SN74221N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Multivibrator
• Characteristics: Dual monostable multivibrator with Schmitt-trigger inputs
• Package: DIP-16 (Dual In-line Package with 16 pins)
• Essence: Provides timing and pulse generation functionality
• Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier

Specifications

• Supply Voltage Range: 4.75V to 5.25V
• Operating Temperature Range: -55°C to +125°C
• Trigger Voltage Levels: VIL = 0.8V, VIH = 2V
• Output Voltage Levels: VOL = 0.5V, VOH = 4.5V
• Propagation Delay Time: 60ns (typical)

Detailed Pin Configuration

1. CLR (Clear) - Active low input for resetting the multivibrator
2. A (Trigger) - Input for triggering the multivibrator
3. B (Trigger) - Input for triggering the multivibrator
4. Rext (External Resistor) - Connects an external resistor to control the timing of the multivibrator
5. Cext (External Capacitor) - Connects an external capacitor to control the timing of the multivibrator
6. Q1 (Output) - Output of the first monostable multivibrator
7. Q1 (Complementary Output) - Complementary output of the first monostable multivibrator
8. GND (Ground) - Ground reference for the IC
9. Q2 (Output) - Output of the second monostable multivibrator
10. Q2 (Complementary Output) - Complementary output of the second monostable multivibrator
11. VCC (Supply Voltage) - Positive supply voltage for the IC
12. Q1 (Complementary Output) - Complementary output of the first monostable multivibrator
13. Q1 (Output) - Output of the first monostable multivibrator
14. Cext (External Capacitor) - Connects an external capacitor to control the timing of the multivibrator
15. Rext (External Resistor) - Connects an external resistor to control the timing of the multivibrator
16. CLR (Clear) - Active low input for resetting the multivibrator

Functional Features

• Dual monostable multivibrator with independent trigger inputs
• Schmitt-trigger inputs for improved noise immunity
• Adjustable timing using external resistor and capacitor
• Outputs provide both normal and complementary waveforms
• Clear input for resetting the multivibrator

Advantages and Disadvantages

Advantages

• Versatile timing and pulse generation capabilities
• Improved noise immunity due to Schmitt-trigger inputs
• Dual monostable design allows for independent triggering
• Wide operating temperature range (-55°C to +125°C)
• Compact DIP-16 package for easy integration

Disadvantages

• Limited supply voltage range (4.75V to 5.25V)
• Propagation delay time may not be suitable for high-speed applications

Working Principles

The SN74221N is a dual monostable multivibrator that generates a pulse of a specific duration in response to a trigger input. It utilizes internal circuitry to control the timing of the pulse based on the values of the external resistor and capacitor connected to the Rext and Cext pins, respectively. The Schmitt-trigger inputs ensure reliable triggering even in the presence of noise or signal fluctuations. The outputs provide both the normal and complementary waveforms of the generated pulse.

Detailed Application Field Plans

The SN74221N can be used in various applications that require precise timing and pulse generation. Some potential application fields include:

1. Timing circuits in digital systems
2. Pulse width modulation (PWM) generation
3. Frequency division and counting circuits
4. Delay circuits for signal synchronization
5. Sequential logic circuitry

Detailed and Complete Alternative Models

• CD4528: Dual monostable multivibrator with similar functionality
• NE555: Timer IC with versatile timing capabilities
• MC14538B: Dual retriggerable/resettable monostable multivibrator

(Note: This is not an exhaustive list, and there are several other alternative models available in the market.)

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