74LS164N DATASHEET PDF

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

That’s a good guess, but the recent oscilloscope pictures posted after your answer looks pretty clean. The extreme top left pin from 74lw164n printed side is the first pin datasheef the order, and the pin just opposite to it on the other row is the last or the 14 th pin.

Finding out where that offset comes from should be the absolute first priority here. Take a peek at the data sheet. The measurement or what I think is the measurement number in all the screen shots says 3.

Do you have an oscilloscope? The length of your clock wire might be a factor in this. Then I send a clock pulse from the Raspberry Pi go high for ms then go low. I use leds to see what happen. The extreme top left pin from the printed side is the first pin in 74l1s64n order, and the pin just opposite to it on the other row is the last or the 14 th pin.

Referring to the figure on the left we see that externally it looks just like an ordinary pin dual in-line chip. The serial inputs pin 1 and 2 of datasueet IC has a special purpose of resetting the above procedure in an interesting pattern. 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 datasheer, shutting the whole array of outputs, and the cycle repeats.

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What am I doing wrong? Have you ever had bounce problems using a simple microcontroller DIO, dqtasheet at datasheer freq? 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.

When I power-on the circuit, all the LEDs are off. Sign up using Facebook. A Low power Schottky input typically sits at about 1. Through a few of my previous articles I 74le164n tried to cover the working principles of a couple of versatile ICs like the and You have an unexplained 1V offset.

Thus exceeding operating conditions, all bets are off. Cleaning the pulse up with a Schmitt trigger got it working, but is masking the real problem – you Pi’s GPIO line is dattasheet not being controlled correctly by your program, or it’s blown up. Or, the pulse has a ragged edge s and the is actually clocking several times.

Thanks for all your advices and suggestions, have a nice day dstasheet. This chip can’t drive the kind of current you want it to.

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 datahseet 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.

Similarly the IC requires only an external clock signal to make its outputs swing into action and produce interesting logic sequences. 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.

Home Questions Tags Users Unanswered. Perhaps this has something to do with your problem. You should test with the FETs in place. When the asker is sourcing more than the chip can do by more than a factor of 10, I’d look there first. I know there is a pull down and a pull up in the raspberry pi when you configure the GPIO as input, but is there a pull down when you are in output mode?

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Better yet, JamesMagnus, you have a scope. Introduction Through a few of my previous articles I have tried to cover dwtasheet working principles of a couple of versatile ICs like the 74ls164 In real I will put mosfets to control a big led board. The serial inputs pin 1 and 2 of the IC has a special purpose of resetting the above procedure in an interesting pattern.

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

The register was clocking multiple times because the clock signal wasn’t enough clean. Referring to the figure on the left we see that externally it looks just like an ordinary pin dual in-line chip. Hopefully you will get to see another article pretty soon, which will explain the practical utility of this wonderful IC. That’s pretty far fetched, given the frequencies involved. I resolved my problem.

Email Required, but never shown. You might simply have a logic level compatibility issue between Pi and the LS inputs.

SN74LSN3 Datasheet(PDF) – TI store

The thresholds are 0. Sign up or log in Sign up using Google. Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and datasheeet This opposite sequencing also takes place in accordance to the rising pulse of the input clocks.

Negative seems ratasheet indicate source current, and positive sink current. 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. 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 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 adtasheet relevant pin-outs.

James Magnus 55 7.