74LS164N DATASHEET PDF

Published by on September 30, 2021
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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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Looks pretty clean but you need to zoom way in to know for sure. Sign up using Facebook. 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.

FiddyOhm Reading the datasheet here, I can’t find an issue with the logic levels. Similarly the IC requires only an external clock signal to make its outputs swing into action and produce interesting logic sequences. 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.

Thus exceeding operating conditions, all bets are off. The measurement or what I think is the measurement number in all the screen shots says 3. This opposite sequencing also takes place in accordance to the rising pulse of the input clocks. 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.

74LS – 8-Bit Shift Register Ser In/Para Out

So I added a schmitt trigger between the raspberry pi and the register clock input, and now it shifts exactly the number I want. Have you ever had bounce problems using a simple microcontroller DIO, especially at low freq? You might simply have a logic level compatibility issue between Pi and the LS inputs. Just disconnect the LEDs and use the scope to check outputs. This opposite sequencing also takes place in accordance to the rising pulse of the input clocks.

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Then I send a clock pulse from the Raspberry Pi go high for ms then go low. Unlike ordinary CMOS ICs which has also been discussed in many of my previous articlesthe above ICs are equipped with datasehet different built-in features which may be datashdet or activated by just applying the appropriate logic inputs or components to their relevant pin-outs. Negative seems to indicate source current, and positive sink current.

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 You likely have reflections on your clock line, causing it to be treated as multiple clock pulses.

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

The length of your clock wire might be a 74ls146n in this. Now suppose if through a simple wiring pins 1 and 2 are configured catasheet 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.

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.

Referring to the figure on the left we see that externally it looks just like an ordinary pin dual in-line chip. When the asker is sourcing more than the chip can do by more than a factor of 10, I’d look there first. The thresholds are 0. Similarly the IC requires only an external clock signal to make its outputs swing into action and produce interesting logic sequences.

Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and What am I doing wrong?

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. A Low power Schottky input typically sits at about 1.

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This chip can’t drive the kind of current you want it to. James Magnus 55 7. That’s a good guess, but the recent oscilloscope pictures posted after your answer looks pretty clean. Thanks for all your advices and suggestions, have a nice day. I use leds to see what happen. Hopefully you will get to see another article pretty soon, which will explain the practical utility of this wonderful IC. Email Required, but never shown. I know there is a pull down and a pull up in the raspberry pi when you configure the GPIO as input, but is 74ls1164n a pull down when you are in output mode?

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

Hopefully you will get to see another article pretty soon, which will explain the practical utility of this wonderful IC. 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.

Hasn’t ever happened to me. Finding out where that offset comes from should be the absolute first priority here.

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. You might even need to replace the shift register, but probably not. Also, why does the scope only show 2Vpp in one picture? Perhaps this has darasheet to do with your problem. The serial inputs pin 1 and 2 of the IC has a special purpose of resetting the above procedure in an interesting pattern.

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