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Description
74LS02 also know as 7402 is a NOR gate that comes with 4 internal NOR gates. IC 7402 comes up with 14 pins and 2 inputs 4-NOR gates. NOR gate is designed with CMOS technology. In the IC all gates come up with buffered output and it has the ability to provide noise immunity to drive LS-TTL Loads.
SPECIFICATIONS
- The operating voltage for the IC I +4.75 to +5.25. The Supply could be extended to 7V.
- The maximum current can draw from the output of the gate is 8mA.
- The maximum ESD protection range for IC is 3.5KV.
- The typical rise and fall time for IC is about 15ns.
- The IC operating temperature is from 0 to 70 degrees and its storage temperature range is -65 to 150 degrees.
RELIABILITY
- The IC comes up with four internal NOR gates which cost less than making a single NOR gate.
- The single NOR gate can the gate’s output at the same time, instead of using them all.
- The IC can be used to design other gates. A single NOT, AND & OR gate can be designed by using the four gates.
- The chip operates at high speed. The chip is designed with Schottky transistors which minimize the switching delays.
- The IC gives output in TTL states, which makes it workable with other systems.
74LS04 IC APPLICATIONS
- NOR gate can be used as general use of NOR logic.
- In Digital Electronics, Servers and many ALUs also come with a NOR gate.
- NOR gate has wide use in Memory units.
- Networking needs NOR gates for some operations.
74LS02 Pinout:
| PINS | DESCRIPTION | |
|---|---|---|
| 1Y | Pin 1 | Pin 1 is representing the first pin of IC and the first OUTPUT of IC. |
| 1A | Pin 2 | Here Pin 2 is representing the first pin of IC and the second pin of the First NOR gate. Its state will affect the output of the first NOR gate. |
| 1B | Pin 3 | Pin 3 will be the second input of the first NOR gate. |
| 2Y | Pin 4 | Pin 4 will be used as the output of the second NOR gate. |
| 2A | Pin 5 | Pin 5 is an input pin. It is used as the first input of the second NOR gate in the IC. |
| 2B | Pin 6 | Pin 6 is the second input Pin of the Second NOR gate in IC. |
| GND | Pin 7 | Pin 7 will be used as the common ground by all the devices and power supply used with the IC to make the ground common. |
| 3A | Pin 8 | Pin 8 will be used as the First input pin of the third NOR gate in IC 74LS02. |
| 3B | Pin 9 | Pin 9 will be the second input pin of the third NOR gate in IC. |
| 3Y | Pin 10 | Pin 10 will be used as the output pin for the 3rd NOR gate. |
| 4A | Pin 11 | Pin 11 will be used as the first input pin of the last and fourth NOR gate of the IC. |
| 4B | Pin 12 | Pin 12 will be used as the second input pin of the fourth NOR gate in the IC. |
| 4Y | Pin 13 | Pin 13 will be used as the output pin for the final NOR gate of the IC. |
| Vcc | Pin 14 | Pin 14 will be used as a power pin to make the IC functional. |