CD74HCT123E

Product Overview

• Category: Integrated Circuit
• Use: Multivibrator and Monostable Multivibrator
• Characteristics: High-Speed CMOS Logic, Dual Retriggerable Precision Monostable Multivibrator
• Package: 16-Pin PDIP (Plastic Dual In-Line Package)
• Essence: The CD74HCT123E is a dual retriggerable precision monostable multivibrator that can be used as a multivibrator or a monostable multivibrator.
• Packaging/Quantity: Available in tubes of 25 units or reels of 2,000 units.

Specifications

• Supply Voltage: 2V to 6V
• Propagation Delay Time: 30ns (typical)
• Triggering Inputs: Active-High and Active-Low
• Output Pulse Width: Adjustable from 0.1μs to 100ms
• Operating Temperature Range: -55°C to +125°C

Detailed Pin Configuration

The CD74HCT123E has a total of 16 pins, which are assigned specific functions:

1. CLR1: Clear Input for Multivibrator 1
2. A1: Trigger Input for Multivibrator 1
3. B1: Threshold Input for Multivibrator 1
4. REXT1: External Resistor Connection for Multivibrator 1
5. CEXT1: External Capacitor Connection for Multivibrator 1
6. VCC: Positive Power Supply
7. Q1: Output for Multivibrator 1
8. GND: Ground
9. Q2: Output for Multivibrator 2
10. CLR2: Clear Input for Multivibrator 2
11. A2: Trigger Input for Multivibrator 2
12. B2: Threshold Input for Multivibrator 2
13. REXT2: External Resistor Connection for Multivibrator 2
14. CEXT2: External Capacitor Connection for Multivibrator 2
15. RC: Reset Control Input
16. VCC: Positive Power Supply

Functional Features

• Dual retriggerable precision monostable multivibrator
• Can be used as a multivibrator or a monostable multivibrator
• Active-high and active-low triggering inputs
• Adjustable output pulse width
• High-speed CMOS logic

Advantages and Disadvantages

Advantages

• Dual functionality as a multivibrator or a monostable multivibrator
• Retriggerable operation allows for extended pulse generation
• Wide operating voltage range (2V to 6V)
• Fast propagation delay time for high-speed applications

Disadvantages

• Limited output pulse width adjustment range (0.1μs to 100ms)
• Requires external resistors and capacitors for precise timing control

Working Principles

The CD74HCT123E operates based on the principles of multivibrator and monostable multivibrator circuits. It can be triggered by either an active-high or active-low input signal, which initiates the generation of an output pulse with a user-adjustable width. The retriggerable feature allows for extending the pulse duration if additional trigger signals are received during the pulse period.

Detailed Application Field Plans

The CD74HCT123E finds applications in various fields, including:

1. Timing and synchronization circuits
2. Pulse generation and shaping
3. Frequency division and counting
4. Delay circuits
5. Control systems
6. Communication systems
7. Industrial automation

Detailed and Complete Alternative Models

1. SN74HCT123E: Similar dual retriggerable precision monostable multivibrator from Texas Instruments.
2. MC74HCT123A: Dual retriggerable monostable multivibrator with slightly different specifications from ON Semiconductor.
3. CD74HC123E: Non-retriggerable version of the monostable multivibrator from Texas Instruments.

These alternative models offer similar functionality and can be considered as substitutes for the CD74HCT123E in various applications.

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