CD74HC221NSR

Product Overview

• Category: Integrated Circuit
• Use: Digital Logic Gate
• Characteristics: High-Speed, Dual Monostable Multivibrator
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Reliable and efficient digital logic gate for timing applications
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 2V to 6V
• Logic Family: HC
• Number of Pins: 16
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 9 ns (typical)
• Output Current: ±4 mA
• Input Capacitance: 3.5 pF
• Output Capacitance: 7 pF

Detailed Pin Configuration

1. CLR (Clear) - Active LOW input for resetting the flip-flop
2. A (Input A) - Input for setting the time period
3. B (Input B) - Input for setting the time period
4. REXT (External Resistor) - Connects an external resistor for precise timing control
5. CEXT (External Capacitor) - Connects an external capacitor for precise timing control
6. Q (Output Q) - Output of the flip-flop
7. Q̅ (Complementary Output Q̅) - Complementary output of the flip-flop
8. GND (Ground) - Ground reference for the IC
9. VCC (Positive Power Supply) - Positive power supply for the IC
10. NC (No Connection) - No electrical connection
11. NC (No Connection) - No electrical connection
12. NC (No Connection) - No electrical connection
13. NC (No Connection) - No electrical connection
14. NC (No Connection) - No electrical connection
15. NC (No Connection) - No electrical connection
16. NC (No Connection) - No electrical connection

Functional Features

• Dual monostable multivibrator with independent triggering
• Precise timing control using external resistor and capacitor
• Wide operating voltage range for flexibility
• High-speed operation for time-critical applications
• Low power consumption for energy efficiency
• Complementary outputs for versatile use in various circuits

Advantages and Disadvantages

Advantages

• Reliable and efficient digital logic gate
• Precise timing control for accurate operations
• Dual monostable multivibrator allows independent triggering
• Wide operating voltage range provides flexibility
• High-speed operation suitable for time-critical applications
• Low power consumption for energy efficiency

Disadvantages

• Limited number of pins restricts the complexity of circuits
• External components required for precise timing control

Working Principles

The CD74HC221NSR is a dual monostable multivibrator that generates a pulse of a specific duration when triggered. It consists of two independent monostable circuits, each triggered by separate inputs A and B. The time period of the output pulse is determined by an external resistor (REXT) and capacitor (CEXT) connected to the IC.

When either input A or B goes LOW, the corresponding monostable circuit is triggered, and its output Q goes HIGH for a specific time period determined by the values of REXT and CEXT. The complementary output Q̅ goes LOW during this time. After the specified time period, the output Q returns to LOW, and Q̅ goes HIGH.

The CD74HC221NSR operates on a wide supply voltage range of 2V to 6V, making it suitable for various digital logic applications. It provides precise timing control, allowing users to adjust the time period by selecting appropriate values for REXT and CEXT.

Detailed Application Field Plans

The CD74HC221NSR is commonly used in applications that require precise timing control, such as:

1. Pulse Width Modulation (PWM) circuits
2. Frequency generators
3. Time delay circuits
4. Sequential logic circuits
5. Timing circuits in microcontrollers and microprocessors

Its dual monostable multivibrator configuration and high-speed operation make it suitable for a wide range of digital systems where accurate timing is crucial.

Detailed and Complete Alternative Models

• SN74HC221N
• MC74HC221N
• 74HC221D
• CD74HCT221E
• HEF4528BP

These alternative models offer similar functionality and can be used as substitutes for the CD74HC221NSR in various applications.

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