74VHC123AMX

Series:	74VHC
Packaging:	Tape & Reel (TR)
Part Status:	Active
Logic Type:	Monostable
Independent Circuits:	2
Schmitt Trigger Input:	Yes
Propagation Delay:	8.1ns
Current - Output High, Low:	8mA, 8mA
Voltage - Supply:	2V ~ 5.5V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	74VHC123

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Introduction

The 74VHC123AMX is a member of the 74VHC Logic Series of integrated circuit chips from Texas Instruments, and is part of the Multivibrators family of Logic chips. This family includes devices like oscillators, monostables, and finally, the 74VHC123AMX Duplex One-Shots. It is a dual one-shot family of highly advanced ICs, that can serve multiple applications in various industries with respect to timing or synchronization.

Applications

The 74VHC123AMX is a very versatile device in terms of its application based on its capabilities. It can be used for both a one-shot or a delay operation and each of the outputs are activated from a combination of trigger and reset conditions. This feature can be used in electronic circuits for establishing time delays, timer circuits, waveform generation and creating the basis of synchronization between digital segments in a circuit.In the industrial domain, they are used to delay a signal threading, strobing applications, where they are essential in miniature regulators or buffers, sequential logic applications, logic controllers and in switching timing applications like rate counters and waveform generators.

Features

The 74VHC123AMX is designed with dual one-shots and it is useful in creating single pulse or multiple pulses with independent control. The chips also incorporate buffer-inverter and they are designed with Schmitt-trigger input equivalents. This feature allows them to be resistant to the ringing effects of high-frequency signals. This is important in applications that use signals from oscillating sensors, because it guarantees consistent output. The chips have wide supply voltage ranges that can n range from 4.5 to 5.5 volts, and have a low power-dissipating feat. They have an input voltage range from 0.5VCC to 2VCC, and a low current absorption of 200uA max. The outputs are both sinking and sourcing, making them ideal for TTL compatibility, and the part also comes in an industry-standard DIP package, which makes it a perfect fit for most applications.

Working Principle

The 74VHC123AMX works almost the same way as a normal flip-flop with two outputs, mainly in terms of the input signals and the output signal characteristics. The output signal of the device is basically a pulse that is activated by a specific combination of the trigger and reset inputs. The peculiarity of this device is that when the trigger input is linked with the reset input, it will generate two sequential output pulses.The key is basically how the chip handles the input signals. Once the trigger input is activated, it is internally latched to enable the output. The reset input is also latched internally, serving as the reset signal for the chip. When the trigger and the reset inputs are activated simultaneously, the chip will generate the two output pulses in alternating, sequential fashion.

Conclusion

The 74VHC123AMX from Texas Instruments is a great addition to the family of Multivibrators and is able to serve multiple applications across various industries for timing or synchronization control. The use of a combination of trigger and reset inputs, wide supply voltage range and low power dissipation makes it a perfect choice for various industrial applications. Its simple working principle and low-cost make it a great fit for prototyping and redesigns.

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