Overview
The 74HC4538D/S400118 is a dual retriggerable-resettable monostable multivibrator produced by NXP USA Inc. This component is part of the 74HC series and is fabricated using silicon gate C2MOS technology, which combines high-speed operation with low power dissipation characteristic of CMOS devices. Each multivibrator in the 74HC4538D has two trigger/retrigger inputs (nA and nB), a direct reset input (nCD), two complementary outputs (nQ and nQ), and pins for connecting external timing components (CEXT and REXT). The device can be triggered by either the positive or negative edges of the input pulse, and the output pulse width is determined by the external timing components.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Supply Voltage (VCC) | 2.0 to 6.0 | V | |
| Operating Temperature | -40 to 125 | °C | |
| Logic Type | Monostable | ||
| Package / Case | 16-SOIC (0.154", 3.90mm Width) | ||
| Output Drive Capability | ± 5.2 | mA | |
| Propagation Delay (tpd) | 27 | ns | |
| Output Pulse Width (TW) | 0.7 × REXT × CEXT | Determined by external components | |
| ESD Protection | HBM: > 2000 V, CDM: > 1000 V | ANSI/ESDA/JEDEC JS-001 Class 2 and JS-002 Class C3 |
Key Features
- Dual Monostable Multivibrator: Each multivibrator has two trigger/retrigger inputs and a direct reset input.
- High-Speed Operation: Achieves high-speed operation similar to equivalent LSTTL while maintaining CMOS low power dissipation.
- Schmitt-Trigger Inputs: Inputs are tolerant of slow rise and fall times, making the circuit highly tolerant to slower signal edges.
- External Timing Components: The output pulse width is determined by external resistor and capacitor (REXT and CEXT).
- Wide Supply Voltage Range: Operates from 2.0 to 6.0 V.
- High Noise Immunity: Complies with JEDEC standards and has high noise immunity.
- ESD Protection: Exceeds 2000 V HBM and 1000 V CDM.
Applications
The 74HC4538D/S400118 is suitable for various applications requiring precise timing and pulse generation, such as:
- Pulse generators and timing circuits in digital systems.
- Trigger circuits for sensors and actuators.
- Timing and synchronization in communication systems.
- Automotive and industrial control systems requiring robust and reliable timing functions.
Q & A
- What is the 74HC4538D/S400118?
The 74HC4538D/S400118 is a dual retriggerable-resettable monostable multivibrator produced by NXP USA Inc.
- 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 REXT and CEXT, calculated as 0.7 × REXT × CEXT.
- What type of inputs does the 74HC4538D have?
The device has Schmitt-trigger inputs that are tolerant of slow rise and fall times.
- What is the operating temperature range of the 74HC4538D?
The operating temperature range is from -40 to 125 °C.
- Does the 74HC4538D have ESD protection?
Yes, it exceeds 2000 V HBM and 1000 V CDM.
- What is the package type of the 74HC4538D/S400118?
The package type is 16-SOIC (0.154", 3.90mm Width).
- How many independent circuits does the 74HC4538D contain?
The device contains two independent monostable multivibrator circuits.
- What is the propagation delay of the 74HC4538D?
The propagation delay (tpd) is approximately 27 ns.
- Is the 74HC4538D RoHS compliant?
Yes, the 74HC4538D/S400118 is RoHS compliant.
