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 replaced the circuit and datassheet works fine now, but I tested your idea and with it, I get the described behavior. Would a Schmitt trigger be needed even then? I removed the pin 12 LED and there were no changes to behavior. Kris Bahnsen Only Q2 seems problematic. Sign up or log in Sign up using Google.
The picture shows how current would flow if e. Is Q2 the only one out of place? It would explain exactly dayasheet behavior you describe. Sign up using Facebook.
The rest are working as expected. 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. Home Questions Tags Users Unanswered.
HEFBP – Nexperia – PCB Footprint & Symbol Download
In the end, I’ll be driving the pin from a microcontroller. 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. YMMV but may not. I’m expecting the counter to go through the LEDs as described in this diagram from the datasheet:. So am I missing something or is the part damaged? I’m actually planning to use this to drive some transistors, so the current I’m getting right now is more than enough.
I guess the polarity of the LED at Q2 is wrong. My reasonably xtensive experienc with this IC using a switch as a clock source is that the Schmitt version is needed. I’m expecting the counter to go through the LEDs as described in this diagram from the datasheet: The downside is that, LED drive wise, the Schmitt version can not pull the skin off a rice pudding.
Looks like that could be the result. Instead of that happening, Q2 is always on, except when it should be on. 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.
Hef4017bp datasheet pdf
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. A look at hef44017bp data sheet shows that the one you have is as bad or worse. Yes, it is shown as buffered, but In those fatasheet, it’s off. Although a only cycles through ten states, there are 32 states in which it might power up if reset is grounded.