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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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.

This opposite sequencing also takes place in accordance to the rising pulse of the input clocks. Thanks for all your advices and suggestions, have a nice day.

When the asker is sourcing more than the chip can do by more than a factor of 10, I’d look there first. Now suppose if through 74ls1164n 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. Hopefully you will get to see another article pretty soon, which will explain the practical utility of this wonderful IC.

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. 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. The thresholds are 0. 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 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.

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

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

Then I send a clock pulse from the Raspberry Pi go high for ms then go low. 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? See this answer to a previous topic, for more info. Referring to the figure on the left we see that externally it 7ls164n just like an ordinary pin dual in-line chip. Referring to the figure on the left we see that externally it looks just like an ordinary pin dual in-line chip.

SN74LSN3 Datasheet(PDF) – TI store

Post as a guest Name. Just disconnect the LEDs and use the scope to check outputs. 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. Take a peek at the data sheet. The length of your clock wire might be a factor in this. 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.

Have you ever had bounce problems using a simple microcontroller DIO, especially at low freq? Sign up or log in Sign up using Google. The register was clocking multiple times because the clock signal wasn’t enough clean. Sign up using Facebook.

Similarly the IC requires only an external clock signal to make its outputs swing into action and produce interesting logic sequences. The serial inputs pin 1 and 2 of the IC has a special purpose of resetting the above procedure in an interesting pattern.

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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 their relevant pin-outs.

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

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.

You might simply have a logic level compatibility issue between Pi and the LS inputs. Might be missing decoupling capacitors too. That’s a good guess, but the recent oscilloscope pictures posted after your answer looks pretty clean. I use leds to see what happen. Looks pretty clean but you need to zoom way in to know for sure.

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

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

Output mode is push-pull with at least 2mA sink capability.

Also, why does the scope only show 2Vpp in one picture? You are probably getting multiple pulses instead of just one. In real I will put mosfets to control a big led board.