Overview
The 74HC4538D, produced by NXP USA Inc., is a dual retriggerable-resettable monostable multivibrator. This integrated circuit is fabricated using silicon gate C2MOS technology, which combines high-speed operation with low power dissipation characteristic of CMOS devices. Each multivibrator within the 74HC4538D has two trigger/retrigger inputs (nA and nB), a direct reset input (nCD), and two complementary outputs (nQ and nQbar). The device also includes pins for connecting external timing components (CEXT and REXT) to determine the output pulse width.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| VCC (Supply Voltage) | 2.0 to 6.0 | V | |
| Logic Switching Levels | CMOS | ||
| Output Drive Capability | ± 5.2 | mA | |
| Propagation Delay (tpd) | 27 | ns | |
| Operating Temperature | -40 to 125 | °C | |
| Package Type | SO16 (SOT109-1) | ||
| ESD Protection | HBM: >2000 V, CDM: >1000 V | ANSI/ESDA/JEDEC JS-001 Class 2 and JS-002 Class C3 |
Key Features
- Dual retriggerable-resettable monostable multivibrator with two trigger/retrigger inputs and a direct reset input.
- High-speed operation with CMOS low power dissipation.
- Schmitt-trigger action in the trigger inputs, tolerant to slow rise and fall times.
- Separate reset inputs and the ability to trigger from either the positive or negative edges of the input pulse.
- Wide supply voltage range from 2.0 to 6.0 V.
- High noise immunity and latch-up performance exceeding 100 mA per JESD 78 Class II Level B.
- Compliance with JEDEC standards (JESD8C and JESD7A).
- ESD protection exceeding 2000 V (HBM) and 1000 V (CDM).
Applications
The 74HC4538D is versatile and can be used in various applications requiring precise timing and pulse generation. Some common applications include:
- 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 where robust and reliable timing is crucial.
Q & A
- What is the 74HC4538D?
The 74HC4538D is a dual retriggerable-resettable monostable multivibrator integrated circuit.
- What is the supply voltage range of the 74HC4538D?
The supply voltage range is from 2.0 to 6.0 V.
- How are the output pulse widths determined?
The output pulse widths are determined by the external timing components CEXT and REXT, with the pulse width (TW) equal to 0.7 × REXT × CEXT.
- What are the trigger inputs capable of?
The trigger inputs (nA and nB) can be triggered by either the positive or negative edges of the input pulse and are tolerant to slow rise and fall times due to Schmitt-trigger action.
- What is the operating temperature range of the 74HC4538D?
The operating temperature range is from -40°C to 125°C.
- Does the 74HC4538D have ESD protection?
- What package type is the 74HC4538D available in?
The 74HC4538D is available in a SO16 (SOT109-1) package.
- Is the 74HC4538D RoHS compliant?
- What are some common applications of the 74HC4538D?
- How does the reset input function?
