Overview
The CD74HC221MG4, produced by Texas Instruments, is a High Speed CMOS Logic Dual Monostable Multivibrator with Reset. This integrated circuit is part of the 74HC series and is designed to provide a wide range of output pulse widths controlled by external components. The device features dual monostable multivibrators, each capable of generating a single output pulse in response to a trigger input. The pulse width can be adjusted using an external resistor (RX) and an external capacitor (CX), allowing for a high degree of flexibility in timing and accuracy.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Supply Voltage | VCC | 2 | - | 6 | V |
| Operating Temperature | TA | -55 | - | 125 | °C |
| Input Pulse Width (A) | tWL | 2 | - | 105 | ns |
| Input Pulse Width (B) | tWH | 2 | - | 105 | ns |
| Propagation Delay | - | - | 18 | ns | |
| Output Current (High/Low) | I_OH / I_OL | - | - | 5.2 mA | mA |
| Package Type | - | - | - | 16-SOIC | - |
Key Features
- Dual monostable multivibrators with reset, allowing for independent operation of each multivibrator.
- External resistor (RX) and capacitor (CX) control the timing and accuracy of the output pulse.
- Trailing edge triggering (A) and leading-edge triggering (B) inputs for flexibility in trigger sources.
- Output pulse can be terminated by a LOW level on the Reset (R) pin.
- Wide operating voltage range: 2 V to 6 V.
- Wide operating temperature range: -55°C to 125°C.
- Significant power reduction compared to LSTTL logic ICs.
- Balanced propagation delay and transition times.
- Schmitt trigger inputs for improved noise immunity.
Applications
- Timing and pulse generation in digital circuits.
- Signal processing and conditioning.
- Automotive and industrial control systems where precise timing is required.
- Medical devices requiring stable and adjustable timing signals.
- Consumer electronics needing flexible and reliable timing circuits.
Q & A
- What is the CD74HC221MG4 used for? The CD74HC221MG4 is used as a dual monostable multivibrator with reset, generating adjustable output pulses in response to trigger inputs.
- How is the output pulse width controlled? The output pulse width is controlled by an external resistor (RX) and an external capacitor (CX).
- What are the triggering options for the CD74HC221MG4? The device offers both trailing edge triggering (A) and leading-edge triggering (B) inputs.
- Can the output pulse be terminated? Yes, the output pulse can be terminated by a LOW level on the Reset (R) pin.
- What is the operating voltage range of the CD74HC221MG4? The operating voltage range is from 2 V to 6 V.
- What is the operating temperature range of the CD74HC221MG4? The operating temperature range is from -55°C to 125°C.
- What type of package does the CD74HC221MG4 come in? The CD74HC221MG4 comes in a 16-SOIC package.
- How does the CD74HC221MG4 compare to LSTTL logic ICs in terms of power consumption? The CD74HC221MG4 has significant power reduction compared to LSTTL logic ICs.
- What are some common applications of the CD74HC221MG4? Common applications include timing and pulse generation in digital circuits, signal processing, automotive and industrial control systems, medical devices, and consumer electronics.
- Does the CD74HC221MG4 have Schmitt trigger inputs? Yes, the CD74HC221MG4 has Schmitt trigger inputs for improved noise immunity.
