74LS08 IC is a member of 74XXYY IC series. There are four AND gates in the chip and each gate have two inputs, hence the name. 74LS SN74LS08NSR. ACTIVE. SO. NS. Green (RoHS. & no Sb/Br). CU NIPDAU. LevelC-UNLIM. 0 to 74LS SN74S08D. ACTIVE. Note The ”Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaran- teed The device should not be operated at.

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Submitted by admin on 6 April Many pins left floating.

74LS08 – Quad 2-In AND Gate

They are notorious for that particular mishap. It is currently powered by a 5v 1. If you want to absolutely avoid learning the pin out of these push buttons, always connect them in diagonal. Pull down resistors as suggested in another answermight also a good idea. I am new to electrical engineering still so forgive me if I am making a stupid mistake. This LED is connected to detect the state of output. It is really popular and is available everywhere.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. And after a google search I havnt come up with anything, usually the videos are terrible quality or they are using a different AND gate. The chip provides TTL outputs which are needed in some systems.

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Sara Heart 1 6.

74LS08 – Quad 2-In AND Gate

Post as a guest Name. Because output is nothing but voltage across resistor R1 it will be LOW. In the circuit two transistors are connected anc series to form a AND gate.

With that the drop across resistor R1 will be zero. A few mentioned below.

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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 think that you were dead on in the first place with your answer SaraHeart. In that case, the left button should have a red wire on the lower left pin.

I have tried switching to a 9v battery and nothing changes. Looking at the image I agree. Pressing the buttons does nothing.

74LS08 Quadruple 2 Input Positive AND Gate IC

The four AND gates in the chip mentioned earlier are connected internally as shown in diagram below. Simon Marcoux 1, 2 If you do use a pull down resistor, make it low like PeterBennett recommended. The chip is used in systems where xnd speed AND operation is needed. For better understanding the internal working let us consider the simplified internal circuit of AND gate as shown below.


Home Questions Tags Users Unanswered. The description for each pin is given below. Because of this the chip can be used for high speed AND operations. The chip is basically used where AND logic operation is needed.

When both buttons are pressed. As you can see the LED is on by default despite neither button being pressed. When any one of the buttons is pressed. There are four legs connected together in pair of two. At this time the total VCC appears across resistor R1.

Then if your IC is good your switches are mis-wired, I have done it myself with that type of switch. Output of the AND gate is the voltage across resistor R1.

When both buttons are not pressed. Sign up using Facebook. Something similar should be done to the right button.

TL — Programmable Reference Voltage. Sign up using Email and Password.