MM74C221N

Product Overview

• Category: Integrated Circuit
• Use: Digital Logic Gates
• Characteristics: Dual Monostable Multivibrator
• Package: DIP (Dual In-line Package)
• Essence: The MM74C221N is a dual monostable multivibrator integrated circuit that can be used to generate precise time delays or pulses.
• Packaging/Quantity: Available in tubes of 25 units.

Specifications

• Supply Voltage: 5V
• Operating Temperature Range: -55°C to +125°C
• Propagation Delay Time: 35 ns
• Trigger Pulse Width: 30 ns
• Output Pulse Width: Adjustable from 30 ns to 2.4 seconds
• Trigger Input Voltage: 0.8V (min) to 2.0V (max)
• Output Current: 6 mA (max)

Pin Configuration

The MM74C221N has a total of 16 pins, which are assigned as follows:

1. CLR1 - Clear Input for Timer 1
2. TRIG1 - Trigger Input for Timer 1
3. THR1 - Threshold Input for Timer 1
4. DIS1 - Disable Input for Timer 1
5. GND - Ground
6. OUT1 - Output for Timer 1
7. VCC - Positive Power Supply
8. THR2 - Threshold Input for Timer 2
9. TRIG2 - Trigger Input for Timer 2
10. CLR2 - Clear Input for Timer 2
11. DIS2 - Disable Input for Timer 2
12. OUT2 - Output for Timer 2
13. REXT - External Resistor Connection
14. CEXT - External Capacitor Connection
15. NC - No Connection
16. NC - No Connection

Functional Features

• Dual monostable multivibrator with independent timers
• Precise time delay generation
• Adjustable output pulse width
• Trigger inputs for each timer
• Clear and disable inputs for each timer
• External resistor and capacitor connections for timing control

Advantages and Disadvantages

Advantages

• Dual timer functionality allows for versatile applications
• Precise and adjustable time delay generation
• Easy to use and integrate into digital logic circuits
• Wide operating temperature range (-55°C to +125°C)
• Low propagation delay time (35 ns)

Disadvantages

• Limited output current capacity (6 mA max)
• Requires external resistors and capacitors for timing control

Working Principles

The MM74C221N operates as a dual monostable multivibrator, which means it can generate a single output pulse of a precise duration when triggered. Each timer within the IC can be independently triggered and generates an output pulse whose width is determined by the external resistor and capacitor connected to the respective timing pins.

When a trigger input signal is applied to the corresponding trigger pin, the output of the timer goes high for a duration determined by the values of the external resistor and capacitor. The output remains high until the time period defined by the RC network elapses, after which it returns to its low state.

The clear and disable inputs provide additional control over the timers. The clear input resets the timers, forcing the output to go low immediately. The disable input, when activated, prevents the timers from being triggered.

Detailed Application Field Plans

The MM74C221N finds applications in various fields where precise time delays or pulses are required. Some potential application areas include:

1. Timing circuits in digital systems
2. Pulse shaping and waveform generation
3. Delayed triggering of other devices
4. Sequential logic circuitry
5. Precision timing in communication systems
6. Industrial automation and control systems

Alternative Models

• CD74HC221E
• SN74LS221N
• MC14528BCL

These alternative models offer similar functionality to the MM74C221N and can be used as replacements depending on specific requirements.

In conclusion, the MM74C221N is a dual monostable multivibrator integrated circuit that provides precise time delay generation. With its versatile features and wide range of applications, it offers an effective solution for various digital logic and timing requirements.