CD74HCT4538E

Multivibrators Overview

The CD74HCT4538E is a dual retriggerable precision monostable multivibrator manufactured by Harris Corporation. It belongs to the 74HCT logic series and operates within a supply voltage range of 4.5 V to 5.5 V. The device features two independent circuits in a 16-pin DIP package, with a typical propagation delay of 21 ns at 5 V. It supports Schmitt trigger inputs for noise immunity and includes separate reset inputs. The component is rated for operation between -55 °C and +125 °C.

Multivibrators Feature Summary

• Dual retriggerable precision monostable multivibrator architecture
• Schmitt trigger inputs on both positive and negative transition triggers
• Separate reset input for each circuit
• CMOS technology compatible with low power Schottky TTL speeds

Multivibrators Applications

• Pulse width modulation generation
• Timing delay circuits
• Frequency division
• Waveform shaping

Multivibrators Procurement Notes

Verify the manufacturer designation as Harris Corporation or its successor entities, as production rights for legacy 74-series logic have transferred over time. Confirm the specific suffix 'E' corresponds to the intended plastic DIP package variant. Check RoHS compliance status, as older Harris-branded components may not meet current environmental directives compared to modern equivalents from Nexperia or Texas Instruments.

Multivibrators Selection Notes

Select this component when a dual monostable configuration is required with HCT logic level compatibility. Ensure the design accommodates the 4.5 V to 5.5 V supply voltage constraint. Consider the 21 ns propagation delay for timing accuracy requirements. Verify that the DIP-16 package fits the available PCB footprint and assembly constraints.

Multivibrators Part Context

This part is part of the 74HCT4538 family, which provides dual monostable multivibrators. While originally associated with Harris Corporation, similar devices are now commonly produced by manufacturers like Nexperia and Texas Instruments under the same JEDEC standard specifications. The device serves as a digital timer capable of generating precise output pulses triggered by external signals.

Multivibrators Replacement Considerations

• CD74HCT4538M (Texas Instruments)
• 74HCT4538D (Nexperia)