Overview
The 74HC123D is a high-speed CMOS dual monostable multivibrator integrated circuit manufactured by Toshiba Semiconductor and Storage. This device is part of the 74HC series and is fabricated using silicon gate C2MOS technology, which combines high-speed operation similar to LSTTL with the low power dissipation characteristics of CMOS.
The 74HC123D features two independent monostable multivibrators, each with Schmitt trigger inputs that can handle slow rise/fall time signals. The device can be triggered by either the A input (negative edge) or the B input (positive edge), or by the CLR input (positive edge). The output pulse width is determined by external resistor and capacitor (RX, CX) configurations.
Key Specifications
| Characteristic | Symbol | Value | Unit |
|---|---|---|---|
| Package | 16-SOIC (0.154", 3.90mm Width) | ||
| Logic Type | Monostable | ||
| Independent Circuits | 2 | ||
| Schmitt Trigger Input | Yes | ||
| Propagation Delay | tpd_tpz | 25 ns (Typ. at VCC=5V) | ns |
| Output Current - High, Low | 5.2 mA, 5.2 mA | mA | |
| Supply Voltage | VCC | 2 V ~ 6 V | V |
| Operating Temperature | T opr | -40°C ~ 85°C | °C |
| Mounting Type | Surface Mount | ||
| Power Dissipation | P D | 500 mW | mW |
Key Features
- Dual Monostable Multivibrator: The 74HC123D contains two independent monostable multivibrators, allowing for flexible use in various timing and pulse generation applications.
- Schmitt Trigger Inputs: The device features Schmitt trigger inputs on A and B inputs, which are tolerant of slow rise/fall time signals, ensuring reliable triggering.
- External Timing Control: The output pulse width is controlled by external resistor and capacitor configurations, providing flexibility in setting the desired pulse duration.
- Low Power Consumption: Fabricated with silicon gate C2MOS technology, the 74HC123D offers low power dissipation while maintaining high-speed operation.
- Wide Operating Voltage Range: The device operates over a supply voltage range of 2 V to 6 V, making it suitable for a variety of power supply conditions.
- High Temperature Range: The 74HC123D can operate in temperatures ranging from -40°C to 85°C, ensuring reliability in diverse environmental conditions.
Applications
- Timing and Pulse Generation: The 74HC123D is ideal for generating precise timing pulses in digital circuits.
- Sequential Logic Circuits: It can be used in sequential logic circuits where timed pulses are necessary for controlling the sequence of operations.
- Alarm and Warning Systems: The device can be employed in alarm and warning systems to generate timed signals.
- Automotive Electronics: Its wide operating temperature range makes it suitable for use in automotive electronics.
- Industrial Control Systems: The 74HC123D can be used in industrial control systems for timing and sequencing applications.
Q & A
- What is the 74HC123D?
The 74HC123D is a high-speed CMOS dual monostable multivibrator integrated circuit.
- Who manufactures the 74HC123D?
The 74HC123D is manufactured by Toshiba Semiconductor and Storage.
- What is the package type of the 74HC123D?
The 74HC123D comes in a 16-SOIC package.
- How many independent circuits does the 74HC123D contain?
The 74HC123D contains two independent monostable multivibrators.
- What is the operating voltage range of the 74HC123D?
The device operates over a supply voltage range of 2 V to 6 V.
- What is the propagation delay of the 74HC123D?
The propagation delay is typically 25 ns at VCC=5V.
- How is the output pulse width controlled in the 74HC123D?
The output pulse width is controlled by external resistor and capacitor configurations.
- Does the 74HC123D have Schmitt trigger inputs?
Yes, the device features Schmitt trigger inputs on A and B inputs.
- What is the operating temperature range of the 74HC123D?
The device can operate in temperatures ranging from -40°C to 85°C.
- What are some common applications of the 74HC123D?
Common applications include timing and pulse generation, sequential logic circuits, alarm and warning systems, automotive electronics, and industrial control systems.
