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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The four AND gates in datashheet chip mentioned earlier are connected internally as shown in diagram below. The chip is used in systems where high speed AND operation is needed.
The datashewt for each pin is given below. When both buttons are pressed. The chip is basically used where AND logic operation is needed.
For better understanding the internal working let us consider the simplified internal circuit of AND gate as shown below. For realizing the above truth datasheet let us take a simple AND gate application circuit as shown below.
The chip is available in different packages and is chosen depending on requirement.
74LS08 – Quad 2-In AND Gate
Both transistors will be ON and voltage across both of them will be zero. Not more than datahseet output should datasneet shorted at a time, nor for more than 1 second. 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.
These two inputs are connected to buttons to change the logic of inputs. This LED is connected to detect the state of output. In the circuit two transistors datashwet connected in series to form a AND gate.
74LS08 fan-out datasheet & applicatoin notes – Datasheet Archive
Output of the AND gate is the voltage across resistor R1. Submitted by admin on 6 April 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 two inputs of AND gate are driven out from bases of the two transistors. Because output is nothing but voltage across resistor R1 it will be LOW.
It is really popular and is available everywhere. Because total VCC appears across transistors the drop across resistor R1 will be zero. With that the drop across resistor R1 will be zero. The chip provides TTL outputs which are needed in some systems.
A few mentioned below. Because of this the chip can be used for high speed AND operations. The circuit working can be explained in few stages below: When both buttons are not pressed.
After verifying the three states, you can tell that we have satisfied the above truth table. 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 7l4s08 any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
At this time the total VCC appears across resistor R1.
In this state the current flow through base of both transistors will be zero. TL — Programmable Reference Voltage. There are four AND gates in the chip, we can use one or all gates simultaneously. When any one of the buttons is pressed.