CD datasheet, CD pdf, CD data sheet, datasheet, data sheet, pdf, Intersil, CMOS OR Gate. CD – Dual 4-In OR Gate. Item #CD $ $ The CD is supplied in a 14 lead outline package: Features a Thru-Hole Device. Data Sheet. Texas Instruments cd Logic Gates are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas Instruments cd Logic.

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It could be better with just one, but i think i am used to this way.

Please continue this conversation there because it may become a long thread: Suppose now that the code is From the truth table, R-0 and S-0 makes no change to the outputs. Or the reset line has a problem. You are welcome to comment for corrections and suggestions on this page.

Anyways thanx for ur time and help What should I do??? Instead, it uses diodes connected as OR gates. How to set the desired code we want and how to change it?

Look at the following PCB layout:. The code to open the lock would be ”.

(PDF) CD4072 Datasheet download

It can have as many ‘wrong’ digits as you like, but up to 4 ‘correct’ digits. There are more simple but less secure circuits. This circuit does not have the chip. The keys can be a push-button with one normal-open contact, connected to the positive VDD of the circuit. At 19 June9: It will require to spend a lot of time to design and test the PCB.


At 15 January At 27 December At 28 July7: I have not test it but it could work. One code could be the numberor thebut the code is wrong! Here is a video from the circuit in operation! Plz help me its Ergent: Simple is nice Kammenos,rather than programming a microcontroller.

At 14 November1: It has the same functionality, it is simpler, but it cannot be used with touch keypads. Those should be connected to the 4 buttons that you want to have the code. After testing this circuit on breadboard, I found that it would not reset after pressing the datahseet key-codes. To be more secure, the keypad should be on another remote PCB. At 2 September So, No, it would not work.

I kept it as simple as possible. Imagine that you sit on your PC desk, you pull the keyboard, the cd40772 is near by, you click the button and the computer boots.

At 23 August Sometimes i should use more than i should, like now that i have separated on the top-right corner for the IC power supplies. If you do, you can edit your previous posts and not need to repost a new comment, if you only want to add something At 27 December Each ‘correct’ key press will SET a flip-flop. Then you will connect the RESET of this new flip flop to the output of the pin 1, that is the reset signal from an error button.


The keypad can have as many keys as you like. Look the video and read the section “The keypad”.

CD 데이터시트(PDF) – Intersil Corporation

Also, one digit cannot be more than once in the security code. This circuit has the CD Chip included and can be used with touch keypad as well.

Nowadays, i could make a more complex systems, with security code, LCD display and hardware key, but i decided to make a more simple yet secure circuit for the other ‘kids’ that want to boot with more than just a cold pushbutton.