SN74LS123N

Product Overview

Category

SN74LS123N belongs to the category of integrated circuits (ICs).

Use

It is commonly used as a dual retriggerable monostable multivibrator.

Characteristics

• Dual retriggerable monostable multivibrator
• Low-power Schottky TTL technology
• Wide operating voltage range: 4.75V to 5.25V
• High-speed operation: 16ns typical propagation delay
• Triggering from leading or trailing edge
• Retriggerable for very long pulses up to 100% duty cycle
• Output pulse width can be varied by an external resistor and capacitor
• Available in DIP (Dual In-line Package) format

Package and Quantity

SN74LS123N is available in a 16-pin DIP package. It is typically sold in packs of 10.

Specifications

• Supply Voltage Range: 4.75V to 5.25V
• Input Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 33MHz
• Maximum Power Dissipation: 500mW

Detailed Pin Configuration

The pin configuration of SN74LS123N is as follows:

__ __ A1 -| 1 16 |- VCC B1 -| 2 15 |- CLR A2 -| 3 14 |- Q1 B2 -| 4 13 |- Q2 REXT -| 5 12 |- GND CEXT -| 6 11 |- TR RC -| 7 10 |- DIS RE -| 8 9 |- C ¯¯ ¯¯

Functional Features

• Retriggerable operation: The SN74LS123N can be retriggered during the output pulse, allowing for very long pulses with a duty cycle of up to 100%.
• Wide operating voltage range: It can operate within a voltage range of 4.75V to 5.25V, making it suitable for various applications.
• High-speed operation: With a typical propagation delay of 16ns, it ensures fast and efficient signal processing.
• Triggering flexibility: The IC can be triggered from either the leading or trailing edge of the input pulse.
• Adjustable output pulse width: The pulse width can be adjusted using an external resistor (REXT) and capacitor (CEXT).

Advantages and Disadvantages

Advantages

• Retriggerable operation allows for flexible pulse generation.
• Wide operating voltage range enables compatibility with different systems.
• High-speed operation ensures quick response times.
• Adjustable output pulse width provides customization options.

Disadvantages

• Limited maximum clock frequency of 33MHz may not be suitable for high-frequency applications.
• Requires external components (resistor and capacitor) for pulse width adjustment.

Working Principles

The SN74LS123N operates as a dual retriggerable monostable multivibrator. It generates a single output pulse of a specified width in response to an input trigger signal. The pulse width can be adjusted using external components.

When triggered, the IC produces an output pulse whose duration is determined by the values of the external resistor and capacitor connected to pins RC and CEXT, respectively. The pulse width can be extended by retriggering the IC before the output pulse ends.

Detailed Application Field Plans

SN74LS123N finds applications in various fields, including:

1. Timing circuits: It is commonly used in timing circuits where precise pulse generation is required.
2. Control systems: The IC can be utilized in control systems to generate accurate timing signals.
3. Communication systems: It finds application in communication systems for pulse shaping and synchronization purposes.
4. Industrial automation: SN74LS123N can be employed in industrial automation systems for controlling various processes.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to SN74LS123N are:

1. CD74HC123E: High-speed CMOS dual retriggerable monostable multivibrator.
2. MC14528B: Dual retriggerable/resettable monostable multivibrator.
3. 74HC123D: Dual retriggerable monostable multivibrator with Schmitt-trigger inputs.

These alternatives provide comparable features and can be considered as substitutes for SN74LS123N in different applications.

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