74AHCT594D,118

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As one of the more complex logic circuits available, shift registers belong to the family of logic circuits known as sequential logic—logic that must keep track of the state of a system over time. Shift registers are one type of sequential logic incorporated into a wide variety of applications from toll roads to division. The 74AHCT594D is an 8-bit serial-in/serial-out parallel-out shift register, which uses an output enable (OE) feature tied to ground that enables or disables the outputs.

The 74AHCT594D has a total of 16 pins and comes in an 18-pin package. Among the 16 pins 13 are data pins, 1 is the clock (CLK) pin, 1 is the REC/LATCH pin, and 1 is the CLEAR pin. All three of these pins (CLK, REC/LATCH, and CLEAR) are active-low pins, meaning that setting these pins to a low (0V) logical level will activate the function of that particular pin. The remaining pin is the OE pin, which is active-low and is wired to ground by default.

In operation, the 74AHCT594D first receives a serial data input (SDI), which is clocked into the shift register by a low-to-high edge from the CLK pin. This data is shifted through the register bit by bit during each clock cycle. When the register is filled and the REC/LATCH pin is set low, the data is then transferred in parallel out to the outputs of the 74AHCT594D. If the OE pin is set to low and the REC/LATCH pin is set low, then the data is transferred out in parallel to ground (i.e., set to a logical 0) rather than parallel out to the outputs.

The 74AHCT594D is primarily used in applications such as modems, programmable logic controllers (PLCs), RFID readers, barcode scanners, and so on. Its high speed at 16 Mhz and high tolerances make it ideal for applications that rely on register shift technology. The 74AHCT594D contains a voltage reference that makes it desirable for applications that need the power supply of multiple logic families.

The 74AHCT594D is a shift register designed to support a wide variety of applications from low speed, low power motor control to high speed communications. It is capable of adjusting certain speed and input voltage requirements allowing the user to configure the registers to their specific application. It is particularly useful in applications that require the ability to move data beyond given limits, with the capability to output data in parallel at higher speeds than the input rate. It is also preferred in some applications because of its low power dissipation.

In summary, the 74AHCT594D is a highly versatile serial-in/serial-out parallel-out shift register. It is designed to support a wide variety of applications from motor control and communications, to data shifting and storage. Its active-low pins (CLK, REC/LATCH, and CLEAR) and OE pin make it suitable for applications that require the ability to output data in parallel at higher speeds than the input rate, and it also has a low power dissipation which makes it appealing for applications that require low power. Overall, the 74AHCT594D is an ideal form of logic circuit for a variety of applications.

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