Overview
The 74HCT221D,118 is a dual non-retriggerable monostable multivibrator produced by Nexperia USA Inc. This integrated circuit is part of the 74HCT family and is designed to provide reliable and stable pulse generation in various electronic systems. Each multivibrator within the IC features edge-triggered inputs (nA and nB), which can be used as enable inputs, and includes Schmitt-trigger input circuitry for the nB inputs to ensure jitter-free triggering and excellent noise immunity. The output pulse width is determined by external components, and the outputs are independent of further transitions of the input signals once triggered. The IC also includes active LOW reset inputs (nRD) to terminate the output pulses.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Type Number | 74HCT221D | - |
| Orderable Part Number | 74HCT221D,118 | - |
| Package | SO16 (SOT109-1) | - |
| VCC | 4.5 - 5.5 | V |
| Logic Switching Levels | TTL | - |
| Output Drive Capability | ± 4 | mA |
| Propagation Delay (tpd) | 32 ns (typical at VCC = 5 V, CL = 15 pF) | ns |
| Operating Temperature Range | -40 °C to +125 °C | °C |
| Thermal Resistance (Rth(j-a)) | 62 K/W | K/W |
Key Features
- Edge-Triggered Inputs: Each multivibrator features edge-triggered inputs (nA and nB), which can be used as enable inputs.
- Schmitt-Trigger Input Circuitry: nB inputs have Schmitt-trigger circuitry, ensuring jitter-free triggering from inputs with slow transition rates and providing excellent noise immunity.
- Output Pulse Width Control: The output pulse width is defined by external timing components (REXT and CEXT).
- Active LOW Reset Inputs: Output pulses can be terminated by active LOW reset inputs (nRD).
- Low Power Dissipation: The IC has low power dissipation considerations.
- Wide Operating Temperature Range: Operates from -40 °C to +125 °C.
- TTL Compatibility: Compatible with TTL logic levels.
Applications
The 74HCT221D,118 is suitable for a variety of applications across different industries, including:
- Automotive Systems: For reliable pulse generation in automotive electronics.
- Industrial Control Systems: In industrial automation and control systems where stable and noise-immune pulse generation is required.
- Consumer Electronics: In consumer devices that require precise timing and pulse generation.
- Computing and Power Systems: For timing and pulse generation in computing and power management systems.
- Mobile and Wearable Devices: In mobile and wearable devices where low power consumption and reliable operation are critical.
Q & A
- What is the 74HCT221D,118?
The 74HCT221D,118 is a dual non-retriggerable monostable multivibrator IC produced by Nexperia USA Inc.
- What are the key inputs of the 74HCT221D,118?
The IC features edge-triggered inputs (nA and nB) and active LOW reset inputs (nRD).
- How is the output pulse width controlled?
The output pulse width is controlled by external timing components (REXT and CEXT).
- What is the operating temperature range of the 74HCT221D,118?
The IC operates from -40 °C to +125 °C.
- Is the 74HCT221D,118 compatible with TTL logic levels?
- What package type does the 74HCT221D,118 come in?
The IC comes in a SO16 (SOT109-1) package.
- How does the Schmitt-trigger input circuitry benefit the IC?
The Schmitt-trigger input circuitry ensures jitter-free triggering from inputs with slow transition rates and provides excellent noise immunity.
- Can the output pulses be terminated?
- What is the typical propagation delay of the 74HCT221D,118?
The typical propagation delay is 32 ns at VCC = 5 V and CL = 15 pF.
- What are some common applications of the 74HCT221D,118?
The IC is used in automotive, industrial, consumer electronics, computing, and power systems, as well as in mobile and wearable devices.
