Part Number: 74LS, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor. 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. 74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, 8-Bit Serial In/Parallel Out Shift Register.

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FiddyOhm Reading the datasheet here, I can’t find an issue with the logic levels. Low Level Input Current. datasheet 74ls164

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High Level Input Current. Post as a guest Name. Search datasheet 74ls164 Part name Part description. That’s pretty far fetched, given the frequencies involved. Better yet, JamesMagnus, datasheet 74ls164 have a scope. High Level Xatasheet Voltage. Output Short Circuit Current. Take a peek at the data sheet.

datasheet 74ls164 You should test with the FETs in place. Propagation Delay Time, Reset to Q. This chip can’t drive the kind of current you want it to. I datasheet 74ls164 my problem. The register was clocking multiple times because the clock signal wasn’t enough clean. Low Level Output Voltage. This 8-bit shift register features gated serial inputs and an.


Sign up using Email and Password. 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. You have an unexplained 1V offset. In real I will put mosfets to control a datasheet 74ls164 led board.

Have you ever had bounce problems using a simple microcontroller DIO, especially at low freq?

Looks datasheet 74ls164 clean but you need to zoom way in to know for sure. The thresholds are 0.

74LS Datasheet(PDF) – Hitachi Semiconductor

James Magnus 55 7. You might even need to replace dataasheet datasheet 74ls164 register, but probably not. Negative seems to indicate source current, and positive datasheet 74ls164 current. All diodes are 1N or 1N See this answer to a previous topic, for more info.

By clicking datasheet 74ls164 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. Sign up or log in Sign up using Google. Hasn’t ever happened to me. Also, why does the scope only show 2Vpp in one picture? Thus exceeding operating conditions, all bets are off. Thanks for all your datasheet 74ls164 and suggestions, have a nice day. This site uses cookies to deliver our services and to show you relevant ads and job listings.


Not more datasheet 74ls164 one output should be shorted at a time, and duration should not exceed one second. Finding out where that offset comes from should be the absolute first priority here.

Might be missing decoupling capacitors too. A high level input enables the other input which will then determine the state of datasheet 74ls164 first flip-flop. I use leds to see what happen. So I added a schmitt trigger between the raspberry pi and the register clock input, datasheet 74ls164 now it shifts exactly the number I want.

Setup Time, A1 or A2 to Clock. All inputs are diode- clamped to minimize transmission-line effects. You might simply have a logic level compatibility issue between Pi and the LS inputs. What am I doing wrong?

High Level Input Voltage. Cleaning the pulse up with a Schmitt datasheet 74ls164 got it working, but datasheet 74ls164 masking the real problem – you Pi’s GPIO line is datashwet not being controlled correctly by your program, or it’s blown up. You likely have reflections on your clock line, causing it to be treated as multiple clock pulses.