MM74HC123AMTCX

Overview

The MM74HC123AMTCX is a dual retriggerable monostable multivibrator manufactured by onsemi, utilizing advanced silicon-gate CMOS technology. It operates within a supply voltage range of 2V to 6V and features a typical propagation delay of 25 ns. The device includes Schmitt trigger inputs for slow rise/fall times and offers low quiescent current. It is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP).

Feature Summary

• Dual retriggerable monostable multivibrator design with independent timing circuits.
• Schmitt trigger A and B inputs accommodate slow signal transitions.
• Retriggering capability extends output pulse width upon subsequent valid triggers.
• Low power consumption with high noise immunity characteristic of CMOS logic.

Applications

• Pulse generation and shaping circuits.
• Timing delays and time-base generation.
• Debouncing switches or contacts.

Procurement Notes

Verify the specific package type and manufacturer documentation when sourcing. Confirm that the component matches the required operating temperature range and electrical specifications for the intended application environment before finalizing procurement decisions.

Selection Notes

Select this component for applications requiring precise timing intervals generated via external RC networks. Ensure the external resistor and capacitor values fall within the recommended operating conditions to maintain pulse width stability across the specified temperature and voltage ranges.

Part Context

This part belongs to the MM74HC123A series of dual monostable multivibrators. It is functionally compatible with standard 74LS logic families while offering improved power efficiency. The 'MTC' suffix indicates the TSSOP package variant, suitable for surface-mount assembly.

Replacement Considerations

Direct substitutes include other dual monostable multivibrators from the 74HC123 family. Verify pinout compatibility and electrical characteristics such as propagation delay and supply voltage limits when considering alternative manufacturers.

FAQ

How is the output pulse width determined?

The output pulse width is determined by the external timing resistor (REXT) and capacitor (CEXT) connected to the device, following the formula PW = REXT * CEXT.

Can the device be reset during operation?

Yes, the device can be reset at any time by applying a low level to the Clear input, which forces the output to its quiescent state.