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HEFBP, Nexperia Counter ICs 5-ST JOHNSON COUNTER datasheet, inventory, & pricing. Jan 4, 5-stage Johnson counter. For a complete data sheet, please also download: HEFBP(N): lead DIL; plastic (SOT). HEFBD(F). HEFBP HEFB; 5-stage Johnson Counter;; Package: SOT (DIP16). For a complete data sheet, please also download. The IC04 LOCMOS.

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I’m expecting the counter to go through the LEDs as described in this diagram from the datasheet:. Is Q2 the only one out of place? The picture shows how current would flow if e. Email Required, but never shown. Sign up using Email and Password.

I picked LEDs just to play a little bit with the device and this seems to be the Hello World project for 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.

Not shown on the schematic is the decoupling capacitor, also nF. Sign up or dafasheet in Sign up using Google. A look at the data sheet shows that the one you have is as bad or worse. Although a only cycles through ten states, there are 32 states in which it might power up if reset is grounded. I removed the pin 12 LED and there were no changes to behavior. YMMV but may not.

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Hef4017bp datasheet pdf

The other outputs are datashet normally. Do all of the other channels behave as expected? My reasonably xtensive experienc with this IC using a switch as a clock source is that the Schmitt version is needed. Post as a guest Name. One should not be surprised if a acts strangely on startup, though it should start acting normally within 11 clocks, or if a reset pulse is received.

It would explain exactly the behavior you describe.

HEFBP Datasheet PDF – Philips Electronics

It came in stuck to a conductive “sponge” in an antistatic bag and I took the time to touch a grounded object before actually doing anything with it, so it shouldn’t be damaged by ESD.

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Yes, it is shown as buffered, but Kris Bahnsen Only Q2 seems problematic. The rest are working as expected. Looks like that could be the result. The design of the chip is such that if it’s in one of the 22 weird states it hef40117bp progress to a “legitimate” state within 11 clock pulses. In the end, I’ll be driving the pin from a microcontroller.

Russell McMahon k 9 I guess the polarity of the LED at Q2 is wrong. In those cases, it’s hef4071bp. The downside is that, LED drive wise, the Schmitt version can not pull the skin off a rice pudding. Would a Schmitt trigger be needed even then?

I’m expecting the counter to go through the LEDs as described in this diagram from the datasheet: A microcontroller driven clock will not bounce, so no Scmitt needed. Instead of that happening, Q2 is always on, except when it should be on. Post Your Answer Discard 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 datsheet to these policies.

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HEF4017BP Datasheet

datashest I replaced the circuit and it works fine now, but I tested your idea and with it, I get the described behavior. Home Questions Tags Users Unanswered. I’m actually planning to use this to drive some transistors, so the current I’m getting right now is more than enough. It sounds as though your specific IC may be damaged.

So I’m using the pushbutton to drive the clock, the capacitor is there to help with debouncing and since the actual light level of the LEDs isn’t important for me, I’m using one resistor for all on them.

So am I missing something or is the part damaged? Strange behavior from hfe4017bp Johnson counter Ask Question. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.