DM74LS123M

Product Overview

• Category: Integrated Circuit (IC)
• Use: Multivibrator
• Characteristics: Monostable Multivibrator, Dual Retriggerable
• Package: 16-pin SOIC (Small Outline Integrated Circuit)
• Essence: The DM74LS123M is a monostable multivibrator IC that can be used to generate precise time delays or pulses.
• Packaging/Quantity: Available in reels of 2500 units.

Specifications

• Supply Voltage: 4.75V to 5.25V
• High-Level Output Voltage: 2.7V (min)
• Low-Level Output Voltage: 0.5V (max)
• Propagation Delay Time: 15ns (typical)
• Trigger Pulse Width: 35ns (min)
• Reset Pulse Width: 35ns (min)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The DM74LS123M has a total of 16 pins, which are assigned specific functions as follows:

1. Clear (CLR)
2. A Input
3. B Input
4. Ground (GND)
5. B Output
6. A Output
7. Trigger (TR)
8. Reset (RD)
9. VCC (+5V)
10. Control Voltage (CV)
11. External Capacitor (CEX)
12. External Resistor (REX)
13. Threshold (TH)
14. Discharge (DIS)
15. Output (OUT)
16. VCC (+5V)

Functional Features

• Monostable Operation: The DM74LS123M operates as a monostable multivibrator, producing a single output pulse of a fixed duration when triggered.
• Dual Retriggerable: It can be retriggered during the output pulse, allowing for the generation of multiple pulses.
• Precise Timing: The IC provides accurate and stable time delays due to its internal timing components.
• Wide Operating Voltage Range: It can operate within a voltage range of 4.75V to 5.25V, making it suitable for various applications.

Advantages and Disadvantages

Advantages: - Accurate and stable time delay generation - Dual retriggerable feature allows for flexibility in pulse generation - Wide operating voltage range ensures compatibility with different systems

Disadvantages: - Limited functionality compared to more advanced multivibrator ICs - Requires external components (capacitor and resistor) for operation

Working Principles

The DM74LS123M operates based on the principles of monostable multivibrator circuits. When triggered by a positive pulse at the Trigger (TR) pin, the IC generates a single output pulse whose duration is determined by the values of the external capacitor (CEX) and resistor (REX). The output pulse width can be adjusted by varying these external components.

Detailed Application Field Plans

The DM74LS123M finds applications in various fields where precise time delays or pulse generation is required. Some of the common application areas include:

1. Timing Circuits: Used in digital systems to generate precise time delays for synchronization purposes.
2. Pulse Shaping: Employed in communication systems to shape input signals into desired pulse formats.
3. Control Systems: Integrated into control circuits to generate timed events or triggers.
4. Instrumentation: Utilized in test and measurement equipment for generating specific pulse patterns.

Detailed and Complete Alternative Models

1. CD74HC123E: High-speed CMOS version of the monostable multivibrator IC.
2. MC14538B: Dual retriggerable monostable multivibrator IC with wider operating voltage range.
3. NE555: Popular timer IC that can be configured as a monostable multivibrator.

These alternative models offer similar functionality and can be used as substitutes for the DM74LS123M in various applications.

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