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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In those cases, it’s off.
Hef4017bp datasheet pdf
I replaced the circuit and it works fine now, but I tested your idea and with it, I get the described behavior. Yes, it is shown as buffered, but I guess hef4017hp polarity of the LED at Q2 is wrong.
I picked LEDs just to play a little bit with the device and this seems to be the Hello World project for Sign up using Email and Password. Would a Schmitt trigger be needed even then? In the end, Heg4017bp be driving the pin from a microcontroller. Home Questions Tags Users Unanswered.
Russell McMahon k 9 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’m expecting the counter to go through the LEDs datasneet described in this diagram from the datasheet: 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.
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. Do all of the other channels behave as expected?
The design of the chip is such that if hwf4017bp in one of the 22 weird states it will progress to a “legitimate” state within 11 clock pulses. The picture shows how current would flow if e. Kris Bahnsen Only Q2 seems problematic.
HEFBP datasheet & applicatoin notes – Datasheet Archive
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. Looks like that could be the result.
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Is Q2 the only one out of place? So am I missing something or is the part damaged? The rest are working as expected. I removed the pin 12 LED and there were no changes to behavior.
It sounds as though your specific IC may be damaged. YMMV but may not. The downside is that, LED drive wise, the Schmitt version can not pull the skin off a rice pudding. My reasonably xtensive experienc with this IC using a switch as a clock source is that the Schmitt version hf4017bp needed.