7432 Quad 2-Input OR Gate Technical Summary

Overview

The 7432 is a quad 2-input OR gate integrated circuit (IC) belonging to the 7400 series of transistor-transistor logic (TTL) components. This device contains four independent OR gates, each with two inputs and one output. The 7432 is widely used in digital logic circuits for performing logical OR operations, making it a fundamental building block in many electronic systems.

As a standard TTL component, the 7432 operates with a nominal supply voltage of 5V and is compatible with other TTL family devices. The IC is designed for reliable operation in various digital applications, from simple logic circuits to complex computing systems.

Features

• Quad 2-input OR gates in a single package
• Standard TTL switching voltages
• Fully compatible with all TTL families
• Typical propagation delay of 9ns (max 15ns)
• Low power consumption: 10mW typical per gate
• Wide operating temperature range
• Fan-out of 10 (can drive up to 10 TTL inputs)
• Standard 14-pin DIP package and other package options

Applications

The 7432 finds use in numerous digital logic applications including:

• Basic logic circuit design
• Arithmetic logic units (ALUs)
• Data processing systems
• Control systems
• Digital signal processing
• Computer systems
• Industrial automation
• Embedded systems
• Educational electronics projects

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
• Operating Temperature Range: 0°C to +70°C (commercial grade)
• 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 Free-air Temperature: 0°C to 70°C

DC Characteristics

• High-level Output Voltage (V_OH): 2.7V min (I_OH = -400µA)
• Low-level Output Voltage (V_OL): 0.5V max (I_OL = 16mA)
• Input Clamp Voltage (V_IK): -1.5V max (I_IK = -18mA)
• High-level Input Current (I_IH): 40µA max (V_IH = 2.7V)
• Low-level Input Current (I_IL): -1.6mA max (V_IL = 0.4V)
• Supply Current (I_CC): 8mA max (all gates switching)

AC Characteristics

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

Package Information

The 7432 is available in several package options, with the 14-pin dual in-line package (DIP) being the most common:

14-Pin DIP Package Details

• Package Type: PDIP-14 (Plastic Dual In-line Package)
• Dimensions: 19.3mm x 6.35mm x 4.57mm (body)
• Lead Pitch: 2.54mm (100 mil)
• Lead Count: 14
• Material: Molded Plastic
• Operating Temperature: 0°C to 70°C

Pin Configuration

• Pin 1: 1A (Gate 1 Input A)
• Pin 2: 1B (Gate 1 Input B)
• Pin 3: 1Y (Gate 1 Output)
• Pin 4: 2A (Gate 2 Input A)
• Pin 5: 2B (Gate 2 Input B)
• Pin 6: 2Y (Gate 2 Output)
• Pin 7: GND (Ground)
• Pin 8: 3Y (Gate 3 Output)
• Pin 9: 3A (Gate 3 Input A)
• Pin 10: 3B (Gate 3 Input B)
• Pin 11: 4Y (Gate 4 Output)
• Pin 12: 4A (Gate 4 Input A)
• Pin 13: 4B (Gate 4 Input B)
• Pin 14: V_CC (Positive Supply Voltage)

Functional Description

The 7432 implements the logical OR function for each of its four gates. The Boolean expression for each gate is Y = A + B, where Y is the output and A, B are the inputs. The truth table for each gate is as follows:

Truth Table (Per Gate)

• Input A = L, Input B = L → Output Y = L
• Input A = L, Input B = H → Output Y = H
• Input A = H, Input B = L → Output Y = H
• Input A = H, Input B = H → Output Y = H

Where: L = Low level (0V to 0.8V), H = High level (2V to V_CC)

Design Considerations

Power Supply Decoupling

A 0.1µF ceramic capacitor should be placed as close as possible between V_CC and GND pins to minimize noise and ensure stable operation.

Unused Inputs

All unused inputs should be tied to either V_CC or GND through a 1kΩ