74VHC238MTR

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Logic – Signal Switches, Multiplexers, Decoders are very common in modern day circuits, as they provide structure and additional “smartness” to different types of circuits. Among them, the 74VHC238MTR is one such device, used for a variety of applications, while working on the principles of comination logic.

Introduction

74VHC238MTR is a 3-to-8 line decoder and multiplexer device, available in the industry standard ultra-small TSOP package. It has three select pins (A0, A1, A2) through which the user can select any one of the eight lines (outputs) as the data input, while the other seven lines can be used together as an 8-bit bus. This device offers a total of eight non-inverting outputs, all of which can be enabled by a single output enable (OE) pin.

Application Field

The 74VHC238MTR can be used for various applications like memory decoding, demultiplexing, address decoding and in a wide range of digital implementations, both in industrial and domestic circuits. Because of its small size, it can be used in applications where board space is limited. For example, this device can be used in the design of a two wire doorbell circuit, whereby the two doorbells (the transmitter and receiver pieces) can be easily identified, by decoding the address bits, hence triggering the desired output from the decoder.

Working Principle

The 74VHC238MTR utilizes 74VHC logic technology to facilitate the decoder and multiplexer application, with a single chip. Basically, the select lines (A0, A1, A2) are read by the device, which then drives the desired output of the multiplexer, based on the combination of the select lines. The working principle of this device relies heavily upon the combinational logic operations like OR, AND, XOR. As an example, if user wants to select the fourth output of the device, then he must trigger all the three select signals (A0, A1, A2) to logic LOW simultaneously.

The 74VHC238MTR can interpret different combinations of the three select inputs (A0-A2) as a binary code, which is basically a binary address used to point to a specific output line. For example, if A0 = 0, A1 = 1, and A2 = 0 , then the binary code will be 010 (binary representation of 2 in Decimal system). This code will point to the 2nd output line of the device.

Conclusion

The 74VHC238MTR is ideal for applications requiring small size, low power and multiplexing/decoding capability. It is a very reliable and efficient device, taking in 3 bits of input and giving out 8 bits of output, with a single chip. Besides, the address decoding logic used by this device makes it even more advantageous for use with a wide array of disparate digital systems.

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