MC74HC393ADR2G

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The MC74HC393ADR2G is a logic-based “ oscillator-divider ” counter with a built-in D flip-flop and clock oscillator circuit. The MC74HC393ADR2G is particularly useful for applications like night lighting and the pulse-width-modulation (PWM) of motor speed.

Application Fields

The MC74HC393ADR2G is typically used to count from 0 to 15 in cyclical manner and divides the periodic counters by two, four and eight etc. The counter is ideal for use in applications like night lighting, touch sensing, security systems, toy controls, robot controls, PWM motor speed control and washing machine controls.

The MC74HC393ADR2G can also be used to generate square waves. Its oscillator can be externally connected by two resistors and capacitor, which can control the frequency outputted by the counter. Thus, the output of the counter can be used to produce square waveforms with regular frequency intervals.

Working Principle

The MC74HC393ADR2G is essentially a 16-stage binary counter with an extra stage dedicated to the clock oscillator. The counter is integrated with a D flip-flop circuit, which has two inputs: the clock input that shifts the contents of the counter, and the trigger input that can be enabled to immediately update the counter. The stored count is then used to drive the outputs.

The 16 outputs of the counter are configured to produce Gray codes, which is the representation of a binary number in which each successive value is represented by a single bit change. This type of representation can be useful in applications requiring more precise digital control, such as decoding numeric displays or encoders.

The MC74HC393ADR2G also features two digital inputs, OE (output enable) and N (reset). The OE input allows the outputs to be enabled and disabled, while the N input when provided with a low logic (logic “0”) resets all the outputs to “0” to help ensure the accuracy of the outputs.

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