CD54HC123F

Multivibrators Overview

The CD54HC123F is a high-speed CMOS logic dual retriggerable monostable multivibrator with resets, manufactured by Texas Instruments. It operates within a supply voltage range of 2V to 6V and supports an operating temperature range from -55°C to 125°C. The device features Schmitt triggers on both A and B inputs for pulse triggering at specific voltage levels independent of rise and fall times. Timing is controlled by external resistor (Rx) and capacitor (Cx), allowing wide output pulse width adjustments. It provides separate resets and can be triggered by negative-to-positive reset pulses.

Multivibrators Feature Summary

• Dual retriggerable monostable multivibrators with overriding reset functionality that terminates output pulses
• Schmitt trigger inputs on both A and B terminals enabling edge-independent pulse triggering
• Buffered Q and Q outputs providing standard or bus driver fanout capabilities
• Wide operating temperature range suitable for demanding environmental conditions

Multivibrators Applications

• Pulse generation and timing circuits requiring adjustable duration
• Debouncing switches or contacts in digital systems
• Frequency division and pulse stretching applications
• Timing delays in sequential logic control systems

Multivibrators Procurement Notes

Verify the complete part number including suffixes such as F3A when ordering to ensure correct package and military-grade specifications. Confirm RoHS compliance status and lead finish options like SNPB or NIPDAU based on assembly requirements. Check active production status versus obsolete listings for alternative packages. Ensure proper electrostatic discharge handling procedures are followed during storage and installation.

Multivibrators Selection Notes

Select this component for designs requiring dual independent monostable circuits with reset capability. Choose HC types for broader voltage operation between 2V and 6V. Consider HCT variants if direct LSTTL input compatibility is necessary. Verify external Rx and Cx values meet minimum resistance and capacitance limits for accurate timing. Evaluate thermal impedance and power dissipation characteristics for the chosen package type.

Multivibrators Part Context

This device belongs to the CD54/74HC123 family of high-speed CMOS logic components. It is distinct from the CD74HC423 series which lacks the negative-to-positive reset pulse triggering feature. The CD54 prefix indicates military-grade qualification, while the 'F' suffix denotes a ceramic dual in-line package. It serves as a foundational timing element in complex digital architectures.

Multivibrators Replacement Considerations

CD54HCT123F3A offers compatible functionality with HCT input logic levels. CD74HC123 variants provide catalog equivalents in different packaging formats. Cross-reference pinouts and electrical specifications carefully when substituting devices from other manufacturers.