Overview
The 74HC4538PW/S400118 is a dual retriggerable-resettable monostable multivibrator produced by Nexperia, which was previously part of NXP USA Inc. This component is designed to provide precise and reliable timing functions in various electronic circuits. Each multivibrator within the device has two trigger/retrigger inputs, a direct reset input, and two complementary outputs. The device also includes pins for connecting external timing components, allowing for precise control over the output pulse width.
Key Specifications
| Parameter | Value |
|---|---|
| Type Number | 74HC4538PW |
| Supply Voltage (VCC) | 2.0 to 6.0 V |
| Logic Switching Levels | CMOS |
| Output Drive Capability | ± 5.2 mA |
| Propagation Delay (tpd) | 27 ns |
| Operating Temperature (Tamb) | -40 °C to +125 °C |
| Package | TSSOP16 (SOT403-1) |
| ESD Protection | HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V, CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V |
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
- Typical pulse width variation over temperature range: ± 0.2 %
- Schmitt-trigger action in the trigger inputs for high noise immunity
- Inputs include clamp diodes for interfacing with voltages in excess of VCC
- Low power dissipation
- Complies with JEDEC standards (JESD8C and JESD7A)
Applications
- Timing and pulse generation in digital circuits
- Reset and trigger functions in microcontroller and microprocessor systems
- Pulse stretching and debouncing applications
- Frequency division and counting circuits
- General-purpose logic circuits requiring precise timing
Q & A
- What is the 74HC4538PW/S400118 used for?
The 74HC4538PW/S400118 is used as a dual retriggerable-resettable monostable multivibrator, providing precise timing functions in electronic circuits.
- What is the supply voltage range for 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, calculated as 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 and providing high noise immunity.
- What is the operating temperature range of the 74HC4538PW?
The operating temperature range is from -40 °C to +125 °C.
- What type of package does the 74HC4538PW come in?
The device comes in a TSSOP16 (SOT403-1) package.
- Does the 74HC4538PW have ESD protection?
- Can the 74HC4538PW be triggered by both rising and falling edges?
- How does the reset function work on the 74HC4538PW?
A LOW level at the nCD input terminates the output pulse immediately.
- Is the 74HC4538PW compliant with any industry standards?
