Output Spike on CD4013 Flip Flop
- Thread starter CingKrab
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amb
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Do you have a decoupling capacitor next to each chip? If not you should. Maybe the inductance in the lines/wires of the power/ground wiring is glitching.
CingKrab
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I do have a 0.1 uF cap next to the Vdd pin of every chip I'm using. Is that big enough? I don't know anything about the inductance though. It is, however, the closest chip to the power/ground lines.
amb
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0.1uF next to each chip should be enough; oh well, that was a shot in the dark.
CingKrab
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So does anyone have any ideas? I'd appreciate any input you guys might have.
rickcr42
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sounds like "bounce" from the mechanical PB Switch
Check out some debounce circuits
Check out some debounce circuits
stackofhay
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You might consider adding a classic power up reset circuit to your board, so the ring counter and other elements remain in a reset state until the power rails come up to valid levels.
During the time the power rails are slewing, it's hard to predict the exact behavior of the circuit, so it's best just to keep everything reset until the rails have stabilized to a level that is in the spec'd operating range for the parts used in the circuit.
... just a thought
During the time the power rails are slewing, it's hard to predict the exact behavior of the circuit, so it's best just to keep everything reset until the rails have stabilized to a level that is in the spec'd operating range for the parts used in the circuit.
... just a thought