74HCT4538DB,118

Multivibrators Overview

The Nexperia 74HCT4538DB,118 is a dual retriggerable-resettable monostable multivibrator belonging to the HCT logic family. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an ambient temperature range from -40 °C to +125 °C. The device features two independent multivibrators, each with dedicated trigger inputs (nA for HIGH-to-LOW transition, nB for LOW-to-HIGH transition) and a direct reset input (nCD). Output pulse width is determined by external timing components REXT and CEXT using the formula TW = 0.7 × REXT × CEXT. It is housed in a SOIC-16 package (SOT109-1).

Multivibrators Feature Summary

• Dual precision monostable multivibrators with separate reset inputs.
• Triggering capability from both rising and falling edges via distinct inputs.
• Schmitt-trigger action ensures tolerance to slow rise and fall times.
• CMOS low power dissipation with high noise immunity.

Multivibrators Applications

• Pulse generation and shaping circuits.
• Timing delay applications requiring precise control.
• Debouncing switches or contacts.
• Frequency division circuits.

Multivibrators Procurement Notes

Verify that the specific part number suffix matches the required package type, as the provided datasheet references the HC series while the model indicates HCT. Confirm the manufacturer designation aligns with current product specifications. Ensure the component meets the necessary environmental operating conditions for the intended application before procurement.

Multivibrators Selection Notes

Select this component when dual monostable functionality is required within standard CMOS logic systems. The HCT series ensures compatibility with TTL logic levels. Consider the external timing requirements for REXT and CEXT values to achieve desired pulse widths. Verify thermal management needs based on the specified power dissipation limits.

Multivibrators Part Context

This component is part of the 74HCT logic family, designed for high-speed CMOS operation with TTL-compatible inputs. It serves as a fundamental building block for timing and pulse generation tasks in digital electronics. The dual configuration allows for independent operation of two separate timing channels within a single integrated circuit package.

Multivibrators Replacement Considerations

Check for equivalent parts such as the 74HC4538D if HC speed characteristics are acceptable. Verify pinout compatibility and logic level requirements against alternative manufacturers' offerings. Ensure any substitute maintains the same package dimensions and electrical specifications.