74HC76 DATASHEET PDF

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If no what’s the matter of my circuit?

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 74h76 J input. It means that if I wire pin 5 to Vcc I got always 10 output.

74HC76 Datasheet Renesas pdf data sheet FREE from

Email Required, but never shown. 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. By clicking “Post Your Answer”, you acknowledge datashest you have read our updated terms of datadheetprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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Sign up or log in Sign up using Google. This is my schematic very basic: By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Do not, ever, disconnect the VCC pin when debugging, because that breaks chips. This is the integrated pinout: Sign up using Email and Password.

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.

74HC76 Datasheet PDF Motorola => Freescale –

About Preset and Clear pin I’m managing them well: Sign up using Facebook. The problem is that in the circuit that I’m observing on my desk the 74hhc76 counter only works when pin 5 Vcc is unwired.

I initialize the first jk with 1 using a button and preset and clear pin. I’m using 74HC76 integrated that contains two jk.

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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 datahseet is 74ch76 taking it low. Thanks for your advice. I’m building a simple ring counter with two jk flip-flop. 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.

JK1 and JK2 need to initialize in opposite states, don’t they?