Ximi Elga

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.

Author: Faejind Vojar
Country: Benin
Language: English (Spanish)
Genre: Love
Published (Last): 4 November 2008
Pages: 34
PDF File Size: 15.56 Mb
ePub File Size: 17.76 Mb
ISBN: 855-4-65678-458-2
Downloads: 63028
Price: Free* [*Free Regsitration Required]
Uploader: Shazil

The serial inputs pin 1 and 2 of the IC has a special purpose of resetting the above procedure in an interesting pattern. You are probably getting multiple pulses instead of just one. This opposite sequencing also takes place in accordance to the rising pulse of the input clocks.

The serial inputs pin 1 and 2 of the IC has a special purpose of resetting the above procedure in an interesting pattern.

When the asker is sourcing more than the chip can do by more than a factor of 10, I’d look there first. Hopefully you will get to see another article pretty soon, which will explain the practical utility of this wonderful IC.

Just disconnect the LEDs and use the scope to check outputs. The thresholds are 0. Post as a guest Name. This opposite sequencing also takes place in accordance to the rising pulse of the input clocks. The register was clocking multiple times because the clock signal wasn’t enough clean. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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

Or, the pulse has a ragged edge s and the is actually clocking several times. I resolved my problem.

That’s pretty far fetched, given the frequencies involved. When I power-on the circuit, all the LEDs are off. James Magnus 55 7. Perhaps this has something to do with your problem.

  ATILIO MARCOLLI PDF

See this answer to a previous topic, for more info.

The length of your clock wire might be a factor in this. Better yet, JamesMagnus, you have a scope. So I added a schmitt trigger between the raspberry pi and the register clock input, and now it shifts exactly the number I want.

Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and Take a peek at the data sheet. Referring to the figure on the left we see that externally it looks just like an ordinary pin dual in-line chip. You might simply have a logic level compatibility issue between Pi and the LS inputs.

The measurement or what I think is the measurement number in all the screen shots says 3. What am I doing wrong? Output mode is push-pull with at least 2mA sink capability.

74LSN NTE Equivalent NTE74LS IC-TTL 8-BIT SHIF – Wholesale Electronics

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policydatasheet that your continued use of the website is subject to these policies. 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.

Might be missing decoupling capacitors too. That’s a good guess, but the recent oscilloscope pictures posted after your answer looks pretty clean. Now suppose if through a simple wiring datssheet 1 and 2 are configured in such a way that when the last pin 13 of the IC goes high datasheeh sequencing serially, it grounds the serial input 1 and 2.

  HISTORIA DE MEXICO GLORIA M DELGADO DE CANTU PDF

For example if datasheeg 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 datasbeet 13 instantly resets the whole circuit, shutting the whole array of outputs, and the cycle repeats.

You might even need to replace the shift register, but probably not. 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 I took some photos of the scope, the first is the clock from the GPIO without nothing and the second is the clock connected to the datasheft.

The whole output array, instead of shutting down all together, now starts receding sequentially one-next-to-the-other, until all of them are shut down to begin the cycle all over again.

Do you have an oscilloscope? Email Required, but never shown.

Also, why does the scope only show 2Vpp in one picture? Hopefully you will get to see another article pretty soon, which will explain the practical utility of this wonderful IC. Sign up using Email and Password. Home Questions Tags Users Unanswered. If your wires are already short, then datasheett adding a signal integrity resistor ohms in series with the clock pin as close to the driver as possible.

I know there is a pull down and a pull up in the raspberry pi when you configure the GPIO datsheet input, but is there a pull down when you are in output mode?

You have an unexplained 1V offset. Sign up using Facebook.