74HC76 DATASHEET PDF

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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 Motorola => Freescale –

JK1 and JK2 need to initialize in opposite states, don’t they? About Preset and Clear pin I’m managing them well: Without a resistor in series with each LED is is likely datasheeet 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.

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Home Questions Tags Users Unanswered. Do not, ever, disconnect the VCC pin when debugging, because that breaks chips.

74HC76 Datasheet

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I’m using 74HC76 integrated that contains two jk. Post Your Answer Discard 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.

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. Thanks for your advice. The problem is that in the circuit that I’m observing on my desk the ring counter only works when pin 5 Vcc is unwired. Sign up using Facebook. Email Required, but never shown. Sign up using Email and Password.

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I’m building a simple ring counter with two jk flip-flop. How do you ensure this?

I initialize the first jk with 1 using a button and preset and clear pin. 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.

This is the integrated pinout: Sign up or log in Sign up using Google.

It means that if I wire pin 5 to Vcc I got always 10 output. This is my schematic very basic: If no what’s the matter of my circuit?