Encyclopedia Entry: 74AHC123AD-Q100J

Product Information Overview

• Category: Integrated Circuit (IC)
• Use: Multivibrator and Timer Applications
• Characteristics: High-Speed, Low-Power, Monostable/Astable Operation
• Package: SOIC-16
• Essence: Dual Retriggerable Monostable Multivibrator
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2 V to 6 V
• Operating Temperature Range: -40°C to +125°C
• Propagation Delay Time: 10 ns at 4.5 V
• Output Current: ±8 mA
• Input Capacitance: 3.5 pF
• Output Capacitance: 6 pF
• Power Dissipation: 500 mW

Detailed Pin Configuration

The 74AHC123AD-Q100J IC has a total of 16 pins arranged as follows:

___________ Q1 --| |-- VCC /Q1 --| |-- MR /Q2 --| |-- TR Q2 --| |-- RCext GND --| |-- Cext /CLR --| |-- A /DIN --| |-- B /CLK --| |-- C /GND --| |-- D /TRI --| |-- E /RBI --| |-- F /RO --| |-- G /Q --| |-- H /Q --| |-- /OE |___________|

Functional Features

• Dual retriggerable monostable multivibrator
• Can be used as a precision timer or pulse generator
• Monostable operation: Generates a single output pulse of a specified duration upon receiving a trigger signal
• Astable operation: Generates continuous pulses with a fixed frequency and duty cycle
• Retriggerable: Triggering the IC during the output pulse extends the pulse width

Advantages and Disadvantages

Advantages: - High-speed operation allows for precise timing applications - Low-power consumption makes it suitable for battery-powered devices - Retriggerable feature provides flexibility in pulse generation - Wide supply voltage range enables compatibility with various systems

Disadvantages: - Limited output current may restrict its use in high-power applications - Input and output capacitance can affect signal integrity in certain scenarios - Temperature limitations may require additional cooling measures in extreme environments

Working Principles

The 74AHC123AD-Q100J is based on retriggerable monostable multivibrator circuitry. In monostable mode, the IC generates a single output pulse when triggered by an external signal. The pulse width is determined by the values of external resistors and capacitors connected to the RCext and Cext pins.

In astable mode, the IC continuously generates pulses with a fixed frequency and duty cycle. The timing components connected to the RCext and Cext pins determine the pulse width and frequency.

The retriggerable feature allows the IC to extend the output pulse width if triggered again during the active pulse period. This provides flexibility in generating variable-width pulses.

Detailed Application Field Plans

The 74AHC123AD-Q100J finds applications in various fields, including:

1. Precision Timing: Used as a timer in applications requiring accurate pulse generation, such as clock synchronization, time measurement, and event sequencing.
2. Digital Systems: Employed in digital circuits for generating control signals, synchronization pulses, and clock signals.
3. Communication Systems: Utilized in communication devices for pulse shaping, modulation, demodulation, and synchronization purposes.
4. Industrial Automation: Integrated into automation systems for controlling timing sequences, motor drives, and sensor interfacing.
5. Consumer Electronics: Incorporated in consumer electronic devices like remote controls, timers, and digital displays.

Detailed and Complete Alternative Models

Some alternative models to the 74AHC123AD-Q100J IC include:

1. CD74AC123: Similar dual retriggerable monostable multivibrator with a wider supply voltage range.
2. MC14538B: Dual precision monostable multivibrator with additional Schmitt-trigger inputs.
3. SN74LS123: Dual retriggerable monostable multivibrator with TTL logic levels compatibility.

These alternatives offer similar functionality and can be considered based on specific application requirements.

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