Overview
The HCF4538BEY, produced by STMicroelectronics, is a dual precision monostable multivibrator integrated circuit. This device is fabricated in Metal Oxide Semiconductor (MOS) technology and is available in various packages, including the 16-lead plastic DIP and SOP packages. The HCF4538BEY provides stable retriggerable/resettable one-shot operation for any fixed-voltage timing application. It features external resistor (RX) and capacitor (CX) control for timing and accuracy, allowing a wide range of output pulse widths from the Q and Q terminals.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VDD) | 3 to 18 | V |
| Input Voltage (VI) | 0 to VDD + 0.5 | V |
| Operating Temperature | -40 to +85 | °C |
| Storage Temperature | -65 to +150 | °C |
| Quiescent Current (IL) | 0.04 to 3000 | µA |
| High Level Output Voltage (VOH) | 4.95 to 14.95 | V |
| Low Level Output Voltage (VOL) | 0.05 | V |
| Propagation Delay Time (+TR or -TR to Q or Q) | 100 to 600 | ns |
| Minimum External Resistance (RX) | 4KΩ | Ω |
| External Capacitance (CX) Range | 5nF to 100µF | F |
Key Features
- Retriggerable and resettable one-shot operation
- External resistor (RX) and capacitor (CX) control for timing and accuracy
- Leading edge and trailing edge triggering capabilities
- Separate reset inputs for immediate termination of the output pulse
- Schmitt trigger inputs allowing unlimited rise and fall times
- Low input leakage current (II = 100nA max at VDD = 18V, TA = 25°C)
- Buffered Q and Q outputs available
- Wide range of output pulse widths achievable
- Compliant with JEDEC JESD13B standard specifications for B series CMOS devices
Applications
The HCF4538BEY is suitable for a variety of timing and pulse generation applications in electronic circuits. It can be used in:
- Pulse width modulation and generation
- Timing circuits in digital systems
- Trigger and reset circuits in control systems
- Audio and video equipment for timing and synchronization
- Industrial control systems requiring precise timing and pulse generation
Q & A
- What is the HCF4538BEY?
The HCF4538BEY is a dual precision monostable multivibrator integrated circuit produced by STMicroelectronics.
- What are the key applications of the HCF4538BEY?
It is used in pulse width modulation, timing circuits, trigger and reset circuits, audio and video equipment, and industrial control systems.
- How is the timing controlled in the HCF4538BEY?
The timing is controlled by an external resistor (RX) and an external capacitor (CX).
- What are the minimum and maximum values for the external resistance (RX) and capacitance (CX)?
The minimum RX value is 4KΩ, and the minimum CX value is 5nF. The maximum CX value is 100µF.
- Does the HCF4538BEY support both leading and trailing edge triggering?
- What is the operating temperature range for the HCF4538BEY?
The operating temperature range is -40 to +85°C.
- What is the quiescent current range for the HCF4538BEY?
The quiescent current range is from 0.04 to 3000 µA.
- Is the HCF4538BEY compliant with any industry standards?
- How do you prevent output pulses when power is turned on?
An unused RESET input should be tied to VDD to prevent output pulses when power is turned on.
- What are the package options available for the HCF4538BEY?
