Overview
The MC74HC4538ADR2G, produced by onsemi, is a dual precision monostable multivibrator that is retriggerable and resettable. This device is part of the HC series and is compatible with CMOS, NMOS, and TTL logic. It is designed to generate precise output pulses over a wide range of pulse widths, making it versatile for various timing and pulse generation applications. Although the device is discontinued and not recommended for new designs, it remains relevant for existing systems and legacy 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 |
| Operating Voltage Range | 3.0 to 6.0 | V |
| Minimum High-Level Input Voltage (VIH) | 2.0 to 6.0 | V |
| Maximum Low-Level Input Voltage (VIL) | 0.5 to 1.8 | V |
| Minimum High-Level Output Voltage (VOH) | 1.9 to 5.9 | V |
| Maximum Low-Level Output Voltage (VOL) | 0.1 | V |
| Maximum Input Leakage Current (A, B, Reset) | ±1.0 | μA |
| Maximum Quiescent Supply Current (ICC) | 130 to 350 | μA |
| Maximum Propagation Delay (tPLH) | 175 to 265 | ns |
| Minimum Retrigger Time (trr) | No Limit | ns |
| Output Pulse Width (τ) | Dependent on Rx and Cx | s |
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 the requirements defined by 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 MC74HC4538ADR2G is suitable for a variety of applications requiring precise timing and pulse generation, including:
- Timing circuits in digital systems.
- Pulse stretching and shaping.
- Frequency division and counting.
- Automotive systems requiring AEC-Q100 qualification.
- Legacy systems where compatibility with CMOS, NMOS, and TTL logic is necessary.
Q & A
- What is the operating voltage range of the MC74HC4538ADR2G?
The operating voltage range is 3.0 to 6.0 volts.
- Can the MC74HC4538ADR2G be triggered by both positive and negative edges?
- What is the maximum propagation delay of the MC74HC4538ADR2G?
The maximum propagation delay is between 175 to 265 nanoseconds.
- Is the MC74HC4538ADR2G RoHS compliant?
- What is the output drive capability of the MC74HC4538ADR2G?
The output drive capability is 10 LSTTL loads.
- Can unused inputs be left open on the MC74HC4538ADR2G?
No, unused inputs must be tied to a high-logic voltage level or a low-logic input voltage level.
- How is the output pulse width determined for the MC74HC4538ADR2G?
The output pulse width is determined by the external timing components, Rx and Cx.
- Is the MC74HC4538ADR2G suitable for automotive applications?
- What is the maximum input leakage current for the trigger inputs?
The maximum input leakage current for the trigger inputs is ±1.0 μA.
- Can the MC74HC4538ADR2G be reset?
