74HC76 DATASHEET PDF

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This is my schematic very basic: Email Required, but never shown.

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I’ve a button that sets the starting 1 in the first jk, so I think that the problem isn’t about Preset or Clear pin. Post as a guest Name.

74HC76 Datasheet PDF

The problem is that in datashset circuit that I’m observing on my desk the ring counter only works when pin 5 Vcc is unwired. It means that if I wire pin 5 to Vcc I got always 10 output.

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I initialize the first jk with 1 using a button and preset and clear pin. 74jc76 a resistor in series with each LED is is likely that the corresponding Q output is being dragged down to a voltage that is not high enough to be recognized as a legitimate high level by the following J input. Home Questions Tags Users Unanswered.

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If no what’s the matter of my circuit? Thanks for your advice.

On CMOS parts, all unused inputs must be connected, directly or through a resistor, to either Vcc or ground, whichever is required to make the part work as required. I’m building a simple ring counter with two jk flip-flop.

Do not, ever, disconnect the VCC pin when debugging, because that breaks chips. About Preset and Clear pin I’m managing them well: JK1 and JK2 need to initialize dtaasheet opposite states, don’t they?

74HC76 Datasheet

I’m using 74HC76 integrated that contains two jk. Sign up using Email and Password. This is the integrated pinout: By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Sign up or log in Daatsheet up using Google.

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74HC76 Datasheet PDF –

For the Preset pin where you have a switch to pull it to ground, you must also have a resistor 5K – 10K to Vcc to ensure the preset pin is high when the switch is not taking it low. Sign up using Facebook.

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