SN74LS423D

Product Overview

• Category: Integrated Circuit
• Use: Logic Gates
• Characteristics: Dual Retriggerable Monostable Multivibrator
• Package: DIP (Dual In-line Package)
• Essence: High-speed TTL logic IC
• Packaging/Quantity: Tube, 25 pieces per tube

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: 0°C to 70°C
• Propagation Delay Time: 15ns
• Trigger Pulse Width: 30ns
• Trigger Input Current: ±20mA
• Output Current: ±8mA
• Power Dissipation: 500mW

Detailed Pin Configuration

The SN74LS423D has a total of 16 pins, which are labeled as follows:

1. CLR1 - Clear Input 1
2. A1 - Timing Resistor/Capacitor 1
3. B1 - Timing Resistor/Capacitor 2
4. REXT - External Timing Resistor
5. CEXT - External Timing Capacitor
6. VCC - Positive Power Supply
7. Q1 - Output 1
8. GND - Ground
9. Q2 - Output 2
10. TRIG - Trigger Input
11. THRES - Threshold Input
12. CLR2 - Clear Input 2
13. A2 - Timing Resistor/Capacitor 3
14. B2 - Timing Resistor/Capacitor 4
15. DISCH - Discharge Output
16. VCC - Positive Power Supply

Functional Features

The SN74LS423D is a dual retriggerable monostable multivibrator that can be used to generate precise time delays or pulses. It features two independent monostable circuits, each with its own trigger and reset inputs. The device is designed to operate with a wide range of input pulse widths and can be triggered by either positive or negative edges.

Advantages and Disadvantages

Advantages: - Dual monostable circuits provide flexibility in timing applications - Retriggerable feature allows for extended output pulse durations - Wide operating voltage range ensures compatibility with various systems - High-speed TTL logic enables fast signal processing

Disadvantages: - Limited output current capability may restrict use in certain applications - Requires external timing components for precise delay generation - Not suitable for low-power or battery-operated devices due to relatively high power dissipation

Working Principles

The SN74LS423D operates based on the principles of monostable multivibrators. When triggered, the device generates an output pulse with a duration determined by the external timing resistor and capacitor connected to the appropriate pins. The output pulse width can be extended by retriggering the circuit before the pulse ends. The device resets when the clear inputs are activated or power is cycled.

Detailed Application Field Plans

The SN74LS423D finds applications in various fields where precise timing or pulse generation is required. Some common application areas include:

1. Timing circuits in digital systems
2. Pulse-width modulation (PWM) control
3. Delay circuits in communication systems
4. Precision timing in industrial automation
5. Frequency division in clock generation

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the SN74LS423D are:

1. CD4538 - Dual Precision Monostable Multivibrator
2. MC14538 - Dual Precision Retriggerable/Resettable Monostable Multivibrator
3. 74HC123 - Dual Retriggerable Monostable Multivibrator

These alternatives can be considered based on specific requirements and availability.

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