THE OR GATE

An OR gate is a digital logic gate with two or more inputs and one output that performs logical dis-junction. The output of an OR gate is true when one or more of its inputs are true. If all of an OR gate's input are false,then the output of the OR gate is false.

OR GATE SYMBOL

A truth table shows how a logic circuit's output responds to various combinations of the inputs using logic 1 for true and logic 0 for false.

 
      
    In TTL logic the internal arrangement differs from that incase of CMOS logics. In TTL logic 2- input OR gate IC number is 74LS32. popularly known as 7432. LS stands for low power schottky version.

IC 7432

In this IC pin 1 and 2 are the inputs of first gate where the output is from pin number 3. Again pin number 4 and 5 are the inputs of second gate whose output is in pin 6. Pin 10 and 9 are the inputs of fourth gate whose output is at pn 8. The input of the last gate or fourth gate is pin 13 and 12 and pin 11 is its output. Pin 7 is ground and pin 14 is +vcc supply where again +Vcc supply where again +SVdC is the normal and maximum supply. One thing must be maintain at +SVDC. If the i/p voltage would be more than this it may cause damage to the IC.






For more questions, kindly post your comments below.