SN74AHCT125N

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The SN74AHCT125N is a quad-buffer gate that provides a 1:4 voltage-level transformation with low input-output capacitance. It is a low-power, standard logic device organized as four non-inverting buffers. With its low input-output capacitance and wide common-mode voltage range, this device is optimized for 1.65 to 5.5V VCC operations and is ideal for applications driven by slower logic families. It is designed to drive bus-oriented systems based on multiple-transistor logic (MTL), designed for five-volt VCC, and providing active-low outputs.

The SN74AHCT125N has four buffering stages that can interface to many different kinds of logic families. Each buffering stage consists of three basic elements: inverter, tunnel diode, and capacitor. The inverter is a logic circuit the converts an input logic level to its complementary output level. The tunnel diode limits the output voltage swing of the inverter and acts as a current limiter. The capacitor is connected across the output of the buffering stage and provides additional current-limiting protection to the gate output.

The SN74AHCT125N has an output enable (OE) pin, which can be used to simultaneously disable all output buffers. When OE is low, the buffer outputs are in high-z (high-impedance) state and will not drive the bus-lines. The OE pin has an internal pull-up resistor, which when left unconnected will tie the output enable high, making the output buffers enabled. This device features input protection for voltages up to 5.5V. It has low input-output capacitance, which keeps the total device gate count low. Also, it has a wide VCC operating range and is capable of driving bus-lines over long distances.

In general, the SN74AHCT125N is a versatile quad-buffer gate with a wide number of applications. It can be used in applications requiring high input-output capacitance, data transmission over long distances, voltage-level transformations, and active-low outputs. Also, this quad-buffer gate is ideal for driving MTL-based systems and circuits with slower logic families. With its low input-output capacitance and wide common-mode voltage range, this device can be optimized for up to 5.5V VCC operations.

The primary applications for the SN74AHCT125N are bus applications, where multiple drivers are needed to drive multiple-transistor logic (MTL), designed for five-volt VCC, and providing active-low outputs. This device can also be used in applications that require high input-output capacitance, data transmission over long distances, and voltage-level transformations. Furthermore, it can be used for systems requiring low power dissipation and wide common-mode voltage range. The SN74AHCT125N is also ideal for driving bus-lines based on slower logic families.

The working principle of the SN74AHCT125N is fairly simple. It is organized as four non-inverting buffers which feature an output enable pin that can be used to disable all the output buffers. This device contains an internal pull-up resistor, which when left unconnected will tie the output enable high, making the output buffers enabled. The SN74AHCT125N also features input protection for voltages up to 5.5V and can be used to drive bus-lines over long distances or systems with slower logic families. Finally, it has a low input-output capacitance that helps reduce the total device gate count low.

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