Overview
The MC74HC4538ADTR2G, produced by onsemi, is a dual precision monostable multivibrator that is retriggerable and resettable. This device is part of the 74HC logic family and is designed to provide precise output pulses over a wide range of pulse widths. It is compatible with standard CMOS outputs and, with pull-up resistors, can also interface with LSTTL outputs. The MC74HC4538ADTR2G is available in a TSSOP-16 package and is Pb-free, halogen-free, and RoHS compliant.
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 |
| Low Input Current | 1.0 µA | A |
| Output Drive Capability | 10 LSTTL Loads | |
| Maximum Propagation Delay (tPLH) | 175 ns (typical at VCC = 5V) | ns |
| Minimum Retrigger Time (trr) | No limit specified | ns |
| Output Pulse Width (τ) | Determined by external timing components Rx and Cx | |
| Pulse Width Variation (Part to Part) | ±10% | % |
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)
- Outputs directly interface to CMOS, NMOS, and TTL
- High noise immunity characteristic of CMOS devices
- In compliance with the requirements defined by JEDEC Standard No. 7A
- AEC-Q100 qualified and PPAP capable for automotive and other applications requiring unique site and control change requirements
- Pb-free, halogen-free, and RoHS compliant
Applications
The MC74HC4538ADTR2G is suitable for a variety of applications where precise timing and pulse generation are required. These include:
- Timing and pulse generation circuits
- Automotive systems requiring AEC-Q100 qualification
- Digital logic circuits needing retriggerable and resettable monostable multivibrators
- Systems requiring high noise immunity and low input current
- Circuits that need to interface with CMOS, NMOS, and TTL logic families
Q & A
- What is the operating voltage range of the MC74HC4538ADTR2G?
The operating voltage range is from 3.0 to 6.0 volts.
- Can the MC74HC4538ADTR2G be triggered by both positive and negative edges?
- What determines the output pulse width of the MC74HC4538ADTR2G?
The output pulse width is determined by the external timing components Rx and Cx.
- Is the MC74HC4538ADTR2G compatible with other logic families?
- What is the maximum propagation delay of the MC74HC4538ADTR2G?
The maximum propagation delay is typically 175 ns at VCC = 5V.
- Is the MC74HC4538ADTR2G suitable for automotive applications?
- What is the pulse width variation from part to part?
The pulse width variation is ±10% from part to part using the same test jig.
- Can unused inputs be left open on the MC74HC4538ADTR2G?
No, unused inputs must be tied to a high-logic voltage level or a low-logic input voltage level.
- Is the MC74HC4538ADTR2G Pb-free and RoHS compliant?
- What package types are available for the MC74HC4538ADTR2G?
