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. µA. VCC = MAX, VIN = V. IIH. In ut HIGH Current. mA. VCC = MAX, VIN = V. IIL. Input LOW Current. – mA. VCC = MAX, VIN = V. IOS. 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.

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Because of this the chip can be used for high speed AND operations.

The description for each pin is given below. TL — Programmable Reference Voltage. After verifying the three states, you can tell that we have satisfied the above truth table. 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. With that the drop datsheet resistor R1 will be zero.

Datasheet – 74LS08

The two inputs of AND gate are driven out from bases of the two transistors. At this time the total VCC appears across resistor R1. Because output vatasheet nothing but voltage across resistor R1 it will be LOW. The chip is used in systems where high speed AND operation is needed.


When both buttons are pressed. The chip is available in different packages and is chosen depending on requirement.

74LS08 datasheet

Not more than one output should be shorted at a time, nor for more than 1 second. Because total VCC appears across transistors the drop across resistor R1 will be zero. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur.

The four AND gates in the chip mentioned earlier are connected internally as shown in diagram below. When any one of the buttons is pressed. In the circuit two transistors are connected in series to form a AND gate.

Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part.


Both transistors will be ON and voltage across both of them will be zero.


There are four AND gates in the chip, we can use one or all gates simultaneously. The chip provides TTL adtasheet which are needed in some systems. Submitted by admin on 6 April A few mentioned below. Output of the AND gate is the voltage across resistor R1. It is really popular and is available everywhere.

SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, dattasheet or incidental damages.

These two inputs are connected to buttons to change the logic of inputs. In this state the current flow through base of both transistors will be zero. For better understanding the internal working let dxtasheet consider the simplified internal circuit of AND gate as shown below.

When both datqsheet are not pressed. This LED is connected to detect the state of output. The chip is basically used where AND logic operation is needed.

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