7402 Quad 2-Input NOR Gate IC Technical Summary

Overview

The 7402 is a quad 2-input NOR gate integrated circuit belonging to the 7400 series of transistor-transistor logic (TTL) chips. This device contains four independent NOR gates, each performing the Boolean logic NOR function. The 7402 is widely used in digital logic circuits where NOR operations are required, offering reliable performance and compatibility with other TTL family components.

As a fundamental building block in digital electronics, the 7402 implements the logical NOR operation where the output is HIGH only when all inputs are LOW. The chip operates with standard TTL power supply voltages and provides robust output drive capability.

Features

• Quad 2-input NOR gates in single package
• Standard TTL switching voltages
• Fully compatible with all 7400 series TTL devices
• Typical propagation delay of 9ns
• Low power consumption (typical 10mW per gate)
• Wide operating temperature range: 0°C to +70°C
• Output can drive up to 10 standard TTL loads
• Available in multiple package options including PDIP, SOIC, and TSSOP
• Input clamping diodes for transient protection

Applications

The 7402 NOR gate finds application in numerous digital logic scenarios including:

• General purpose logic circuits
• Arithmetic logic units (ALUs)
• Memory address decoding
• Clock distribution networks
• Waveform generation
• State machine implementation
• Data processing systems
• Control systems
• Interface logic between different logic families
• Error detection circuits

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.5V to +7V
• DC Input Voltage (V_I): -0.5V to V_CC + 0.5V
• DC Output Voltage (V_O): -0.5V to V_CC + 0.5V
• DC Input Diode Current (I_IK): ±20mA
• DC Output Diode Current (I_OK): ±20mA
• DC Output Current (I_O): ±25mA
• DC Supply Current per Output (I_CCH/I_CCL): ±50mA
• Operating Temperature Range: 0°C to +70°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): +4.75V to +5.25V
• High-Level Input Voltage (V_IH): 2V min
• Low-Level Input Voltage (V_IL): 0.8V max
• Operating Ambient Temperature: 0°C to +70°C

DC Characteristics

• High-Level Output Voltage (V_OH): 2.7V min (V_CC = min, I_OH = -400µA)
• Low-Level Output Voltage (V_OL): 0.4V max (V_CC = min, I_OL = 16mA)
• High-Level Input Current (I_IH): 40µA max (V_CC = max, V_IH = 2.7V)
• Low-Level Input Current (I_IL): -1.6mA max (V_CC = max, V_IL = 0.4V)
• Supply Current (I_CC): 8mA max (all gates switching, V_CC = max)

AC Characteristics

• Propagation Delay (t_PLH, t_PHL): 15ns max (C_L = 15pF, R_L = 400Ω)
• Output Transition Time (t_TLH, t_THL): 15ns max (C_L = 15pF, R_L = 400Ω)
• Input Capacitance: 3pF typ
• Power Dissipation Capacitance: 20pF typ

Package Information

The 7402 is available in several industry-standard packages:

14-Pin Plastic Dual In-Line Package (PDIP)

• Package Code: N
• Body Dimensions: 19.3mm x 6.35mm
• Lead Pitch: 2.54mm
• Lead Count: 14
• Operating Temperature: 0°C to +70°C

14-Pin Small Outline Integrated Circuit (SOIC)

• Package Code: D
• Body Dimensions: 8.65mm x 3.9mm
• Lead Pitch: 1.27mm
• Lead Count: 14
• Operating Temperature: 0°C to +70°C

14-Pin Thin Shrink Small Outline Package (TSSOP)

• Package Code: PW
• Body Dimensions: 5mm x 4.4mm
• Lead Pitch: 0.65mm
• Lead Count: 14
• Operating Temperature: -40°C to +85°C

Pin Configuration

The 7402 features the following pinout configuration:

• Pin 1: 1Y (Output of Gate 1)
• Pin 2: 1A (Input A of Gate 1)
• Pin 3: 1B (Input B of Gate 1)
• Pin 4: 2Y (Output of Gate 2)
• Pin 5: 2A (Input A of Gate 2)
• Pin 6: 2B (Input B of Gate 2)
• Pin 7: GND (Ground)
• Pin 8: 3A (Input A of Gate 3)
• Pin 9: 3B (Input B of Gate 3)
• Pin 10: 3Y (Output of Gate 3)
• Pin 11: 4A (Input A of Gate 4)
• Pin 12: 4B (Input B of Gate 4)
• Pin 13: 4Y (Output of Gate 4)