SN74LV221APW

Product Overview

• Category: Integrated Circuit (IC)
• Use: Timer/Counter
• Characteristics:
  • Low-voltage operation
  • Dual monostable multivibrator
  • Schmitt-trigger inputs
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: Reliable and versatile timer/counting functionality
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2 V to 5.5 V
• Operating Temperature Range: -40°C to +85°C
• Input Voltage Range: 0 V to VCC
• Output Voltage Range: 0 V to VCC
• Maximum Clock Frequency: 50 MHz
• Trigger Pulse Width: 20 ns to 100 ms
• Propagation Delay Time: 10 ns

Detailed Pin Configuration

The SN74LV221APW has a total of 16 pins arranged as follows:

1. CLR (Clear) - Active low clear input
2. A (Input A) - First input for trigger pulse width control
3. B (Input B) - Second input for trigger pulse width control
4. GND (Ground) - Ground reference
5. Q (Output Q) - Output of the first monostable multivibrator
6. Q̅ (Output Q̅) - Complementary output of the first monostable multivibrator
7. RCext (External Resistor-Capacitor) - External resistor-capacitor timing components connection
8. VCC (Supply Voltage) - Positive supply voltage
9. Q (Output Q) - Output of the second monostable multivibrator
10. Q̅ (Output Q̅) - Complementary output of the second monostable multivibrator
11. TR (Trigger) - Trigger input
12. Rext (External Resistor) - External resistor timing component connection
13. Cext (External Capacitor) - External capacitor timing component connection
14. GND (Ground) - Ground reference
15. A̅ (Input A̅) - Complementary input for trigger pulse width control
16. B̅ (Input B̅) - Complementary input for trigger pulse width control

Functional Features

• Dual monostable multivibrator with independent trigger inputs
• Schmitt-trigger inputs for improved noise immunity
• Wide supply voltage range allows operation in various systems
• Low power consumption
• High-speed operation up to 50 MHz clock frequency
• Flexible trigger pulse width control using external resistors and capacitors

Advantages

• Versatile timer/counting functionality suitable for a wide range of applications
• Reliable performance due to low-voltage operation
• Improved noise immunity with Schmitt-trigger inputs
• Compact TSSOP package for space-constrained designs
• Easy integration into existing circuits

Disadvantages

• Limited maximum clock frequency compared to some other ICs in the same category
• Requires external timing components for precise pulse width control

Working Principles

The SN74LV221APW is a dual monostable multivibrator IC that generates output pulses of a specific duration based on the trigger inputs and external timing components. The Schmitt-trigger inputs ensure reliable triggering even in the presence of noise. The pulse width can be controlled by selecting appropriate values for the external resistor and capacitor connected to the RCext pin.

Detailed Application Field Plans

The SN74LV221APW finds applications in various fields, including:

1. Timing circuits in electronic devices
2. Pulse generation for digital systems
3. Delay circuits in communication systems
4. Frequency division in clock generation
5. Control signal generation in industrial automation

Detailed and Complete Alternative Models

1. SN74LV123APW - Similar dual monostable multivibrator IC with slightly different specifications
2. CD74HC221E - Dual monostable multivibrator IC with higher maximum clock frequency
3. MC14538B - Dual precision monostable multivibrator IC with additional features

These alternative models provide similar functionality and can be considered based on specific requirements.

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