74HCT123DB,112

Product Overview

• Category: Integrated Circuit (IC)
• Use: Multivibrator
• Characteristics: High-speed operation, low power consumption
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Dual retriggerable monostable multivibrator
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2.0V to 6.0V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +125°C
• Propagation Delay Time: 22 ns (typical)
• Trigger Pulse Width: 30 ns (minimum)

Detailed Pin Configuration

The 74HCT123DB,112 IC has a total of 16 pins. The pin configuration is as follows:

1. CLR (Clear) - Active LOW input for resetting the multivibrator
2. A (Trigger) - Active HIGH input for triggering the multivibrator
3. B (Retrigger) - Active HIGH input for retriggering the multivibrator
4. REXT (External Resistor) - Connects an external resistor to control the timing characteristics
5. CEXT (External Capacitor) - Connects an external capacitor to control the timing characteristics
6. Q (Output) - Output of the multivibrator
7. GND (Ground) - Ground reference for the IC
8. VCC (Supply Voltage) - Positive supply voltage for the IC
9. NC (No Connection) - No internal connection
10. NC (No Connection) - No internal connection
11. NC (No Connection) - No internal connection
12. NC (No Connection) - No internal connection
13. NC (No Connection) - No internal connection
14. NC (No Connection) - No internal connection
15. NC (No Connection) - No internal connection
16. NC (No Connection) - No internal connection

Functional Features

• Dual retriggerable monostable multivibrator
• Can be triggered by a positive or negative edge
• Retriggerable during the output pulse width period
• Output pulse width can be adjusted using external resistor and capacitor
• High-speed operation allows for precise timing applications
• Low power consumption makes it suitable for battery-powered devices

Advantages and Disadvantages

Advantages: - Dual monostable multivibrator in a single IC package - Retriggerable feature provides flexibility in timing applications - Wide supply voltage range allows for compatibility with various systems - High-speed operation enables accurate timing control - Low power consumption extends battery life in portable devices

Disadvantages: - Limited number of available pins for additional functionality - External resistor and capacitor required for precise timing adjustment - Not suitable for applications requiring continuous oscillation

Working Principles

The 74HCT123DB,112 is a dual retriggerable monostable multivibrator. It generates a single output pulse of a specific width when triggered by an input signal. The output pulse width can be adjusted by connecting an external resistor and capacitor to the appropriate pins.

Upon receiving a trigger signal, the multivibrator output transitions to a high state for a duration determined by the external components. During this time, if a retrigger signal is received, the output pulse width is extended, effectively restarting the timing cycle.

The multivibrator can be triggered by either a positive or negative edge, providing flexibility in different applications. The device operates at high speed, allowing for precise timing control in various electronic systems.

Detailed Application Field Plans

The 74HCT123DB,112 is commonly used in applications that require precise timing control, such as:

1. Pulse Width Modulation (PWM) circuits
2. Timing and delay circuits
3. Frequency division circuits
4. Precision timing for microcontrollers and digital systems
5. Sequential logic circuits

Detailed and Complete Alternative Models

• 74HC123D,652
• CD74HCT123E
• SN74HCT123N
• MC74HCT123AN
• HEF4528BP

These alternative models offer similar functionality and can be used as replacements for the 74HCT123DB,112 in various applications.

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