MM74HC138SJ

The MM74HC138SJ is a logic-signal switch made with high-speed CMOS technology. It is used to decode three binary address inputs into eight mutually exclusive outputs. This allows for a wide range of applications, from low-speed to high-speed systems.

The MM74HC138SJ operates in two modes: active-low and active-high. In active-low mode, the output is LOW when the binary address inputs are valid. After a LOW to HIGH transition on the enable input (E), the associated output will go LOW. Similarly, in active-high mode, the output is HIGH when the binary address inputs are valid. After a HIGH to LOW transition on the enable input (E), the associated output will go HIGH.

In addition to its two operating modes, the MM74HC138SJ also offers a "no-decode" operation, which is handy when you want to directly control the output without decoding it. In this mode, the output is not enabled or disabled by the binary address inputs. Instead, the output is enabled or disabled by the enable input only.

The MM74HC138SJ is typically used in systems that need to transfer data between multiple points or perform multiplexing operations. It is also used in systems that require decoding or buffering of digital signals. The MM74HC138SJ is ideal for applications where speed, power consumption, and space requirements are critical.

The MM74HC138SJ is designed to be powered by a single +5V supply, with a maximum output current at any output of 24 mA. It has a wide operating temperature range of -55°C to 125°C and a low-power dissipation. It has an individually programmable enable input, and it is also fully static (meaning that no clock is required).

The MM74HC138SJ is available in a 16-pin dual-in-line plastic package and is designed to be easy to use. All eight outputs can be enabled independently of one another and have a Schmitt-trigger input buffer to improve noise immunity. It also features over-voltage and over-current protection.

In summary, the MM74HC138SJ is a reliable and cost-effective logic-signal switch that is suitable for a wide range of applications. It offers two different operating modes, a "no-decode" operation, and a wide operating temperature range. It is also easy to use and features individual programmable enable input, over-voltage and over-current protection, and a Schmitt-trigger input buffer to improve noise immunity.