MC74HC4538AFR2-MO

Multivibrators Overview

The MC74HC4538AFR2 is a dual retriggerable precision monostable multivibrator fabricated in advanced silicon-gate CMOS technology. It provides two independent one-shot circuits, each featuring negative (A) and positive (B) transition triggered inputs that can also function as inhibit inputs. A dedicated clear input resets the device when taken low. The circuitry ensures pulse width stability across wide temperature and supply voltage ranges using linear CMOS techniques. The output pulse width is determined by external resistor and capacitor values.

Multivibrators Feature Summary

• Dual retriggerable monostable multivibrator architecture
• Negative and positive edge-triggered inputs with inhibit capability
• High noise immunity and low power consumption characteristics
• Pin and function compatible with standard CD4538 devices

Multivibrators Applications

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

Multivibrators Procurement Notes

Verify the specific suffix 'FR2' against the manufacturer's current datasheet to confirm package type and tape-and-reel specifications. Ensure the operating voltage range matches system requirements, typically 2V to 6V for HC logic. Confirm RoHS compliance status if required by assembly standards. Cross-reference the manufacturer code 'MO' with Motorola or its successor entities to validate authenticity and sourcing channel reliability.

Multivibrators Selection Notes

Select this component when dual independent timing channels are required in a compact CMOS package. It is suitable for designs needing high noise immunity and low standby power compared to TTL alternatives. Verify that the external RC components selected provide the necessary pulse width stability over the intended operating temperature range. Ensure input trigger signals meet the specified voltage thresholds for reliable operation.

Multivibrators Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices. It is functionally equivalent to the MM74HC4538 and other industry-standard variants like the NXP or STMicroelectronics versions. The device implements silicon-gate CMOS technology to achieve performance comparable to low-power Schottky TTL while maintaining CMOS advantages. It is widely used in digital systems requiring precise timing functions.

Multivibrators Replacement Considerations

Direct pin-compatible substitutes include the MM74HC4538, SN74HC4538, and MC14538B. Verify electrical parameters such as propagation delay and supply current limits before substitution. Ensure the alternative device supports the same retriggerable functionality and input trigger polarities.