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: Zolok Gasho
Country: Singapore
Language: English (Spanish)
Genre: Automotive
Published (Last): 14 October 2011
Pages: 297
PDF File Size: 8.1 Mb
ePub File Size: 7.58 Mb
ISBN: 685-5-37504-672-2
Downloads: 93012
Price: Free* [*Free Regsitration Required]
Uploader: Nelabar

A Low power Schottky input typically sits at about 1. This opposite sequencing also takes place in accordance to the rising pulse of the input clocks. 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 Have you ever had bounce problems using a simple microcontroller DIO, especially datasheeet low freq?

Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and You likely have reflections on your clock line, causing it to be treated as multiple clock pulses. This dayasheet can’t drive the kind of current you want it to. Looks pretty clean but you need to zoom way in to know for sure. Referring to the figure on the left we see that externally it looks just like an ordinary pin dual in-line chip.

The thresholds are 0. I resolved my problem. Take a peek at the data sheet. Sign up using Facebook. You are probably getting multiple pulses instead of just one. 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 datashest again.

  BULLSEYE ONE REACTOR PDF

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

Also, why does the scope only show 2Vpp in one picture? 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. 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.

What am I doing wrong? Similarly the IC requires only an external clock signal to make its outputs swing into action and produce interesting logic sequences. You might even need to replace the shift register, but probably not.

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

I use leds to see what happen. Perhaps this has something to do with your problem. 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.

When the asker is sourcing more than the chip can do by more than a factor of 10, I’d look there first. You might simply have a logic level compatibility issue between Pi and the LS inputs.

Home Questions Tags Users Unanswered. Hasn’t ever happened to me. 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. 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 Thanks for all your advices and suggestions, have a nice day.

  LBN 002-01 PDF

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.

FiddyOhm Reading the datasheet here, I can’t find an issue with the logic levels. 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 register.

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.

Post as a guest Name. Just disconnect the LEDs and use the scope to check outputs. Sign up using Email and Password. So I added a schmitt trigger between the raspberry pi and the register clock input, and now it shifts exactly the number I want. Similarly the IC requires only an external clock signal to make its outputs swing into action and produce interesting logic sequences.