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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Email Required, but never shown. In the circuit two transistors are connected in series to form a AND gate. Both transistors will be ON and voltage across both of them will 47ls08 zero.

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After verifying the three states, you can tell that we have satisfied the above truth table. I am new to electrical engineering still so forgive me if I am making a stupid mistake. Sara Heart 1 6. The chip is used in systems where high speed AND operation is needed.

Then if your IC is good your switches are mis-wired, Annd have done it myself with that type of switch.

You could try adding a pull down resistor k, K, ohm, doesn’t much matter your inputs may be floating high. These two inputs are connected to buttons to change the logic of inputs. There are four legs connected together in pair of two. I think that you were dead on in the first place with your answer SaraHeart. Post as a guest Name. Pull down resistors as suggested in another answermight also a good idea. The description for each pin is given below.


You might be using push buttons that are connected in such a way that the legs are shorted connected together. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

74LS08 – Quad 2-In AND Gate

Something similar should be done to the right button. With that the drop across resistor R1 will be zero. The chip is available in different packages and is chosen depending on requirement. Output of the AND gate is the voltage across resistor R1.

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Simon Marcoux 1, 2 Submitted by admin on 6 April When any one of the buttons is pressed. It is really popular and is available everywhere. When both buttons are not pressed. As you can see the LED is on by default despite neither button being pressed. Pressing the buttons does nothing. Sign up using Facebook. The circuit working can be explained in few stages below: For realizing the above truth table let us take a simple AND gate application circuit as shown below.


It is currently powered by a 5v 1. They are notorious for that particular mishap.

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Because of this the chip can be used for high speed AND operations. The inputs with both switches unpressed allow the pins to float around, depending on the way the IC is set-up internally.

The inputs on CMOS parts anything with a “C” in the middle source or sink very little current, anx K pull-up or -down will work with them. 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.

74LS08 Pinout, Configuration, Equivalents, Circuit & Datasheet

When both buttons are pressed. Home Questions Tags Users Unanswered. The switch between the input pin and Ground will provide a Zero Ohm connection to Ground when the switch is pressed, ensuring that the gate sees the input as a 74la08. At this time the total VCC appears across resistor R1.

Because output is nothing but voltage across resistor R1 it will be LOW. Many pins left floating. As AlmostDone said, you need to draw about 1. Looking at the image I agree.