MM74HC221AN

Product Overview

• Category: Integrated Circuit
• Use: Digital Logic Gate
• Characteristics: Dual Monostable Multivibrator
• Package: DIP (Dual In-line Package)
• Essence: High-Speed CMOS Logic
• Packaging/Quantity: Tube/25 pieces

Specifications

• Supply Voltage: 2V to 6V
• Logic Family: HC
• Number of Pins: 16
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 13 ns (typical)
• Output Current: ±25 mA
• Input Capacitance: 3.5 pF (typical)

Detailed Pin Configuration

1. CLR1: Clear Input for First Monostable
2. A: Trigger Input for First Monostable
3. B: Threshold Input for First Monostable
4. GND: Ground
5. VCC: Supply Voltage
6. Q1: Output of First Monostable
7. Q2: Output of Second Monostable
8. B: Threshold Input for Second Monostable
9. A: Trigger Input for Second Monostable
10. CLR2: Clear Input for Second Monostable
11. RCext: External Resistor/Capacitor Connection for Timing
12. RCext: External Resistor/Capacitor Connection for Timing
13. RCext: External Resistor/Capacitor Connection for Timing
14. RCext: External Resistor/Capacitor Connection for Timing
15. RCext: External Resistor/Capacitor Connection for Timing
16. VCC: Supply Voltage

Functional Features

• Dual monostable multivibrator with independent control inputs
• Each monostable can be triggered and cleared separately
• Monostables can operate in retriggerable or non-retriggerable mode
• Wide operating voltage range allows for versatile applications
• High-speed operation suitable for time-critical applications

Advantages and Disadvantages

Advantages

• Dual monostable design provides flexibility in timing applications
• Independent control inputs allow for precise triggering and clearing
• Wide operating voltage range enables compatibility with various systems
• High-speed operation ensures quick response times

Disadvantages

• Limited number of timing options compared to more complex devices
• Requires external resistors/capacitors for precise timing control
• Not suitable for applications requiring multiple timing functions simultaneously

Working Principles

The MM74HC221AN is a dual monostable multivibrator integrated circuit. It consists of two independent monostable circuits, each capable of generating a pulse of a specific duration upon receiving a trigger signal. The duration of the output pulse is determined by the external resistor and capacitor connected to the RCext pins.

The monostables can operate in either retriggerable or non-retriggerable mode. In retriggerable mode, if a new trigger signal is received before the previous pulse has completed, the output pulse will be extended. In non-retriggerable mode, subsequent trigger signals are ignored until the current pulse has finished.

Detailed Application Field Plans

The MM74HC221AN finds applications in various fields where precise timing control is required. Some potential application areas include:

1. Timing circuits in digital systems
2. Pulse width modulation (PWM) generation
3. Frequency division and counting circuits
4. Delay circuits for synchronization purposes
5. Precision timing in communication systems

Detailed and Complete Alternative Models

1. CD74HC221E: Similar dual monostable multivibrator IC from Texas Instruments
2. MC74HC221N: Dual monostable multivibrator IC from ON Semiconductor
3. SN74HC221N: Dual monostable multivibrator IC from Texas Instruments

These alternative models offer similar functionality and can be used as substitutes for the MM74HC221AN in various applications.

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