Overview
The 74HC4538PW,118 is a dual retriggerable-resettable monostable multivibrator produced by Nexperia USA Inc. This integrated circuit is part of the 74HC series and is designed to provide precise and reliable timing functions in various electronic systems. Each multivibrator within the device features 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) to control the output pulse width accurately.
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 74HC4538PW | 2.0 - 6.0 | CMOS | ± 5.2 | 27 | Low | -40 to 125 | 109 | 1 | 37 | TSSOP16 |
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 control the output pulse width.
- Output pulse width determined by 0.7 × REXT × CEXT.
- Schmitt-trigger action in the trigger inputs for high tolerance to slower rise and fall times.
- Inputs include clamp diodes for interfacing with voltages in excess of VCC.
- Wide supply voltage range from 2.0 to 6.0 V.
- Low power dissipation.
- Operating temperature range from -40°C to 125°C.
Applications
The 74HC4538PW,118 is versatile and can be used in a variety of applications across different industries, including:
- Automotive systems for timing and control functions.
- Industrial automation for precise timing and sequencing.
- Consumer electronics for reliable and efficient timing operations.
- Mobile and wearable devices where low power consumption is crucial.
- Computing and power management systems requiring accurate timing signals.
Q & A
- What is the primary function of the 74HC4538PW,118?
The primary function is to act as a dual retriggerable-resettable monostable multivibrator, providing precise timing signals.
- What is the supply voltage range for the 74HC4538PW,118?
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 is the operating temperature range of the device?
The operating temperature range is from -40°C to 125°C.
- Does the device include any protection features for the inputs?
Yes, the inputs include clamp diodes to protect against voltages in excess of VCC.
- What type of package does the 74HC4538PW,118 come in?
The device comes in a TSSOP16 package.
- Is the 74HC4538PW,118 RoHS compliant?
Yes, the device is RoHS compliant.
- What are some common applications for this device?
Common applications include automotive, industrial automation, consumer electronics, mobile devices, and computing systems.
- How does the Schmitt-trigger action benefit the device?
The Schmitt-trigger action makes the circuit highly tolerant to slower rise and fall times of the input pulse.
- Can the device be triggered by both positive and negative edges of the input pulse?
Yes, the device can be triggered by either the positive or the negative edges of the input pulse.
