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Logic - Flip Flops

The SN74AS4374BDWE4, or the Texas Instruments\' Quad D-Type Flip-Flop with Synchronous Clear, is a 4-bit digital storage device with three independent asynchronous controls. It functions as a clocked storage register, and its primary role is to store and forward digital information during a sequential data manipulation process. The SN74AS4374BDWE4 is an enduring alternative to shift registers and counters in applications that are time-sensitive, such as in Secure Digital (SD) and MultiMediaCard (MMC) protocols. This article will focus on the applications and the working principles of the SN74AS4374BDWE4.

Applications

The SN74AS4374BDWE4 is a dynamic alternative to shift registers and counters, allowing for small size and low-power requirements, as it can independently control two external loads with two data ports. This capability allows for the SN74AS4374BDWE4 to be implemented in power-sensitive applications such as secure digital (SD) or multimedia card (MMC) protocols. This makes it useful in communications systems, as it can be employed in multimedia encryption and coding. Moreover, it can also be applied in peripheral components such as modems, wired communications, and cellular phones.

Although this IC was not primarily designed for bus applications, the SN74AS4374BDWE4 can be reconfigured as a shift register, making it a viable replacement to shift registers and counters. As it has two data outputs, it can be used to capture data and forward it in systems that require high-speed transmission. It can also be used as a storage register ROM connected to a microcontroller, as it offers low power and a small size, in addition to its high-speed capability.

Working Principles

The SN74AS4374BDWE4 is an integrated circuit comprised of four D type flip-flops and three asynchronous external controls (CE, CLE, CLR). It is fabricated for 2.7 V to 3.6V operation and it has an output stage designed for driving an external load at 1V. Its schematic signifies that each flip-flop consists of two-gated D type US (Universal Switch) transistors and two gated D type RS (Ready Set) transistors.

The SN74AS4374BDWE4 is generally used as a clocked storage register, where different clock signals are used to feed the state information and control of storage, input, and output sections. The clock input provides a clocking signal, while the CLE (Clock Enable) input is synchronized with the clock and enables the data to propagate through the data inputs of the flip-flops. The CLR (Clear) input clears the outputs and returns them to logic low.

When the SN74AS4374BDWE4 is working as a shift register, the clock period is chosen so that it is slightly longer than the delay between the CK and DI inputs. This ensures that the data bits are fully switched in or out of the IC. The device can be designed to shift the data from left to right or from right to left. During the shifting process, the data detected at the DI input is clocked into the flip-flop, and the data previously latched in the output is shifted to the next output.

In conclusion, the SN74AS4374BDWE4 is a 4-bit digital storage device, with three independent asynchronous controls. It is ideal for low-power applications that require high-speed transmission, such as peripheral components and multimedia encryption and coding. This integrated circuit consists of four D type flip-flops and is designed to operate with a 2.7V to 3.6V power supply. It can be used as a clocked storage register or as a shift register, depending on the clock period chosen for its operation.

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