74HC76 DATASHEET PDF

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I’m building a simple ring counter with two jk flip-flop. I’m using 74HC76 integrated that contains two jk. The problem dwtasheet that in the circuit that I’m observing on my desk the ring counter only works when pin 5 Vcc is unwired.

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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 datasehet 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 74hx76 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.

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.

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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.

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JK1 and JK2 need to initialize in opposite states, don’t they? How do you ensure this? Thanks for your advice.

About Preset and Clear pin I’m managing them well: 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. Sign up or log in Sign up using Google. Ddatasheet up using Facebook. Sign up using Email and Password.

74HC76 Datasheet Renesas pdf data sheet FREE from

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