SN74LS122D

Product Overview

Category

SN74LS122D belongs to the category of integrated circuits (ICs).

Use

It is commonly used as a monostable multivibrator or a one-shot pulse generator.

Characteristics

• Low power Schottky TTL technology
• Wide operating voltage range: 4.75V to 5.25V
• High-speed operation: 16ns typical propagation delay
• Output can source or sink up to 8mA
• Operating temperature range: -40°C to 85°C

Package

SN74LS122D is available in a 14-pin dual in-line package (DIP).

Essence

The essence of SN74LS122D lies in its ability to generate a single output pulse of a specified duration when triggered by an input signal.

Packaging/Quantity

SN74LS122D is typically sold in reels or tubes, with quantities varying depending on the supplier.

Specifications

• Supply voltage: 4.75V to 5.25V
• Input voltage: 0V to Vcc
• Output voltage: 0V to Vcc
• Maximum input current: ±1mA
• Maximum output current: ±8mA
• Power dissipation: 500mW

Detailed Pin Configuration

1. CLR (Clear) - Active low clear input
2. A (Trigger) - Positive edge-triggered input
3. B (Threshold) - Negative edge-triggered input
4. Rext (External Resistor) - Connected to an external resistor for pulse width control
5. Cext (External Capacitor) - Connected to an external capacitor for pulse width control
6. GND (Ground) - Ground reference
7. Q (Output) - Output pulse
8. Vcc (Supply Voltage) - Positive supply voltage
9. NC (No Connection) - No internal connection
10. NC (No Connection) - No internal connection
11. NC (No Connection) - No internal connection
12. NC (No Connection) - No internal connection
13. NC (No Connection) - No internal connection
14. NC (No Connection) - No internal connection

Functional Features

SN74LS122D is designed to provide a stable and accurate output pulse width based on the external resistor and capacitor values. It offers the following functional features:

• Monostable multivibrator operation
• Triggered by positive or negative edge input signals
• Adjustable pulse width using external resistor and capacitor
• Output pulse duration independent of trigger pulse duration
• Active low clear input for resetting the circuit

Advantages and Disadvantages

Advantages

• Low power consumption
• High-speed operation
• Wide operating voltage range
• Easy integration into various electronic circuits
• Accurate and stable pulse width generation

Disadvantages

• Limited output current capability
• Requires external components for pulse width control
• Not suitable for applications requiring precise timing at high frequencies

Working Principles

SN74LS122D operates as a monostable multivibrator, which means it generates a single output pulse when triggered by an input signal. The pulse width is determined by the values of the external resistor and capacitor connected to the Rext and Cext pins. When the trigger input (A) experiences a positive or negative edge transition, the output (Q) produces a pulse with a duration determined by the RC time constant.

Detailed Application Field Plans

SN74LS122D finds applications in various fields where a one-shot pulse generator is required. Some of the detailed application field plans include:

1. Timing circuits in digital systems
2. Delay circuits in communication systems
3. Pulse shaping and synchronization circuits
4. Control signal generation in industrial automation
5. Triggering devices in electronic instrumentation

Detailed and Complete Alternative Models

1. CD74HC123E - High-speed CMOS dual retriggerable monostable multivibrator
2. MC14538B - Dual precision monostable multivibrator
3. 74HC123D - Dual retriggerable monostable multivibrator with reset

These alternative models offer similar functionality to SN74LS122D and can be used as substitutes depending on specific requirements.

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