MM74HC4538SJ

Overview

The MM74HC4538SJ is a dual retriggerable precision monostable multivibrator implemented in advanced silicon-gate CMOS technology. It features Schmitt trigger inputs for both positive and negative transitions, with a dedicated clear input to reset the output. The device operates within a supply voltage range of 2V to 6V and supports an operating temperature range from -40°C to +85°C. It utilizes external resistors and capacitors to set pulse widths according to the equation PW = 0.7(R)(C). The SOP-16 package provides pin compatibility with CD4528 and CD4538 devices.

Feature Summary

• Dual retriggerable monostable multivibrator architecture
• Schmitt trigger inputs for noise immunity
• Linear CMOS techniques for pulse width stability
• Static discharge protection on all inputs

Applications

• Pulse generation circuits
• Timing delay applications
• Debouncing switches
• Frequency division

Procurement Notes

Verify component authenticity through authorized channels as this part number may be subject to obsolescence or limited availability. Confirm that the specific SOP-16 package variant matches the required footprint for PCB integration. Ensure environmental specifications align with operational requirements before procurement.

Selection Notes

Select this component when precise timing control is required using external RC networks. The dual configuration allows independent operation of two timers within a single package. Verify that the input signal transition times fall within specified limits to ensure reliable triggering and accurate pulse width generation.

Part Context

This device belongs to the HC logic family, offering speeds comparable to low power Schottky TTL while maintaining CMOS low power characteristics. It is designed for general-purpose digital applications requiring reliable monostable operation with high noise immunity and wide supply voltage tolerance.

Replacement Considerations

The MM74HC4538SJ is pin compatible with the CD4528 and CD4538 devices. These alternatives can be considered for direct replacement if electrical characteristics meet system requirements.