SN74LS221N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Dual Monostable Multivibrator
• Characteristics:
  • TTL (Transistor-Transistor Logic) technology
  • Low power consumption
  • High-speed operation
  • Wide operating voltage range
• Package: DIP (Dual In-line Package)
• Essence: Reliable timing control in digital circuits
• Packaging/Quantity: Available in tubes of 25 or reels of 2000 units

Specifications

• Supply Voltage Range: 4.75V to 5.25V
• Operating Temperature Range: 0°C to 70°C
• Propagation Delay Time: 15 ns
• Trigger Pulse Width: 20 ns to 100 ms
• Trigger Voltage Range: 2V to VCC
• Trigger Input Current: -0.4 mA to 1.6 mA
• Output Current: ±8 mA
• Power Dissipation: 500 mW

Detailed Pin Configuration

The SN74LS221N has a total of 16 pins, which are assigned as follows:

1. CLR (Clear)
2. A (Trigger)
3. B (Threshold)
4. REXT (External Resistor)
5. CEXT (External Capacitor)
6. Q (Output)
7. GND (Ground)
8. Q' (Complementary Output)
9. VCC (Positive Power Supply)

Pins 10 to 16 are not used and should be left unconnected.

Functional Features

• Dual monostable multivibrator with independent triggering
• Can generate accurate time delays for various applications
• Stable output pulse width unaffected by trigger pulse duration
• Triggering can be done using positive or negative edge transitions
• Output pulse width can be adjusted using external resistor and capacitor

Advantages and Disadvantages

Advantages: - TTL technology ensures compatibility with a wide range of digital circuits - Low power consumption makes it suitable for battery-powered devices - High-speed operation allows for precise timing control - Wide operating voltage range provides flexibility in different applications

Disadvantages: - Limited output current may restrict its use in certain high-power applications - Propagation delay time may affect the accuracy of timing in critical applications

Working Principles

The SN74LS221N operates as a dual monostable multivibrator. It generates a single output pulse of a fixed duration when triggered by an input signal. The triggering can be done using either positive or negative edge transitions. The output pulse width is determined by an external resistor and capacitor connected to the device.

Detailed Application Field Plans

The SN74LS221N finds applications in various fields, including:

1. Timing Control: Provides accurate time delays in digital systems, such as clock synchronization and data sampling.
2. Pulse Shaping: Used to generate precise output pulses for controlling other circuit elements.
3. Communication Systems: Enables synchronization and timing control in communication protocols.
4. Industrial Automation: Used in timing circuits for controlling processes and equipment.
5. Robotics: Provides timing control signals for coordinating robot movements and actions.

Detailed and Complete Alternative Models

1. CD4047: CMOS-based monostable/astable multivibrator IC.
2. NE555: Popular timer IC with versatile timing functions.
3. MC14538B: Dual retriggerable/resettable monostable multivibrator IC.

These alternative models offer similar functionality and can be used as substitutes for the SN74LS221N in various applications.

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