SN74AHC123ADG4

Product Overview

• Category: Integrated Circuit
• Use: Multivibrator and Monostable Multivibrator
• Characteristics: High-speed, Low-power, Schmitt-trigger inputs
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Dual retriggerable monostable multivibrator
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 2 V to 5.5 V
• Input Voltage Range: 0 V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 7 ns (typical)
• Output Current: ±8 mA
• Trigger and Reset Time: 10 ns (typical)

Detailed Pin Configuration

The SN74AHC123ADG4 has a total of 16 pins. The pin configuration is as follows:

1. CLR (Clear) - Active LOW clear input
2. A - Data input A
3. B - Data input B
4. RCext (External resistor-capacitor timing components)
5. Rext (External resistor for RCext)
6. Cext (External capacitor for RCext)
7. GND (Ground)
8. Q - Output Q
9. Q̅ - Complementary output Q̅
10. VCC (Positive power supply)
11. Rext (External resistor for internal timing components)
12. Cext (External capacitor for internal timing components)
13. Rext (External resistor for internal timing components)
14. Cext (External capacitor for internal timing components)
15. Q̅ - Complementary output Q̅
16. Q - Output Q

Functional Features

• Retriggerable operation allows multiple pulses on the outputs without external timing components.
• Schmitt-trigger inputs provide hysteresis for improved noise immunity.
• Monostable operation with an external resistor and capacitor or with internal timing components.

Advantages and Disadvantages

Advantages: - High-speed operation allows for quick response times. - Low-power consumption makes it suitable for battery-powered devices. - Schmitt-trigger inputs provide excellent noise immunity.

Disadvantages: - Limited output current may not be suitable for driving heavy loads. - External timing components are required for precise timing control.

Working Principles

The SN74AHC123ADG4 is a dual retriggerable monostable multivibrator. It can be triggered by either a positive or negative edge on the CLR (Clear) input. Once triggered, the output Q goes high for a duration determined by the timing components connected to the RCext pins. The output remains high until a trigger pulse is applied to the A or B inputs, which restarts the timing cycle.

Detailed Application Field Plans

The SN74AHC123ADG4 is commonly used in various applications, including:

1. Pulse Width Modulation (PWM) generation
2. Frequency division and multiplication circuits
3. Timing and delay circuits
4. Debouncing switches and buttons
5. Oscillator circuits

Detailed and Complete Alternative Models

1. CD74HC123E - Dual retriggerable monostable multivibrator with similar specifications and pin configuration.
2. MC74HC123AN - Dual retriggerable monostable multivibrator with higher operating temperature range.

These alternative models can be used as substitutes for the SN74AHC123ADG4 depending on specific requirements and availability.

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