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, but never shown. So am I missing something or is the part damaged?
HEF4017BP PDF Datasheet浏览和下载
In the end, I’ll be hsf4017bp the pin from a microcontroller. Is Q2 the only one out of place? I replaced the circuit and it works fine now, but I tested your idea and with it, I get the described behavior.
It came in hed4017bp 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. Although a only cycles through ten states, there are 32 states in which it might power up if reset is grounded.
Home Questions Tags Users Unanswered. I guess the polarity darasheet the LED at Q2 is wrong. Yes, it is shown as buffered, but In those cases, it’s off. Strange behavior from a Johnson counter Ask Question. Russell McMahon k 9 I removed the pin 12 LED and there were no changes to behavior.
Do all of the other channels behave as expected? I picked LEDs just to play a little bit with the device and this seems to be the Hello World project for The picture shows how current would flow if e. Would a Schmitt trigger be needed even then? Sign up or log in Sign up using Google. Looks like that could be the result.
So I’m using the pushbutton to drive the clock, the capacitor is there to help hef40177bp debouncing and since the actual light level of the LEDs isn’t important for me, I’m using one resistor for all on them. Not shown on the schematic is the decoupling capacitor, also nF. Kris Bahnsen Only Q2 seems problematic.
Post as a guest Name. My reasonably xtensive experienc with this IC using a switch as a clock source is that the Schmitt version is needed. Hef4017b; look at the data sheet shows that the one you have is as bad or worse.
I’m actually planning to use this to drive some transistors, so the current I’m getting right now is more than enough. I’m datashet the counter to go through the LEDs as described in this diagram from the datasheet: 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.
It sounds as though your specific IC may be damaged.
HEFBP Datasheet pdf – 5-stage Johnson decade counter – NXP Semiconductors
It would explain exactly the behavior you describe. Instead of that happening, Q2 is always on, except when it should be on. Sign up using Facebook. A microcontroller driven clock will not bounce, so no Scmitt needed.
The design of the chip is such that if it’s in one of the 22 weird states it will progress to a “legitimate” dataxheet within 11 clock pulses.