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 removed the pin 12 LED and there were no changes to behavior.
It would explain exactly the behavior you describe. I picked LEDs just to play a little bit with the device and this seems to be the Hello World project for I’m actually planning to use this to drive some transistors, so the current I’m getting right now is more than enough.
Looks like that could be the result. The rest are working as expected. Sign up using Email and Password.
Hefbp datasheet pdf
Sign up using Facebook. In those cases, it’s off. 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. I guess the polarity of the LED at Q2 is wrong.
Instead of that happening, Q2 is always on, except when it should be on. Although a only cycles through ten states, there are 32 states in which it might power up if reset is grounded.
I replaced the circuit and it works fine now, but I tested your idea and with it, I get the described behavior. Kris Bahnsen Only Q2 seems problematic.
HEFBP Datasheet(PDF) – NXP Semiconductors
Home Questions Tags Users Unanswered. The design of the chip is such that if it’s in one of the 22 weird states it will progress to a “legitimate” state within 11 clock pulses.
It sounds as though your specific IC may be damaged. Not shown on the schematic is the decoupling capacitor, also nF. The downside is that, LED drive wise, the Schmitt version can not pull the skin off a rice pudding.
Strange behavior from a Johnson counter Ask Question. It came in stuck to a conductive “sponge” in an antistatic bag and I took the time hef40017bp touch a grounded object before actually doing anything with it, so it shouldn’t be damaged by ESD. Do all of the other channels behave as expected?
So am I missing something or is the part damaged?