Overview
The HCF4047BEY, produced by STMicroelectronics, is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor (MOS) technology. This component is a low-power monostable/astable multivibrator available in various package types, including DIP and SOP. It is designed to operate in both monostable (one-shot) and astable (free-running) modes, making it versatile for a range of applications. The HCF4047BEY incorporates logic techniques to permit positive or negative edge-triggered monostable multivibrator action with retriggering and external counting options.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VDD) | 3 to 20 | V |
| Input Voltage (VI) | 0 to VDD + 0.5 | V |
| Operating Temperature (Top) | -55 to 125 | °C |
| Storage Temperature (Tstg) | -65 to 150 | °C |
| Quiescent Current (IL) | 0.01 to 600 | µA |
| High Level Output Voltage (VOH) | 4.95 to 14.95 | V |
| Low Level Output Voltage (VOL) | 0.05 | V |
| Propagation Delay Time (tPLH, tPHL) | 100 to 1000 | ns |
| Input Leakage Current (II) | ±1 µA | µA |
Key Features
- Low power consumption with a special CMOS oscillator configuration.
- Monostable (one-shot) or astable (free-running) operation.
- True and complemented buffered outputs.
- Only one external resistor and capacitor required for operation.
- Buffered inputs.
- Quiescent current specified up to 20V.
- Standardized, symmetrical output characteristics.
- Positive or negative edge-triggered monostable multivibrator action with retriggering and external counting options.
Applications
The HCF4047BEY is suitable for a variety of applications, including:
- Pulse generation and shaping in digital circuits.
- Timing and sequencing in electronic systems.
- Frequency division and counting circuits.
- Retriggerable pulse extension and frequency comparison.
- External countdown and reset functions in complex digital systems.
Q & A
- What are the primary operating modes of the HCF4047BEY?
The HCF4047BEY operates in both monostable (one-shot) and astable (free-running) modes.
- What are the key inputs and outputs of the HCF4047BEY?
The key inputs include +TRIGGER, -TRIGGER, ASTABLE, RETRIGGER, and EXTERNAL RESET. The outputs are Q, Q, and OSCILLATOR.
- What external components are required for the HCF4047BEY to operate?
An external capacitor and resistor are required, connected between the C-Timing, R-Timing, and RC-Common terminals.
- What is the power consumption characteristic of the HCF4047BEY?
The power consumption is low, with most power dissipated in the external timing capacitor. The power dissipation formula varies depending on the mode of operation.
- How does the HCF4047BEY handle retriggering?
The HCF4047BEY can be retriggered by applying a common pulse to both the RETRIGGER and +TRIGGER inputs, extending the output pulse duration.
- What is the significance of the EXTERNAL RESET input?
The EXTERNAL RESET input can terminate the output pulse at any time and ensure no output pulse during power-on conditions.
- What are the temperature and voltage ranges for the HCF4047BEY?
The operating temperature range is -55 to 125°C, and the supply voltage range is 3 to 20V.
- How does the HCF4047BEY support external counting?
External counting can be implemented by coupling the Q output to an external counter and resetting the counter with the trigger pulse.
- What are the propagation delay times for the HCF4047BEY?
The propagation delay times vary from 100 to 1000 ns depending on the mode and supply voltage.
- What is the input leakage current specification for the HCF4047BEY?
The input leakage current is specified as ±1 µA.
