CY74FCT245ATPCG4

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The CY74FCT245ATPCG4 is a high-speed logic buffer device composed of 8 non-inverting buffers. It is designed to provide high-impedance inputs and drive up to 15 low-power, TTL/CMOS loads. This device is characterized for operation over the full military temperature range of -55˚C to 125˚C. The CY74FCT245ATPCG4 is part of the Texas Instruments family of advanced FCT CMOS logic.

This logic buffer is ideal for a variety of tasks within electronic designs such as buffer isolation, fan-out, signal conditioning, data conversion, and driving other logic families. Examples of usage include connecting two logic families with different voltage requirements, translating one logic family to another, and providing isolation from line spikes.

The CY74FCT245ATPCG4 has an input range of -1V to 7.4V, and an output range of 0V to VCC. It is capable of operating at a speed of fMAX = 10 MHz, with an input capacitance of 4 pF. The propagation delay time at 4.5V is 4.5 ns typical, 6 ns maximum. The output drive strength is 8 mA, with a maximum DC output current of 25 mA.

The CY74FCT245ATPCG4 is constructed with a CMOS process technology, and offers many advantages over other logic families. The low power consumption, high speed, and small package size makes it an ideal choice for many applications. This device consumes only 145 μA of static power, and boasts a power- down mode of only 2 μA. In addition, the chip is available in several package sizes, allowing it to be adapted to fit in most design spaces.

The CY74FCT245ATPCG4 working principle is based on the fact that its input is buffered and then connected to one of its 8 outputs. Each of the 8 outputs receives three transistors—an input, an output, and a pass-transistor—which can be combined to provide either single-ended input or differential inputs. In single-ended input mode, the signal from the output to the input is amplified without any additional buffering, whereas the differential input mode, which provides improved performance with longer interconnects, requires additional buffers.

The signal is then fed to the output transistor within each output stage, resulting in an output signal with a dynamic range of 0V to VCC. If either VCC or GND is provided at the input, it is clamped within a range of -1.5V to 7.5V, and an additional buffer stage assures that the signal remains within the correct voltage range.

Due to these features, the CY74FCT245ATPCG4 is well suited for a variety of applications. Its speed and low-power operation make it ideal for driving other logic families, providing buffer isolation, and signal conditioning. Its wide input range with adjustable thresholds and its small packaging footprints make it ideal for applications such as microcontroller-based peripheral board designs where board space is at a premium.

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