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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HEFBP – Nexperia – PCB Footprint & Symbol Download
Strange behavior from a Johnson counter Ask Question. It would explain exactly the behavior you describe. A microcontroller driven clock will not bounce, so no Scmitt needed.
Although a only cycles through ten states, there are 32 states in which it might power up if reset is grounded. I’m actually planning to use this to drive some transistors, so the current I’m getting right now is more than enough.
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Sign up using Email and Password. So am I missing something or is the part damaged? 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.
The other outputs are behaving normally. Sign up or log in Sign up using Google. YMMV but may not. The downside is that, LED drive wise, the Schmitt version can not pull the skin off a rice pudding. Russell McMahon k 9 Do all of the other channels behave as expected?
I’m expecting the counter to go through the LEDs as described in this diagram from the datasheet:. Would a Schmitt trigger be needed even then? One should not be hef4017vp if a acts strangely on startup, though it should start acting normally within 11 clocks, or if a reset pulse is received.
The rest are working as expected.
In the end, I’ll be driving the pin from a microcontroller. Sign up using Facebook. Is Q2 the only one out of place?
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Yes, it is shown as buffered, hef401b7p In those cases, it’s off. A look at the data sheet shows that the one you have is as bad or worse. I guess the polarity of the LED at Q2 is wrong. Looks like that could be the result. Datasheer as a guest Name.
I removed the pin 12 LED and there were no changes to behavior. Instead of that happening, Q2 is always on, except when it should be on. The design of the chip is such that if it’s in one of the 22 weird states it will progress to a “legitimate” xatasheet within 11 clock pulses.
I’m expecting the counter to go through the LEDs as described in this diagram from the datasheet: 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 datazheet LEDs isn’t important for me, I’m using one resistor for all on them.