74LS164N DATASHEET PDF

74LSN from Fairchild Semiconductor. Find the PDF Datasheet, Specifications and Distributor Information. 74LSN Datasheet, 74LSN PDF, 74LSN Data sheet, 74LSN manual, 74LSN pdf, 74LSN, datenblatt, Electronics 74LSN, alldatasheet. These 8-bit shift registers feature gated serial inputs and an asynchronous clear. A low logic level at either input inhibits entry of the new data, and resets the first.

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Better yet, JamesMagnus, you have a scope.

How Would You Build Moving LED Signs Using IC 74LS164? Pin-Outs Explored

The serial inputs pin 1 and 2 of the IC has a special purpose of resetting the above procedure in datashheet interesting pattern. Post as a guest Name.

The thresholds are 0. Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and The whole output array, instead of shutting down dafasheet together, now starts receding sequentially one-next-to-the-other, until all of them are shut down to begin the cycle all over again.

You might even need to replace the shift register, but probably not.

Referring to the figure on the left we see that externally it looks just like an ordinary pin dual in-line chip. You likely have reflections on your clock line, causing it to be treated as multiple clock pulses. dwtasheet

Sign up or log in Sign up using Google. 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. In real I will put mosfets to control a big led board. James Magnus 55 7. Thanks for all your advices and suggestions, have a nice day.

Datasueet Reading the datasheet here, I can’t find an issue with the logic levels. Introduction Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Now suppose if through a simple wiring pins 1 and 2 are configured in such a way that when the eatasheet pin 13 of the IC goes high while sequencing serially, it grounds the serial input 1 and 2. Also, why does the scope only show 2Vpp in one picture? See this answer to a previous topic, for more info. You have an unexplained 1V offset.

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The register was clocking multiple times because the clock signal wasn’t enough clean. The measurement or what Dwtasheet think is the measurement number in all the screen shots says 3.

Cleaning the pulse up with a Schmitt trigger got it working, but is masking the real problem – you Pi’s GPIO line is either not being controlled correctly by your program, or it’s blown up.

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raspberry pi – 8-bit shift register 74LS not working – Electrical Engineering Stack Exchange

This opposite sequencing also takes place in accordance to the rising pulse of the input clocks. Do you have an oscilloscope? 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.

That’s a good guess, but the recent oscilloscope pictures posted after your answer looks pretty clean. For example if the pin — outs 1 and 2 are permanently connected to the positive supply and the reset pin is joined to the last output of the IC pin 13then, as discussed earlier, once all the outputs become high the last pin 13 instantly resets the whole circuit, shutting the whole array of outputs, and the cycle repeats.

Take a peek at the data sheet. Unlike ordinary CMOS ICs which has also been discussed in many of my previous articlesthe above ICs are equipped with many different built-in features which may be accessed or activated by just applying the appropriate logic inputs or components to their relevant pin-outs.

Then I send a clock pulse from the Raspberry Pi go high for ms then go low. When the asker is sourcing more than the chip can do by more than a factor of 10, I’d look there first. Sign up using Email and Password. When I power-on the circuit, all the LEDs are off. The length of your clock wire might be a factor in this. That’s pretty far fetched, given the frequencies involved. Unlike ordinary CMOS ICs which has also been discussed in many of my previous articlesthe above ICs are equipped with many different built-in features which may be accessed or activated by just applying the appropriate logic inputs or components to their relevant pin-outs.

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You might simply have a logic level compatibility issue between Pi and the LS inputs. Introduction Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and This chip can’t drive the kind of current you want it to. Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and If your wires are already short, then consider adding a signal integrity resistor ohms in series with the clock pin as close to the driver as possible.

Finding out where that offset comes from should be the absolute first priority here. Hopefully you will get to see another article pretty soon, which will explain the practical utility of this wonderful IC.

Similarly the IC requires only an external clock signal to make its outputs swing into action and produce interesting logic sequences. I resolved my problem. Now suppose if through a simple wiring pins 1 and 2 are configured in such a way that when the last pin 13 of the IC goes high while sequencing serially, it grounds the serial input 1 and 2.

Just disconnect the LEDs and use the scope to check outputs. Perhaps this has something to do with your problem. You are probably getting multiple pulses instead of just one. The extreme top left pin from the printed side is the first pin in the order, and the pin just opposite to it on the other row is the last or the 14 th pin. Hopefully you will get to see another article pretty soon, which will explain the practical utility of this wonderful IC.

Thus exceeding operating conditions, all bets are off.