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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Datasheet – 74LS08
When any one of the buttons is pressed. The circuit working can be explained in few stages below: Submitted by admin on 6 April The chip is used in systems where high speed AND operation is needed. Output of the AND gate is the voltage across resistor R1. The chip is basically used where AND logic operation is needed.
Because output is nothing but voltage across resistor R1 it will be LOW. It is really popular and is available everywhere. When both buttons are pressed.
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 datasgeet or death may occur. For better understanding the internal working let us consider the simplified internal circuit of AND gate as shown below.
Both transistors will be ON and voltage across both of them will xatasheet zero. The description for each pin is given below. These two inputs are connected to buttons to change the logic of inputs.
74LS08 Pinout, Configuration, Equivalents, Circuit & Datasheet
Because total VCC appears across transistors the drop across resistor R1 will be zero. When both buttons are not pressed. The four AND gates in the chip mentioned earlier are connected internally as shown in diagram below.
eatasheet After verifying the three states, you can tell that we have satisfied the above truth table. In this state the current flow through base of both transistors will be zero.
The chip is available in different packages and is chosen depending on requirement. SCILLC makes no 74lx08, 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, consequential or incidental damages.
Not more than one output should be shorted at a time, nor for more than 1 second. There are four AND gates in the chip, datasjeet can use one or all gates simultaneously. Because of this the chip can be used for high speed AND operations.
A few mentioned below. The chip provides TTL outputs which are needed in some systems. 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.
With that the drop across resistor R1 will be zero. TL — Programmable Reference Voltage. This LED is connected to detect the state of output. The two inputs of AND gate are driven out from bases of the two transistors.
74LS08 Datasheet, PDF – Alldatasheet
In the circuit two transistors are connected in series to form a AND gate. At this time the total VCC appears across resistor R1. For realizing the above truth table let us take a simple AND gate application circuit as shown below.