Overview
The 74HC4538PW,112 is a dual retriggerable-resettable monostable multivibrator produced by Nexperia USA Inc. This integrated circuit is part of the 74HC series, known for its high-speed CMOS logic. Each multivibrator in the 74HC4538 has two trigger/retrigger inputs (nA and nB), a direct reset input (nCD), and two complementary outputs (nQ and nQ). The device also includes pins for connecting external timing components CEXT and REXT, which determine the output pulse width. The 74HC4538 is designed for precise control of the output pulse width and features Schmitt-trigger action in the trigger inputs, making it highly tolerant to slower rise and fall times.
Key Specifications
| Parameter | Value |
|---|---|
| Type Number | 74HC4538PW |
| Package | TSSOP16 (SOT403-1) |
| VCC (V) | 2.0 - 6.0 |
| Logic Switching Levels | CMOS |
| Output Drive Capability (mA) | ± 5.2 |
| tpd (ns) | 27 |
| Minimum Operating Temperature (°C) | -40 |
| Maximum Operating Temperature (°C) | 125 |
| Power Dissipation Considerations | Low |
| Rth(j-a) (K/W) | 109 |
| Ψth(j-top) (K/W) | 1 |
| Rth(j-c) (K/W) | 37 |
Key Features
- Dual retriggerable-resettable monostable multivibrator with 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 to determine the output pulse width.
- Output pulse width (TW) is equal to 0.7 × REXT × CEXT.
- Schmitt-trigger action in the trigger inputs for high tolerance to slower rise and fall times.
- Inputs include clamp diodes, enabling the use of current limiting resistors to interface inputs to voltages in excess of VCC.
- Wide supply voltage range from 2.0 to 6.0 V.
- Low power dissipation.
Applications
The 74HC4538PW is versatile and can be used in various applications across different industries, including:
- Automotive systems: For timing and pulse generation in automotive electronics.
- Industrial control systems: In applications requiring precise timing and pulse control.
- Consumer electronics: In devices that need reliable and accurate timing signals.
- Computing and data processing: For generating timing signals in digital circuits.
- Mobile and wearable devices: Where low power consumption and precise timing are crucial.
Q & A
- What is the 74HC4538PW,112 used for?
The 74HC4538PW,112 is a dual retriggerable-resettable monostable multivibrator used for generating precise timing signals in various electronic circuits.
- What is the supply voltage range of the 74HC4538PW?
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 features of the trigger inputs?
The trigger inputs feature Schmitt-trigger action, making them highly tolerant to slower rise and fall times.
- Can the inputs handle voltages in excess of VCC?
- What is the operating temperature range of the 74HC4538PW?
The operating temperature range is from -40°C to 125°C.
- What is the package type of the 74HC4538PW,112?
The package type is TSSOP16 (SOT403-1).
- What are some typical applications of the 74HC4538PW?
Typical applications include automotive systems, industrial control systems, consumer electronics, computing, and mobile devices.
- How does the direct reset input function?
A LOW level at the nCD input terminates the output pulse immediately.
- What is the output drive capability of the 74HC4538PW?
The output drive capability is ± 5.2 mA.
