SN74AHC123ADBR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Multivibrator
• Characteristics: High-speed, Advanced CMOS technology
• Package: SSOP (Shrink Small Outline Package)
• Essence: Dual retriggerable monostable multivibrator
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2 V to 5.5 V
• High-Level Input Voltage: 2 V to VCC + 0.5 V
• Low-Level Input Voltage: -0.5 V to 0.8 V
• High-Level Output Current: -8 mA
• Low-Level Output Current: 8 mA
• Propagation Delay Time: 7 ns
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The SN74AHC123ADBR 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 timing)
6. Cext (External capacitor for timing)
7. GND (Ground)
8. Q - Output Q
9. Q̅ - Complementary output Q̅
10. VCC (Positive power supply voltage)
11. Rext (Internal resistor for timing)
12. CE (Clock enable input)
13. D - Data input D
14. S (Set) - Active HIGH set input
15. R (Reset) - Active HIGH reset input
16. CLK (Clock) - Clock input

Functional Features

The SN74AHC123ADBR is a dual retriggerable monostable multivibrator. It has the following functional features:

• Retriggerable operation allows the output pulse width to be extended by applying a positive pulse to the RExt input during the timing interval.
• The CLR input can be used to override the timing function and force the output into a low state.
• The CE input is used to enable or disable the clock input, allowing for control over the triggering of the multivibrator.
• The S and R inputs provide additional control over the output state.

Advantages and Disadvantages

Advantages: - High-speed operation - Advanced CMOS technology ensures low power consumption - Retriggerable functionality provides flexibility in pulse width generation

Disadvantages: - Limited supply voltage range (2 V to 5.5 V) - Propagation delay time may affect timing accuracy in certain applications

Working Principles

The SN74AHC123ADBR operates as a retriggerable monostable multivibrator. When triggered by a rising edge on the CLK input, the multivibrator generates an output pulse with a duration determined by the external resistor-capacitor timing components. The pulse width can be extended by applying a positive pulse to the RExt input during the timing interval. The CLR input can be used to force the output into a low state, overriding the timing function.

Detailed Application Field Plans

The SN74AHC123ADBR finds applications in various fields, including:

1. Timing circuits: The retriggerable feature makes it suitable for generating precise timing signals in applications such as clocks, timers, and frequency dividers.
2. Pulse width modulation: The ability to extend the pulse width makes it useful in applications like motor speed control and LED dimming.
3. Communication systems: The multivibrator can be utilized in data transmission and reception circuits for synchronization purposes.
4. Industrial automation: It can be employed in control systems for generating precise timing signals in industrial processes.

Detailed and Complete Alternative Models

1. SN74AHC123ADR: Similar to SN74AHC123ADBR, but available in SOIC (Small Outline Integrated Circuit) package.
2. CD74HC123E: Equivalent monostable multivibrator IC from Texas Instruments, available in DIP (Dual Inline Package) format.
3. MC74VHC123ADR2G: Retriggerable monostable multivibrator IC from ON Semiconductor, available in SOIC package.

Note: This is not an exhaustive list of alternative models, and it is recommended to refer to the manufacturer's datasheets for a complete list of alternatives.

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