MC14538BF

Multivibrators Overview

The MC14538BF is a dual precision retriggerable and resettable monostable multivibrator manufactured by onsemi. It operates within a DC supply voltage range of 3.0 V to 18 V and supports an operating temperature range from -55 °C to +125 °C. The device generates accurate output pulses with widths ranging from 10 μs to 10 s, determined by external timing components RX and CX. It features latched trigger inputs capable of triggering from positive (A input) or negative-going edges (B input), along with separate latched reset inputs.

Multivibrators Feature Summary

• Dual precision monostable multivibrator architecture with independent timing control for each channel
• Latched trigger inputs allowing flexible edge selection via A or B inputs
• Separate latched reset inputs for immediate pulse termination
• Capable of driving two low-power TTL loads or one low-power Schottky TTL load

Multivibrators Applications

• Pulse width generation and shaping in digital circuits
• Timing delay circuits requiring precise duration control
• Frequency division and counting applications
• Reset signal generation for sequential logic systems

Multivibrators Procurement Notes

Verify the specific suffix BF corresponds to the SOEIAJ-16 package configuration as listed in the ordering information. Confirm that the component meets RoHS compliance standards and lead-free requirements specified by the manufacturer. Ensure the procurement source provides valid traceability documentation for the assembly location and wafer lot codes indicated on the marking diagram.

Multivibrators Selection Notes

Select this component when designs require wide pulse width ranges up to 10 seconds with high accuracy. Consider its pin-for-pin compatibility with MC14528B and CD4528B if upgrading existing designs. Use this part over HC variants when operation below 10 μs is not required or when supplies exceed 6 V. Evaluate the need for retriggerable functionality versus non-retriggerable alternatives based on system timing requirements.

Multivibrators Part Context

This device belongs to the MC145xx series of CMOS logic functions produced by onsemi. It serves as a precision timing element within the broader family of monostable multivibrators. The MC14538B variant is distinguished by its ability to handle both rising and falling edge triggers independently while maintaining latch states for reliable operation in noisy environments.

Multivibrators Replacement Considerations

The MC14538BF is pin-for-pin compatible with the MC14528B and CD4528B (CD4098). These parts can be substituted directly without circuit modification provided their electrical specifications meet the design constraints.

Multivibrators FAQ

How is the output pulse width determined?

The output pulse width is determined by the values of the external timing resistor (RX) and capacitor (CX) connected to the device.

Can the device be triggered by both rising and falling edges?

Yes, the device allows triggering from the positive edge via the A input or the negative-going edge via the B input.

What is the maximum supply voltage?

The maximum DC supply voltage (VDD) for the MC14538BF is 18.0 V.