Overview
The CD74HC221M96E4 is a High Speed CMOS Logic Dual Monostable Multivibrator with Reset, produced by Texas Instruments. This device is designed to provide reliable and efficient timing functions in a variety of digital circuits. It features two independent monostable multivibrators, each capable of generating a single pulse from a trigger signal. The device operates over a wide voltage range and is suitable for use in diverse applications requiring precise timing and signal processing.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| High-Level Input Voltage (VIH) | 1.5 (VCC=2V) | 3.15 (VCC=4.5V) | 4.2 (VCC=6V) | V |
| Low-Level Input Voltage (VIL) | 0.5 (VCC=2V) | 1.35 (VCC=4.5V) | 1.8 (VCC=6V) | V |
| Operating Free-Air Temperature (TA) | -55 | - | 125 | °C |
| Propagation Delay (A, B, C, or D to Y) | 19 (VCC=6V, CL=50pF) | 24 | 28 | ns |
| Continuous Output Current | -25 | - | 25 | mA |
| Continuous Current through VCC or GND | -50 | - | 50 | mA |
Key Features
- High Speed CMOS Logic: The CD74HC221M96E4 operates with high speed and low power consumption, making it suitable for a wide range of applications.
- Dual Monostable Multivibrators: Each multivibrator can generate a single pulse from a trigger signal, providing flexibility in timing and signal processing.
- Reset Capability: Each multivibrator has a reset input, allowing for precise control over the timing signals.
- Wide Operating Voltage Range: The device operates from 2 V to 6 V, making it compatible with various power supply systems.
- Wide Operating Temperature Range: The device can operate from -55°C to 125°C, ensuring reliability in diverse environmental conditions.
- Low Power Consumption: The device is designed to reduce power consumption compared to LSTTL logic ICs.
Applications
- Timing and Signal Processing: The CD74HC221M96E4 is ideal for applications requiring precise timing and signal processing, such as in digital circuits, communication systems, and control systems.
- Pulse Generation: The device can be used to generate single pulses from trigger signals, which is useful in various digital and analog circuits.
- Resettable Timers: The reset capability makes it suitable for applications where the timing signal needs to be reset or synchronized.
- Automotive and Industrial Systems: The wide operating temperature range and robust design make it suitable for use in automotive and industrial environments.
Q & A
- What is the operating voltage range of the CD74HC221M96E4?
The operating voltage range is from 2 V to 6 V.
- What is the maximum operating temperature of the CD74HC221M96E4?
The maximum operating temperature is 125°C.
- Does the CD74HC221M96E4 have a reset feature?
Yes, each monostable multivibrator has a reset input.
- What is the typical propagation delay of the CD74HC221M96E4?
The typical propagation delay is around 19-28 ns for VCC=6V and CL=50pF.
- Can the CD74HC221M96E4 be used in automotive applications?
Yes, due to its wide operating temperature range and robust design, it is suitable for automotive applications.
- How many monostable multivibrators are included in the CD74HC221M96E4?
The device includes two independent monostable multivibrators.
- What is the continuous output current limit of the CD74HC221M96E4?
The continuous output current limit is ±25 mA.
- What is the recommended bypass capacitor for the power supply?
A 0.1-μF capacitor is recommended, and it is acceptable to parallel multiple bypass caps to reject different frequencies of noise.
- Can unused inputs be left floating?
No, unused inputs must be terminated to either VCC or ground to prevent oscillations and damaging shoot-through current.
- What is the significance of the low power consumption of the CD74HC221M96E4?
The low power consumption reduces the overall energy usage and heat generation, making it more efficient compared to LSTTL logic ICs.
