ls63 to manipulate the shift register. I’ve just acquired two 74LSs and need help understanding the datasheet.

(PDF) 74LS Datasheet PDF Download – BIT SHIFT REGISTERS

But it’s better to show them here for completeness, remember next person searching the web and finding this question may have a different micro or idea in his head. Load from the switches into the shift register all 16 switches attached to 16 pullups, then step feed the word back to the satasheet.

Such an arrangement is called a “diode matrix”.

With all of these you would need to handle debounce in code. You need to modify your question to clarify that you want to prevent two button pressed simultaneously giving an erroneous code.


Datsheet I gather that you also want to be able to somehow recognize N-key press events? Another alternative is to turn your buttons into a rudimentary digital to analog convertor and feed that analog value into whatever datasheer to digital convertor you may have available. Pressing SW1 pulls down IN0 only. FYI, The most useful functions: Sign up using Email and Password. Sign up using Facebook.

I’ve searched the forums and it doesn’t look like anyone has asked this yet.

(PDF) 74LS673 Datasheet download

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. As in the picture: Add pullup resistors if necessary. The MM74C key encoder. 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.