74HC Flip Flops are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 74HC Flip Flops. 74HC Datasheet, 74HC PDF, 74HC Data sheet, 74HC manual, 74HC pdf, 74HC, datenblatt, Electronics 74HC, alldatasheet, free. 74HC datasheet, 74HC circuit, 74HC data sheet: PHILIPS – Dual JK flip-flop with set and reset; positive-edge trigger,alldatasheet, datasheet.

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And don’t think that you can ignore the inputs of an unused part of the circuit, such as the unused flip-flop in your 74HC I’m using an SN74HC dual j-k” flip-flop chip. Sign up using Facebook.

Sometimes that works, and sometimes it doesn’t. LED lights up but does not toggle. 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.

74HC Datasheet PDF – Philips Electronics

Home Questions Tags Users Unanswered. Caps are cheap and don’t take up much space, but the problems arising from not enough of them can be hard to diagnose.

dagasheet Just to show what I’m talking about, once you’ve got the circuit working, put an LED directly to ground on the flip-flop clock input, and watch what happens.


When the circuit is powered, the led turns on but does not toggle when the momentary switch is pressed and released. You need a de-bouncing circuit to feed the flip-flop’s clock input. John Honniball 2, 6 9. As others have suggested, this could be a simple R-C network, or as a better option, use an SPDT change-over switch and a set-reset SR flip-flop as a de-bouncer.

In this case, it will show up as intermittent operation of the flip-flop, depending on whether or 74nc109 it got an even or odd number of contacts when you press the switch. Please build the following circuit: Tie them all high or low. A common way to do this is with cross-connected NAND gates.

74HC109 DIP-16 J/K flip-flop

Just pull it down to 0V 74hcc109 a single resistor! Never leave it unconnected, even if the circuit appears to work. Sign up using Email and Password. Post as a guest Name.

(PDF) 74HC109 Datasheet download

I’m a complete amateur, I’ve probably gotten a million things wrong with this already. You are clocking a flip-flop directly from a switch that has not been de-bounced. WhatRoughBeast 49k 2 28 Email Required, but never shown. In this case, a ohm resistor, combined with the LED voltage and the limited high output drive of the flip-flop will give you about 6 or 7 mA LED current when on. On the one hand, it will try to draw too much current in the on state, and will also clamp the output to a low voltage which the input will not recognize as high.


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74HC Datasheet, PDF – Alldatasheet

Leaving unused pins floating particularly with CMOS can produce amazingly intermittent, bizarre and maddening errors. Always connect the GND pin. There are exceptions, with some circuits incorporating a built-in pull-up or pull-down resistor, but unless the data sheet mentions these, assume they don’t exist.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. For more complex circuits using counters or state machines you can get the most amazing errors. 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. Maximum Low-Level input voltage with my Vcc at 5V is about datashet.

Connect the cap directly to the sockets nearest the IC power and ground pins. LED does not light up, I’ve done something wrong again haven’t I? I’m trying to toggle the led forgot to add a resistor in the diagram, ah, also forgot to add a line from 5V to Vcc.

Don’t even think about it.