Overview
The MC74HC4538ADG is a dual precision monostable multivibrator produced by onsemi. This device is designed to generate precise output pulses in response to input triggers and is compatible with various logic families including CMOS, NMOS, and TTL. Although it is discontinued and not recommended for new designs, it remains a significant component in existing systems. The MC74HC4538ADG operates over a wide voltage range of 3.0 to 6.0 volts and features high noise immunity and low input current, making it suitable for a variety of applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| DC Supply Voltage (VCC) | −0.5 to +7.0 | V |
| DC Input Voltage (VI) | −0.5 ≤ VI ≤ VCC + 0.5 | V |
| DC Output Voltage (VO) | −0.5 ≤ VO ≤ VCC + 0.5 | V |
| Minimum High-Level Input Voltage (VIH) | 2.0 to 6.0 | V |
| Maximum Low-Level Input Voltage (VIL) | 0 to 2.0 | V |
| Maximum Propagation Delay (tPLH) | 175 to 265 | ns |
| Output Pulse Width (τ) | Dependent on Rx and Cx (e.g., τ = kRxCx) | s |
| Operating Temperature Range | −55 to 125 | °C |
| Package Type | SOIC-16, TSSOP-16 | |
| Dimensions (SOIC-16) | 10 x 4 x 1.5 mm |
Key Features
- Unlimited rise and fall times allowed on the trigger inputs
- Output pulse is independent of the trigger pulse width
- ±10% guaranteed pulse width variation from part to part (using the same test jig)
- Output drive capability: 10 LSTTL loads
- Outputs directly interface to CMOS, NMOS, and TTL
- Low input current: 1.0 μA
- High noise immunity characteristic of CMOS devices
- In compliance with JEDEC Standard No. 7A
- Pb-free, halogen-free, and RoHS compliant
- AEC-Q100 qualified and PPAP capable for automotive and other applications requiring unique site and control change requirements
Applications
The MC74HC4538ADG is versatile and can be used in various applications requiring precise timing and pulse generation. Some common applications include:
- Timing circuits in digital systems
- Pulse stretching and pulse shaping
- Debouncing switches and contacts
- Generating clock signals
- Automotive systems requiring AEC-Q100 compliance
Q & A
- What is the operating voltage range of the MC74HC4538ADG?
The operating voltage range is from 3.0 to 6.0 volts.
- What types of logic families is the MC74HC4538ADG compatible with?
The device is compatible with CMOS, NMOS, and TTL logic families.
- How is the output pulse width determined in the MC74HC4538ADG?
The output pulse width is determined by the external timing components, Rx and Cx, using the formula τ = kRxCx.
- What is the maximum propagation delay of the MC74HC4538ADG?
The maximum propagation delay ranges from 175 to 265 ns depending on the operating conditions.
- Is the MC74HC4538ADG suitable for automotive applications?
- What are the package types available for the MC74HC4538ADG?
The device is available in SOIC-16 and TSSOP-16 packages.
- What are the dimensions of the SOIC-16 package?
The dimensions of the SOIC-16 package are 10 x 4 x 1.5 mm.
- Is the MC74HC4538ADG RoHS compliant?
- Can the MC74HC4538ADG be triggered by both positive and negative edges?
- What is the reset function of the MC74HC4538ADG?
The reset function forces the Q output low and the Q output high, regardless of the state of the output pulse circuitry.
