Encyclopedia Entry: 74HCT123PW,118

Product Overview

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

Specifications

• Supply Voltage Range: 2.0V to 6.0V
• Input Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +125°C
• Output Current: ±4.0mA
• Propagation Delay Time: 22ns at 5V
• Trigger Pulse Width: 23ns at 5V

Detailed Pin Configuration

The 74HCT123PW,118 IC has a total of 16 pins, which are assigned 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. GND (Ground) - Ground reference voltage
5. Q (Output) - Output pin of the multivibrator
6. Q̅ (Complementary Output) - Complementary output pin of the multivibrator
7. RCext (External Resistor-Capacitor) - External resistor-capacitor timing components connection
8. VCC (Supply Voltage) - Positive supply voltage

Pins 9 to 16 are not used in this particular IC.

Functional Features

• Dual retriggerable monostable multivibrator with independent trigger and retrigger inputs
• Capable of generating accurate and stable time delays
• High-speed operation allows for precise timing applications
• Low power consumption makes it suitable for battery-powered devices
• Schmitt-trigger inputs provide hysteresis, ensuring noise immunity

Advantages and Disadvantages

Advantages: - Flexible trigger and retrigger inputs enable versatile timing functions - Wide supply voltage range allows compatibility with various systems - Compact TSSOP package saves board space - High-speed operation ensures accurate timing control

Disadvantages: - Limited output current may restrict certain applications - External resistor-capacitor components required for timing adjustments

Working Principles

The 74HCT123PW,118 is a dual retriggerable monostable multivibrator. It operates by triggering the multivibrator using the A input, which starts a timing cycle. The B input can be used to retrigger the multivibrator, extending the timing cycle. The duration of the timing cycle is determined by the external resistor-capacitor (RC) components connected to the RCext pin. Once triggered or retriggered, the Q output goes high for the specified time period, providing the desired timing function.

Detailed Application Field Plans

The 74HCT123PW,118 IC finds application in various fields, including: 1. Timing circuits in electronic appliances 2. Pulse width modulation (PWM) generation 3. Frequency division and counting circuits 4. Delay circuits in communication systems 5. Control systems requiring precise timing

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the 74HCT123PW,118 IC are: 1. CD74HC123E - Dual Retriggerable Monostable Multivibrator, DIP-16 package 2. SN74HCT123N - Dual Retriggerable Monostable Multivibrator, DIP-16 package 3. MC74HCT123AN - Dual Retriggerable Monostable Multivibrator, DIP-16 package

These alternative models can be considered based on specific requirements and availability.

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