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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Email Required, hdf4017bp never shown. The rest are working as expected. I replaced the circuit and it works fine now, but I tested your idea and with it, I get the described behavior. YMMV but may not. Is Q2 the only one out of place? In the end, I’ll be driving the pin from a microcontroller.
I removed the pin 12 LED and there were no changes to behavior.
Hef4017bp datasheet pdf
Russell McMahon k 9 Home Questions Tags Users Unanswered. I’m expecting the counter to go through the LEDs as described in this diagram from the datasheet:. In those cases, it’s off.
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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. I picked LEDs just to play a little bit with the device and this seems to be the Hello World project for Looks like that could be the result. A microcontroller driven clock will not bounce, so no Scmitt needed.
My reasonably xtensive experienc with this IC using a switch as a clock source is that the Schmitt version is needed. Yes, it is shown as buffered, but 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.
The design of the chip is such that if it’s datsaheet 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.
Kris Bahnsen Only Q2 seems problematic. Post as a guest Name. So am I missing something or is the part damaged?
The picture shows how current would flow if e. Strange behavior from a Johnson counter Ask Question. I’m expecting the counter to go through the LEDs as described in this diagram from the datasheet: Sign up or log in Sign up using Google. Would a Schmitt trigger be needed even then?
Sign up using Email and Password. Do all of the other channels behave as expected? It would explain exactly the behavior you describe. 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.
Although a only cycles through ten states, there are 32 states in which it might power up if reset is grounded.