HCF4538BEY

Multivibrators Overview

The HCF4538BEY is a dual precision monostable multivibrator fabricated in Metal Oxide Semiconductor technology, available in a 16-DIP package. It provides stable retriggerable and resettable one-shot operation for fixed voltage timing applications. The circuit utilizes an external resistor (RX) and capacitor (CX) to control timing accuracy, with pulse width calculated as T = RX CX. Trigger propagation delays are independent of the external RC components. The device supports supply voltages from 3V to 20V and operates within a temperature range of -55°C to +125°C.

Multivibrators Feature Summary

• Retriggerable and resettable capability allows output pulse extension or immediate termination via dedicated inputs.
• Schmitt trigger inputs enable unlimited rise and fall times on triggering signals.
• Separate reset inputs provide direct low-level control over output pulses.
• Buffered Q and complementary Q outputs are available for driving subsequent stages.

Multivibrators Applications

• Fixed voltage timing circuits
• Pulse generation systems
• Timing delay applications

Multivibrators Procurement Notes

Verify component authenticity through authorized channels due to discontinued status. Confirm RoHS3 compliance and check for equivalent replacement parts from other manufacturers if new production units are required. Ensure packaging integrity matches DIP-16 specifications during receipt inspection.

Multivibrators Selection Notes

Select this component when dual independent monostable circuits are needed in a single package. Consider the wide operating voltage range and Schmitt trigger inputs for noise immunity. Verify that external RC values meet minimum resistance and capacitance limits for proper operation.

Multivibrators Part Context

This part belongs to the HCF4538B series of dual monostable multivibrators. It is manufactured by STMicroelectronics using CMOS technology. The 'EY' suffix indicates the specific 16-pin DIP package configuration. The device meets JEDEC JESD13B standard specifications for B Series CMOS devices.

Multivibrators Replacement Considerations

Texas Instruments CD14538BE is listed as a similar alternative part number for this discontinued component.

Multivibrators FAQ

How is non-retriggerable mode configured?

Connect the complementary output (Q-bar) to the negative trigger input (-TR) when using leading edge triggering (+TR), or connect the positive output (Q) to the positive trigger input (+TR) when using trailing edge triggering (-TR).

What are the minimum external component values?

The minimum value for the external resistance (RX) is 4KΩ, and the minimum value for the external capacitance (CX) is 5nF.