74HC164 LED DRIVER

The same clock signal is shared between all shift registers. Sign up using Email and Password. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. The 8th bit is pushed out of the shift register into its overflow bit not shown in the animation. You can go on chaining several registers like this, each adding 8 bits to the setup. Spehro Pefhany k 4

Uploader: Zulukazahn
Date Added: 22 August 2004
File Size: 23.83 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 39240
Price: Free* [*Free Regsitration Required]

There is a potentially better way – actually two ways. This will produce a slight flicker in the ON part of the bar graph, but this will generally be better that a ghost illumination of the OFF part. Earlier in the week, Jason emailed to ask exactly what the problems were with using a shift 74c164 to drive eight LEDs.

I suggest using the 74HC instead, which has a latch and is also very cheap. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms ,ed serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Arduino Controlling 74C Shift Register

The 8th bit is pushed out of the shift register into its overflow bit not shown in the animation. My guess is that you are just going to need to build the circuit and measure the Q7 delay under the specific conditions you intend to use. Home Questions Tags Users Unanswered.

  ACER 5672 ORBICAM DRIVER DOWNLOAD

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie 74ch164and that your continued use of the website is subject to these policies. I don’t understand why next shift register is connected to last output of previous register.

Now provide a clock and a direction line. That will allow you to feed other 8 bits into the chain. As Joe Hass says, the datasheet spec is at 50pF, which should be reasonably conservative for this application if the parts are all in close proximity on a board. That pushes all the bits on all registers one position to the right. I was looking for some ideas and I found this 74h1c64 LED driver: You can chain two of these together by linking the last bit of the first register to the serial input of the next.

Now we’re trying to create a circuit board on a relatively small space, and don’t really want the components to be all that obtrusive since the panel, once soldered up, is supposed to be the wall of a sci-fi interior.

Although not too obvious in the video, because of the camera frame rate, every now 74hc64 again you can see a visible flicker as the LED patterns update. Ricardo 4, 14 37 The same clock signal is shared between all shift registers.

We’ve gone for 74HC shift registers, over the s, because these don’t require a latch line; this means that the outputs change immediately as the data is shifted in, but it also means one less connector on every PCB section. This delay will also depend on the loading of the resistor and LED connected to Q7. He’s used numerous ‘ shift registers in his POV globe successfully, and never had a problem with multiple LEDs lighting up and causing the display to dim.

  HP PHOTOSMART PRO B9180 PRINTER DRIVER

You can go on chaining several registers like this, each adding 8 bits to the setup. Huh I was thinking about much lower frequencies kHz or something. Circuit will be similar to this: Kamil 4, 6 26 Tie the left input high, and the right input low.

Posted by Chris Holden at 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.

What does the 74HC data sheet say? Home Questions Tags Users Unanswered. Then, when you want to load new data, reset all the shift registers and then shift the appropriate number of clock pulses. You will need to, or you’re going to see ghosting.

Arduino Controlling 74C164 Shift Register

Therefore, the data sheet did not provide enough information to answer your question. Ah, now I see. I checked one manufacturer’s data sheet and found that the Q7 propagation delay was specified with a capacitive load of 50 pF but there was no information about how the delay varied as a function of the capacitance, and the data sheet assumed that the load was purely capacitive no d.