CD74HCT123E

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The CD74HCT123E is a high-speed CMOS Dual Retriggerable Mono Multivibrator with Schmitt triggers. It is a dual monostable multivibrator with Schmitt trigger inputs and asymmetrical output on each stage. The device is specifically designed to produce precise timing pulses or create oscillations at frequencies up to a few hundred kHz.

The CD74HCT123E is manufactured from high-speed CMOS technology and designed to be used in high-voltage environments, making it more suitable for a wide range of applications. The device can be found in numerous products, including alarm systems, home-appliance control, security systems, look-up tables and timekeeping clocks.

Application Field

The application field of CD74HCT123E includes:

• Alarm systems
• Home-appliance control
• Security systems
• Look-up tables
• Timekeeping clocks
• Data acquisition systems
• Motion control systems

Working Principle

The CD74HCT123E is a dual monostable multivibrator with Schmitt trigger inputs and symmetrical outputs on each stage. It takes in two rectangular waveforms and uses the difference between the two waveforms to trigger its output. The pulse duration or delay is determined by a variable resistor or capacitor. The CD74HCT123E consists of two identical circuits, each composed of two inverters, a Schmitt trigger and a transmitting Schmitt trigger. The Schmitt trigger compares the input signal with its reference voltage, and transfers the voltage change to the output with hysteresis.

When a pulse is applied to the input of one of the two stages, that stage begins to provide its output signal. When the pulse at the input of the other stage reaches the opposite transition point, the opposite output is triggered and the cycle is repeated. The two stages are triggered independently, giving a pulse width determined by the differential input. The symmetrical outputs can provide a pulse width which is very low in comparison to the input signal waveform.

The CD74HCT123E also has logic control inputs which can be used to control the retriggering of the output. The device can be used in either a toggle or astable mode of operation. In astable mode, the outputs are continually triggered and the frequency is set by the internal circuit components. In toggle mode, the output is triggered once, and then retriggered by an external signal. This allows the signal to be used in applications which require pulsed signals at predetermined times.

The CD74HCT123E is a versatile device which can be used in a wide range of applications. It is especially useful in areas where a precise output pulse is needed, such as data acquisition systems, motion control systems and security systems.

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