74VHC157SJ

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What is 74VHC157SJ?

74VHC157SJ is a Quad 2-Input Multiplexer/Demultiplexer with Dual 4-Bit Addressable Storage Flip-Flop type logic-signal switch. It is manufactured by Texas Instruments in a 16-pin wide-body plastic package. It allows you to select one of four binary inputs based on the address signals it receives.

Application Field

The 74VHC157SJ is well-suited for select applications. It can be used to select between four data inputs in applications related to memory addressing, logic circuits, and data bus connections. It is also suitable for applications with limited logic control, such as embedded systems and in portable electronics.

Another common application is in communication networks, such as Ethernet networks. Here, the multiplexer can be used to connect multiple devices to the same channel, thereby increasing data throughput. Similarly, the 74VHC157SJ can be used to switch between multiple telecommunication channels.

Working Principle

The 74VHC157SJ comprises four 2-Input multiplexers. Each multiplexer has two data inputs, A & B, and a selection input, S. The multiplexer outputs the data from the input (A or B) that corresponds to the logical state of the selection input (S), i.e. 0 for A and 1 for B. The selection input is provided by two 4-bit addressable storage flip-flops that are used to control the multiplexers.

The flip-flops store a 4-bit address which is used to control the selection inputs S for each of the multiplexers. The 4-bit address is provided by input pins S0 to S3. These can be driven by a 4-bit binary address, or by an external clock. In either case, each multiplexer is switched when the address at the input pins matches the stored address.

The 74VHC157SJ multiplexer/demultiplexer can also be used in serial data communication, where it can be used to switch between serial and parallel data transmission. In this case, the flip-flops are used to store the data to be transmitted and the selection inputs are used to select which data is to be transmitted.

The 74VHC157SJ can also be used in multiplexing and demultiplexing applications to switch between multiple inputs and/or outputs. In this case, the two flip-flops store the address of the input/output to be switched and the selection inputs are used to switch between the desired input/output.

In addition to these applications, the 74VHC157SJ can also be used in power control systems and digital logic circuits, where it can be utilize to control the switching of multiple devices.

Overall, the 74VHC157SJ is an easy to use multiplexer/demultiplexer that is well suited for a wide range of applications.

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