CD74HCT221M

Product Overview

• Category: Integrated Circuit
• Use: Digital Logic Gate
• Characteristics: High-Speed CMOS, Dual Monostable Multivibrator
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Monostable Multivibrator IC
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 2V to 6V
• High-Level Input Voltage: 3.15V (minimum), 6V (maximum)
• Low-Level Input Voltage: 0.8V (maximum)
• Output Voltage: 4.5V (minimum), VCC (maximum)
• Propagation Delay Time: 33ns (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The CD74HCT221M has a total of 16 pins. The pin configuration is as follows:

1. CLR (Clear) - Clear input
2. A - Input A
3. B - Input B
4. GND (Ground) - Ground reference
5. Q - Output Q
6. Q̅ - Complementary output Q̅
7. RCext - External resistor-capacitor timing components
8. VCC - Positive power supply
9. Q̅B - Complementary output Q̅B
10. QB - Output QB
11. Rext - External resistor timing component
12. Cext - External capacitor timing component
13. NC (No Connection) - No electrical connection
14. NC - No electrical connection
15. NC - No electrical connection
16. NC - No electrical connection

Functional Features

• Dual monostable multivibrator with independent triggering
• Schmitt-trigger inputs for improved noise immunity
• Wide operating voltage range
• High-speed operation
• Low power consumption

Advantages and Disadvantages

Advantages: - Independent triggering of each monostable multivibrator - Improved noise immunity due to Schmitt-trigger inputs - Wide operating voltage range allows for versatile applications - High-speed operation enables quick response times - Low power consumption for energy-efficient designs

Disadvantages: - Limited number of available timing options - Not suitable for applications requiring precise timing control - Relatively small package size may limit heat dissipation capabilities

Working Principles

The CD74HCT221M is a dual monostable multivibrator IC. It consists of two independent monostable circuits that can be triggered individually. Each monostable circuit generates an output pulse of a fixed duration when triggered by an input signal.

The triggering of the monostable circuits is controlled by the inputs A and B. The outputs Q and Q̅ produce complementary pulses, with Q being the active high output and Q̅ being the active low output. The timing of the output pulses is determined by external resistor-capacitor (RC) timing components connected to the RCext pin.

Detailed Application Field Plans

The CD74HCT221M is commonly used in various digital logic applications, including:

1. Pulse Width Modulation (PWM) generation
2. Timing and delay circuits
3. Frequency division and counting circuits
4. Data synchronization and signal conditioning
5. Control signal generation in microcontroller-based systems

Detailed and Complete Alternative Models

1. SN74HCT221N: Similar functionality, but in DIP (Dual Inline Package) format
2. MC74HCT221ADR2G: Higher speed operation and wider temperature range
3. CD74HC221E: Compatible with 5V logic levels, suitable for mixed-voltage systems

These alternative models offer similar functionality to the CD74HCT221M and can be used as replacements depending on specific requirements.

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