SN74ACT14DBR Integrated Circuits (ICs)

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Logic gates and inverters are important components for many electronic device designs. In this article, we will discuss the application field and working principle of the SN74ACT14DBR, a hex inverter with schmitt-trigger inputs.

SN74ACT14DBR, designed and manufactured by Texas Instruments, is a hex inverter with Schmitt-trigger inputs. It provides the ability to invert six separate isolated digital signals, each capable of handling logic input and output levels between -40V and +40V typically, withstood up to 70V and with a guaranteed logic high input voltage of 2V minimum at 24°C.

The Schmitt-trigger inputs add hysteresis to every circuit: when the upper threshold of the inputs is crossed a logical 1 is generated, and when the lower threshold is crossed a logical 0 is generated. This makes the circuit immune to noise and helps provide more reliable operation in noisy environments.

SN74ACT14DBR can be used in many application fields, including ancillary circuits for peripheral controllers, keyboards/keypads and LCD drivers, isolating and buffering circuits for memory and data buses and AC/DC control circuits, pulse counters and pulse fan-out circuits, buses receivers and transceivers, encoders, multiplexers and decoders, oscillators and temperature compensation circuits, shift registers, and frequency dividers.

SN74ACT14DBR has conservation of charge characteristics over all parameters, resulting in excellent power dissipation versus frequency characteristics, and a low 70nA total ICC supply current with a flexible power-on reset feature. It features fast switching, with a maximum propagation delay of 8.5ns, as well as low-voltage (2V) Schmitt-trigger inputs and inverted CMOS outputs.

The working principle of SN74ACT14DBR is based on the P-type mosfet and N-type mosfet logic gates. P-type mosfet logic gates are composed of an N-type mosfet connected to the gate output of a P-type mosfet. When the gate output of the P-type mosfet is high, the N-type mosfet is off. Conversely, when the gate output is low, the N-type mosfet is on. The P-type mosfet serves to invert the input signal and the N-type mosfet serves to block the passage of excess current.

The Schmitt Trigger action of the SN74ACT14DBR helps produce a clean, accurate digital signal. It works by splitting the logic range in half with the upper and lower thresholds, such that input signals that exceed either threshold will be inverted. For example, input signals that exceed the upper threshold will produce a low output signal, while those that exceed the lower threshold will produce a high output signal. This helps to eliminate any noise or electrical interference that may affect the digital signal.

In summary, the SN74ACT14DBR is a hex inverter with Schmitt-trigger inputs, capable of handling logic input and output levels of -40V and +40V. It is suitable for many application fields, including peripheral controller ancillary circuits, LCD drivers, data buses and AC/DC control circuits, pulse counters, multiplexers and oscillators. Its working principle is based on the P-type mosfet and N-type mosfet logic gates, which provides the ability to invert input signals and block the passage of excess current. The Schmitt Trigger action of the SN74ACT14DBR helps to eliminate noise and electrical interference, ensuring accurate digital signal.

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