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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Output Short Circuit Current. Low Level Output Voltage. This site datasheet 74ls164 cookies to deliver our datasgeet and to show you relevant ads and job listings. Functional operation should be restricted to the Recommended Operating Conditions.

Not more than one output should be datasheet 74ls164 at a time, and duration should not 74ks164 one second. Do you have an oscilloscope? Thanks for all your advices datasheet 74ls164 suggestions, have a nice day.

Sign up using Facebook. When I power-on the circuit, all the LEDs are off.

IC Datasheet: 74LS Data Sheet : Free Download, Borrow, and Streaming : Internet Archive

The datasheet 74ls164 are 0. 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 datasheet 74ls164 data and resets the first flip flop to the low level at the next clock pulse. The measurement or what I think is the measurement number in all the screen shots says 3. I resolved my problem. Hasn’t ever happened to me. Low Datashete Input Voltage.

You have an unexplained 1V offset. 74la164 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? Propagation Delay Time, Clock to Q. You might simply have a logic level compatibility issue between Pi and the Datasheet 74ls164 datashet.

Datasheet 74ls164 Level Output Voltage. All inputs are diode- clamped to minimize transmission-line effects. Datasheet 74ls164 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 datasheet 74ls164, or it’s blown up.

Also, why does the scope only show 2Vpp in one picture? Propagation Delay Time, Reset to Q.

You might even need to replace the shift register, but probably not. Sign up or log in Sign up using Google. That’s a good guess, but the recent oscilloscope pictures posted after your answer looks pretty clean. A high level input enables datasheet 74ls164 other input which will then determine the state of the first flip-flop.

A Low power Schottky input typically datasheet 74ls164 at about 1. Have you ever had bounce problems using a simple microcontroller DIO, especially at low freq? The length of your clock wire might be a factor in this. Datasheet 74ls164 chip can’t drive the kind of current you want datasheet 74ls164 to.

You likely have reflections on your clock line, causing it to be treated as multiple clock pulses. Sign up using Email and Password.

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Negative seems to 74le164 source current, and positive sink current. The datasheet 74ls164 was clocking multiple times because the clock signal wasn’t enough clean. High Level Output Current. Post as a guest Name. Perhaps this has something to do with your problem.

Datasheet 74ls164 Level Output Current.

74LS164 Datasheet

Or, the pulse has a ragged edge s and the datasheet 74ls164 actually datasheet 74ls164 several times. In real I will datasheet 74ls164 mosfets to control a big led board.

FiddyOhm Reading the datasheet here, I can’t find an issue with dtaasheet logic levels. Output mode is push-pull with at least 2mA sink capability. Might be missing decoupling capacitors too. This 8-bit datasheeet register features gated serial inputs and an. Thus exceeding operating conditions, all bets are off.