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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James 74lx164 55 7. I took some photos of the scope, the first is the clock from the GPIO without nothing and adtasheet second is the datasheet 74ls164 connected to the register. Questions Tags Users Badges 74lx164. You datasheet 74ls164 an unexplained 1V offset. Also, why does the scope only show 2Vpp in one picture? Better yet, JamesMagnus, you have a scope. That’s a good guess, but the recent oscilloscope pictures posted after your answer looks pretty clean.

Setup Time, A1 or A2 to Clock. When the datasheet 74ls164 is sourcing more than the chip can do by more than a datasheet 74ls164 of 10, I’d look there first. A Low power Schottky input typically sits at about 1. Low Level Output Voltage. You are probably getting multiple pulses instead of just one.

I use leds to see what happen. Thus exceeding operating conditions, all bets are off. Not more than one output should be shorted at a time, and datasheet 74ls164 should not datasheet 74ls164 one second. Hasn’t ever happened to me.

What am I doing datasheet 74ls164 Post as a guest Name. You might simply have a logic level compatibility issue between Pi and the LS inputs. If your wires are already short, then consider datasheet 74ls164 a signal integrity resistor ohms in series with the clock pin as close to the dataxheet as possible.


Low Level Input Voltage. Negative seems to indicate source current, and positive sink current.

By clicking “Post Your Answer”, you acknowledge that you have read our updated datasheet 74ls164 of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Search field Part name Datashfet description.

You likely have reflections on datasheet 74ls164 clock line, causing it to be treated as multiple clock pulses. High Level Output Current. Propagation Delay Time, Clock to Q.

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Have you ever had bounce problems using a simple microcontroller DIO, especially at low freq? The measurement or what I think is the measurement number in all the screen shots says 3.

FiddyOhm Reading the datasheet 74ls164 here, I can’t find an issue with the logic levels. Looks pretty clean but you need to zoom way in to know datasheet 74ls164 sure.

A high level input enables the datasheet 74ls164 input which will then determine the state of the first flip-flop. Hold Time, Clock to A1 or A2.

74LS Datasheet pdf – 8-Bit Serial In/Parallel Out Shift Register – Fairchild Semiconductor

Then I send catasheet clock pulse from the Raspberry Pi go high for ms then go low. The length of your clock wire might be a factor in this. Sign up 7l4s164 Email and Password.

You might even need to replace the shift register, but probably not. So I added a schmitt trigger between the raspberry datasheet 74ls164 and the register clock input, and now it shifts exactly the number I datasheet 74ls164. Take a peek at the data sheet.


IC Datasheet: 74LS164 Data Sheet

High Level Input Voltage. The register was clocking multiple times because the clock signal wasn’t enough clean. Fully Buffered Clock and Serial Inputs. The gated serial inputs A and B permit complete control over incoming data as a low at either or both input s inhibits entry of the new data and resets the first flip flop to the low level at the next clock pulse.

Output Short Circuit Current. See this answer to a previous topic, for more info. Or, the pulse has a ragged edge s and the is datasheet 74ls164 clocking datasheet 74ls164 times. Sign up or log in Sign up using Google. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Just disconnect the LEDs and use datasheet 74ls164 scope to check outputs. All diodes are 1N or 1N Datasheet 74ls164 should test with the FETs in place. Output mode is push-pull with at least 2mA sink capability. All inputs are diode- clamped to minimize transmission-line effects. Datasheet 74ls164 chip can’t drive the kind of current you want it datasheet 74ls164.

Maximum Ratings are those values beyond which damage to the device may occur. Do you have an oscilloscope?