Overview
The 74HC4538D is a dual retriggerable-resettable monostable multivibrator produced by Toshiba Semiconductor and Storage. This integrated circuit is part of the HC/UH series and is designed for high-speed CMOS logic applications. Each multivibrator in the 74HC4538D has two trigger/retrigger inputs, a direct reset input, and two complementary outputs. The device is highly versatile and can be triggered by either the positive or negative edges of the input pulse, making it suitable for a wide range of electronic circuits.
Key Specifications
| Type number | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Rth(j-a) (K/W) | Ψth(j-top) (K/W) | Rth(j-c) (K/W) | Package name |
|---|---|---|---|---|---|---|---|---|---|---|
| 74HC4538D | 2.0 - 6.0 | CMOS | ± 5.2 | 27 | low | -40~125 | 77 | 2.5 | 35 | SO16 |
Key Features
- Dual retriggerable-resettable monostable multivibrator
- Two trigger/retrigger inputs (nA and nB) and a direct reset input (nCD)
- Two complementary outputs (nQ and nQ)
- Pins for connecting external timing components CEXT and REXT
- Pulse width determined by 0.7 × REXT × CEXT
- Schmitt-trigger action in trigger inputs for high noise immunity and tolerance to slow rise and fall times
- CMOS low power dissipation
- Wide supply voltage range from 2.0 to 6.0 V
- ESD protection: HBM exceeds 2000 V, CDM exceeds 1000 V
- Complies with JEDEC standards JESD8C and JESD7A
Applications
The 74HC4538D is suitable for various applications requiring precise timing and pulse generation, such as:
- Timing circuits in digital systems
- Pulse generators in electronic instruments
- Reset circuits in microprocessor systems
- Delay circuits in communication systems
- General-purpose monostable multivibrator applications
Q & A
- What is the 74HC4538D? The 74HC4538D is a dual retriggerable-resettable monostable multivibrator.
- Who manufactures the 74HC4538D? The 74HC4538D is manufactured by Toshiba Semiconductor and Storage.
- What is the supply voltage range of the 74HC4538D? The supply voltage range is from 2.0 to 6.0 V.
- How is the output pulse width determined? The output pulse width is determined by the external timing components CEXT and REXT and is equal to 0.7 × REXT × CEXT.
- What are the key inputs and outputs of the 74HC4538D? The device has two trigger/retrigger inputs (nA and nB), a direct reset input (nCD), and two complementary outputs (nQ and nQ).
- What is the package type of the 74HC4538D? The package type is SO16 (SOT109-1).
- What are the ESD protection levels of the 74HC4538D? The device has ESD protection levels exceeding 2000 V for HBM and 1000 V for CDM.
- What are the operating temperature ranges for the 74HC4538D? The device operates from -40 °C to +125 °C.
- Is the 74HC4538D compliant with any specific standards? Yes, it complies with JEDEC standards JESD8C and JESD7A.
- What are some typical applications of the 74HC4538D? Typical applications include timing circuits, pulse generators, reset circuits, and delay circuits in various electronic systems.
