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IC Logic Gate 74LS02N NOR

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. 

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NOR Logic Gate
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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 NumberPin NameDescription
Pin 11YOutput of the first NOR gate.
Pin 21AFirst input of the first NOR gate.
Pin 31BSecond input of the first NOR gate.
Pin 42YOutput of the second NOR gate.
Pin 52AFirst input of the second NOR gate.
Pin 62BSecond input of the second NOR gate.
Pin 7GNDGround pin for the IC.
Pin 83AFirst input of the third NOR gate.
Pin 93BSecond input of the third NOR gate.
Pin 103YOutput of the third NOR gate.
Pin 114AFirst input of the fourth NOR gate.
Pin 124BSecond input of the fourth NOR gate.
Pin 134YOutput of the fourth NOR gate.
Pin 14VccPower 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.