SN74AHC123ADR

Overview

The SN74AHC123ADR is a dual retriggerable monostable multivibrator from the Texas Instruments AHC logic series, housed in a 16-pin SOIC package. It operates within a supply voltage range of 2V to 5.5V and supports an operating temperature range of -40°C to +85°C. The device features Schmitt-trigger circuitry on inputs A, B, and CLR to accommodate slow input transition rates. Propagation delays are specified at 24ns for VCC = 3.3V and 14ns for VCC = 5V under standard load conditions.

Feature Summary

• Dual retriggerable monostable multivibrators designed for extended output pulse generation
• Schmitt-trigger inputs provide jitter-free triggering with slow input transition rates
• Edge-triggered operation from active-high or active-low gated logic inputs
• Glitch-free power-up reset ensures outputs remain in defined states during initialization

Applications

• Pulse width modulation circuits
• Timing delay generation
• Frequency division applications
• Debouncing switches

Procurement Notes

Verify the specific ordering suffix 'ADR' corresponds to the SOIC-16 package and tape-and-reel carrier configuration. Confirm that the component meets RoHS compliance standards and Lead (Sn) finish requirements as indicated in the manufacturer's packaging data sheet. Ensure the selected variant matches the required industrial temperature range specifications.

Selection Notes

Select this component when dual independent timing channels are required within a single integrated circuit. The AHC series offers high-speed performance suitable for modern digital systems while maintaining compatibility with standard CMOS logic levels. Verify that external timing components can support the desired pulse duration calculations based on the provided resistance and capacitance formulas.

Part Context

This device belongs to the SNx4AHC123A family of dual retriggerable monostable multivibrators. It shares functional characteristics with other members of the AHC logic family, offering low power consumption and wide supply voltage operation. The 'D' suffix indicates the SOIC package style, while 'R' denotes the reel packaging format for automated assembly processes.

Replacement Considerations

SN74AHC123ADBR

FAQ

How does the retriggerable feature affect the output pulse duration?

Once triggered, the basic pulse duration can be extended by applying additional trigger signals to the gated inputs before the initial pulse expires.

What is the function of the CLR input?

The clear input overrides the trigger inputs and terminates the output pulse early if driven low during the output state.