Encyclopedia Entry: 74AHC123AD,118

Product Overview

Category

The 74AHC123AD,118 belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronics for various applications such as timing and pulse generation.

Characteristics

• High-speed operation
• Low power consumption
• Wide operating voltage range
• Compatibility with TTL and CMOS logic levels

Package

The 74AHC123AD,118 is available in a small outline package (SO) with 16 pins.

Essence

The essence of this product lies in its ability to provide precise timing control and pulse generation in digital circuits.

Packaging/Quantity

The 74AHC123AD,118 is typically packaged in reels or tubes, with a quantity of 2500 units per reel/tube.

Specifications

• Supply Voltage Range: 2 V to 5.5 V
• High-Level Input Voltage: 0.7 x VCC
• Low-Level Input Voltage: 0.3 x VCC
• High-Level Output Voltage: 0.9 x VCC
• Low-Level Output Voltage: 0.1 x VCC
• Maximum Operating Frequency: 125 MHz
• Propagation Delay Time: 6 ns

Detailed Pin Configuration

The 74AHC123AD,118 has 16 pins, which are labeled as follows:

1. CLR (Clear)
2. A (Input A)
3. B (Input B)
4. GND (Ground)
5. RCext (External Resistor/Capacitor)
6. Q (Output Q)
7. Q̅ (Complementary Output Q)
8. VCC (Supply Voltage)
9. NC (No Connection)
10. NC (No Connection)
11. NC (No Connection)
12. NC (No Connection)
13. NC (No Connection)
14. NC (No Connection)
15. NC (No Connection)
16. NC (No Connection)

Functional Features

The 74AHC123AD,118 is a dual retriggerable monostable multivibrator with reset. It features the following functional characteristics:

• Retriggerable operation allows for extending the output pulse width.
• Clear input (CLR) resets the output and prepares the IC for a new trigger event.
• The external resistor and capacitor (RCext) determine the timing characteristics of the output pulse.

Advantages and Disadvantages

Advantages

• High-speed operation enables efficient timing control in digital circuits.
• Low power consumption makes it suitable for battery-powered devices.
• Wide operating voltage range provides flexibility in various applications.
• Compatibility with TTL and CMOS logic levels ensures easy integration into existing systems.

Disadvantages

• Limited maximum operating frequency may restrict its use in high-frequency applications.
• Propagation delay time of 6 ns may introduce timing inaccuracies in certain scenarios.

Working Principles

The 74AHC123AD,118 operates based on the principles of retriggerable monostable multivibrators. When triggered, it generates an output pulse whose duration is determined by the external resistor and capacitor connected to the RCext pin. The output pulse can be extended by retriggering the IC before the pulse ends. The clear input (CLR) resets the output and prepares the IC for a new trigger event.

Detailed Application Field Plans

The 74AHC123AD,118 finds applications in various fields, including:

1. Timing circuits: Used to generate precise time delays in digital systems.
2. Pulse generation: Enables the creation of accurate pulses for triggering other components.
3. Communication systems: Provides timing control in data transmission and reception processes.
4. Industrial automation: Used for timing and synchronization in control systems.
5. Test and measurement equipment: Enables precise timing and pulse generation in testing devices.

Detailed and Complete Alternative Models

1. 74HC123D,652
2. CD74HC123M96
3. SN74AHC123ADGVR
4. MC74HC123ADR2G
5. HEF4538BP,652

These alternative models offer similar functionality to the 74AHC123AD,118 and can be considered as alternatives based on specific requirements.

In conclusion, the 74AHC123AD,118 is a versatile integrated circuit used for timing and pulse generation in digital electronics. Its high-speed operation, low power consumption, and compatibility with TTL and CMOS logic levels make it suitable for various applications. However, its limited maximum operating frequency and propagation delay time should be taken into consideration when selecting this IC for specific projects.