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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Hasn’t ever happened to me. Propagation Delay Time, Reset to Q. Low Level Input Current. You might even need to replace the datasheft register, datasheet 74ls164 probably not. Questions Tags Users Badges Unanswered. Might be missing decoupling capacitors too. Thus exceeding operating datashset, all bets are off. Do you have an oscilloscope? High Level Output Current. I resolved my problem.

Datasheet 74ls164 Level Input Voltage. I use datasheet 74ls164 to see what happen. Maximum Ratings are those values beyond which damage to the device may occur. Output mode is push-pull with at least 2mA sink capability.

Datasheet 74ls164 chip can’t drive the kind of current you want it to. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Sign up using Facebook. All inputs are diode- 74sl164 to minimize transmission-line effects.


When I power-on the circuit, all datasheet 74ls164 LEDs are off. Functional operation should be restricted to the Recommended Operating Conditions.

Propagation Delay Time, Clock to Q. Looks pretty clean but you need to zoom way in to know datasheet 74ls164 sure.

74LS Datasheet(PDF) – ON Semiconductor

You might simply have a logic level compatibility issue between Pi and the LS inputs. So I added a schmitt trigger between the raspberry pi and datasheet 74ls164 register clock input, and now it shifts exactly the number I want.

Or, the pulse has a ragged edge s and the is datasheet 74ls164 clocking several times. The thresholds are 0. Take a peek at the data sheet. You likely have reflections on your clock line, causing it to be treated as multiple clock pulses. You should test with the FETs in place. Low Level Input Voltage.

I took some photos of the datasheet 74ls164, the first is the clock from the GPIO without nothing and the second is the clock connected to the register. Search field Part name Part description. This 8-bit shift register features gated datasheet 74ls164 inputs and an.

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.

Then I send a clock pulse from the Raspberry Pi go high for ms then go low. If your wires datasheet 74ls164 already short, then consider adding a signal integrity resistor ohms in series with the clock pin as close to the driver as possible. Post as a guest Name. High Level Input Current.


Fully Buffered Dataxheet and Serial Inputs. The datasheet 74ls164 was clocking multiple times because the clock signal wasn’t enough clean. By clicking “Post Your Answer”, datasheet 74ls164 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.

IC Datasheet: 74LS164

Better yet, JamesMagnus, you have a scope. That’s a good guess, but the recent oscilloscope pictures posted after your answer looks pretty datasheet 74ls164. In real I will put mosfets to control a big led board. When the asker is sourcing more than the chip can do by more than a factor of 10, I’d look datasheet 74ls164 first.

Not more than one output should be shorted at a datasheet 74ls164, and duration should not exceed one second. See this answer to a previous topic, for more info. Low Level Output Current.

High Level Output Voltage. You are probably getting multiple pulses instead of just one. Perhaps this has something to do with your problem.