IC Logic Gate 74LS02N NOR
The 74LS02 (also known as 7402) is a quad 2-input NOR gate IC that contains four individual NOR gates. It is built using CMOS technology and offers buffered outputs, providing noise immunity for driving LS-TTL loads.
Specifications:
Operating Voltage: +4.75V to +5.25V (can extend to 7V).
Maximum Current Draw: 8mA from the output of the gates.
ESD Protection: 3.5kV protection for electrostatic discharge.
Rise/Fall Time: Typically 15ns.
Operating Temperature: 0°C to 70°C.
Storage Temperature: -65°C to 150°C.
Reliability:
Cost-Effective: The IC contains four internal NOR gates, which reduces the cost compared to building individual NOR gates.
Multiple Gate Functionality: The IC can be used to design other gates. For example, a single NOT, AND, and OR gate can be derived using the NOR gates.
High-Speed Operation: Schottky transistors are used to minimize switching delays.
TTL Compatibility: The IC gives output in TTL states, allowing easy integration with other systems.
74LS02 Pinout:
| Pin Number | Pin Name | Description |
|---|---|---|
| Pin 1 | 1Y | Output of the first NOR gate. |
| Pin 2 | 1A | First input of the first NOR gate. |
| Pin 3 | 1B | Second input of the first NOR gate. |
| Pin 4 | 2Y | Output of the second NOR gate. |
| Pin 5 | 2A | First input of the second NOR gate. |
| Pin 6 | 2B | Second input of the second NOR gate. |
| Pin 7 | GND | Ground pin for the IC. |
| Pin 8 | 3A | First input of the third NOR gate. |
| Pin 9 | 3B | Second input of the third NOR gate. |
| Pin 10 | 3Y | Output of the third NOR gate. |
| Pin 11 | 4A | First input of the fourth NOR gate. |
| Pin 12 | 4B | Second input of the fourth NOR gate. |
| Pin 13 | 4Y | Output of the fourth NOR gate. |
| Pin 14 | Vcc | Power supply pin for the IC. |
Applications:
General NOR Logic: Used in digital circuits where NOR logic is required.
Digital Electronics: Common in digital systems, including servers and ALUs (Arithmetic Logic Units).
Memory Units: NOR gates are widely used in memory circuits.
Networking Systems: Utilized for specific operations in networking logic.
The 74LS02 is essential for implementing logical functions in digital systems, providing flexibility and reliability with its high-speed performance and TTL compatibility.