MC1489AM

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MC1489AM is a single line translator, able to be used to convert the logic levels of a single line, it is created for and commonly used in interfacing between circuits which are operating at different logic levels. MC1489A part includes two identical sections, each provided with two control gates. These sections handle one data line each and enable their associated circuits to interface across barrier imposed by different logic levels. With its low power and excellent performance, it is popularly used in variety of applications.

The MC1489AM application field covers communication lines, systems that use separate supplies, motor control and logic interface. The core of its operation is based on four control gates with their input and output connected in a loop configuration. This four gates can be found with voltage control inputs A and B, input Y and output Z. As shown in the diagram the gates are connected to the input and output line in order to get the loop effective.

The working principle of MC1489AM is based on the four control gates circuit created by transistors. By adjusting the inputs A and B the loop can be opened or closed by the output of the gates. For example, if the two inputs A and B are both high, the four gates form a loop from input Y to output Z, the output level will not change from the original source of Y. However, if one of the inputs, either A or B, is low the loop will be broken. This will result to the output Z follow the state of input A or B.

The logic levels used in MC1489AM are not equivalent to the normal logic 0 and logic 1 which can vary significantly between different designs. Therefore, the logic levels of this device can be set according to the particular device which is being interfaced. The common logic levels used in this type of devices is TTL NAND gates, and can be set between 0.2V and 2V, however it all depends on the specific application.

On a more practical view, most of MC1489AM applications are related to communication lines, motor control, and logic interface with different logic levels. For example, as mentioned earlier, because the MC1489AM can be use to interface two different logic levels, specially, different levels from integrated circuits. For instance, taking advantage of the logic level translation it can be used to interface a TTL circuit with a CMOS (Complementary Metal Oxide Semiconductor) circuit.

Conclusion, the MC1489AM is a logic level translator equipped with two control gates. It is widely used for communication lines, systems with separate supplies, and interfaces between two different logic circuits. Its primary purpose is to match the logic levels that are applied from input Y to output Z and it can also be used to increase the load resistance seen at the output. These devices are mostly used when interfacing between circuits operating with different logic levels, and in and between TTL elements, such as NAND and CMOS gates.

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