الوصف
The 7402 is a 14-pin quad IC containing four independent 2-input positive NOR gates. Key features include a wide operating voltage range, low power consumption (especially for its CMOS variants like the 74HC02), high noise immunity due to buffered outputs, and internal ESD protection. The specific logic family (TTL or CMOS) determines precise characteristics like operating voltage, so consulting the datasheet for your variant is recommended.
Features
- Quad 2-Input NOR Gates: The IC contains four separate, independent NOR gate circuits.
- Wide Operating Voltage: The operating voltage range varies by logic family but can be quite broad, with some variants supporting up to 7V.
- Low Power Consumption: CMOS versions like the 74HC02 are designed for low power dissipation.
- Buffered Outputs: The gates have buffered outputs, which provides high noise immunity and allows them to drive multiple loads.
- Internal ESD Protection: Internal diode clamps protect the inputs from damage caused by electrostatic discharge.
- Logic Families & Variations
- TTL vs. CMOS: The "7402" designation covers variants from different logic families, such as the older 74LS02 (TTL) and the more modern 74HC02 (CMOS).
- Functionality: All variants provide positive logic NOR gate functionality, meaning the output is HIGH (1) only when all inputs are LOW (0).