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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A common way to 74hc10 this is with cross-connected NAND gates. Leaving unused pins floating particularly with CMOS can produce amazingly intermittent, bizarre and maddening errors.

(PDF) 74HC109 Datasheet download

Sometimes that works, and sometimes it doesn’t. 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. I’m a datassheet amateur, I’ve probably gotten a million things wrong with this already.

You are clocking a flip-flop directly from a 74hc190 that has not been de-bounced. Email Required, but never shown.

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. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. In this case, it will show up as intermittent operation of the flip-flop, depending on whether or not it got an even or odd number of contacts when you press the switch.


John Honniball 2, 6 9.

74HC109 Datasheet

WhatRoughBeast 49k 2 28 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. LED does not 7h4c109 up, I’ve done something wrong again haven’t I? Please build the following circuit: Sign up using Email and Password.

LED lights up but does not toggle. Post as a guest Name. 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.

digital logic – Unable to toggle SN74HC – Electrical Engineering Stack Exchange

Sign up or log in Sign up using Google. Tie them all high or low. When 74hc09 circuit is powered, the led turns on but does not toggle when the momentary switch is pressed and released. 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. 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 Just pull it down to 0V with a single resistor!


Maximum Low-Level input voltage with my Vcc at 5V is about 1. Don’t even think about it.

Always connect the GND pin. Never leave it unconnected, even if the circuit appears to work.

dataaheet 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. For more complex circuits using counters or state machines you can get the most amazing errors. 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.

74HC Datasheet, PDF – Alldatasheet

Connect the cap directly to the sockets nearest the IC power and ground pins. 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. You need a de-bouncing circuit to feed the flip-flop’s clock input.

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