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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Not shown on the schematic is the decoupling capacitor, also nF. I’m expecting the counter to go through the LEDs as described in this diagram from the datasheet:.
Instead of that happening, Q2 is always on, except when it should be on.
In those cases, it’s off. The other outputs are behaving normally. 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 datssheet object before actually doing anything with it, so it shouldn’t be damaged by ESD.
Hef4017bp datasheet pdf
Yes, it is shown as buffered, but My reasonably xtensive experienc with this IC using a switch as a clock source is that the Schmitt version is needed. YMMV but may not. The downside is that, LED drive wise, the Schmitt version can not pull the skin off a rice pudding. A look hf4017bp the data sheet shows that the one you have is as bad or worse. I guess the polarity of the LED at Q2 is ddatasheet.
HEFBP datasheet & applicatoin notes – Datasheet Archive
The picture shows how current would flow if e. It would explain exactly the behavior you describe.
Kris Bahnsen Only Q2 seems problematic. The rest are working as expected. Although a only cycles through ten states, there are 32 states in which it might power up if reset is grounded. The design of the chip dataeheet such that if it’s in one of the 22 weird states it will progress to a “legitimate” state within 11 clock pulses. 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.
Russell McMahon k 9 I removed the pin 12 LED and there were no changes to behavior. I’m actually planning to use this to drive some transistors, so the current I’m getting right now is more than enough.
I picked LEDs just to play a dataxheet bit catasheet the device and this seems to be the Hello World project for In the end, I’ll be driving the pin from a microcontroller. Would a Schmitt trigger be needed even then? A microcontroller driven clock will not bounce, so no Scmitt needed. It sounds as though your specific IC may be damaged. Looks like that could be the result. I replaced the circuit and it works fine now, but I tested your idea and with it, I get the described behavior.
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HEFBP 데이터시트(PDF) – NXP Semiconductors