74HC76 DATASHEET PDF

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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms datasheeet Service. I’m building a simple ring counter with two jk flip-flop.

I’m using 74HC76 integrated that contains two jk. The problem is that in the circuit that I’m observing on my desk the ring counter only works when pin 5 Datashewt is unwired. It means that if I wire pin 5 to Vcc I got always 10 output. If no what’s the matter of my circuit? I initialize the first jk with 1 using a button and preset and clear pin.

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Without 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.

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.

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. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Home Questions Tags Users Unanswered.

This is the integrated pinout: This is my schematic very basic: Do not, ever, disconnect the VCC pin when debugging, because that breaks chips. JK1 and JK2 need to initialize in opposite states, don’t they?

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(PDF) 74HC76 Datasheet download

How do you ensure this? Thanks for your advice. About Preset and Clear pin I’m managing them well: I’ve a dtasheet that sets the starting 1 in the first jk, so I think that the problem isn’t about Preset or Clear pin. Sign up or log in Sign up using Google.

74HC76 Datasheet PDF Motorola => Freescale –

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