74LV138PW,118

Logic switch, multiplexers, decoders are all digital circuits used to decode and route digital signals from one pathway to other. The 74LV138PW,118 is a 3-to-8 decoder/demultiplexer, which routes up to eight digital signal pathways independently. It is one of the commonly used logic signal switching elements and is widely used in electronic systems. The following content briefly introduces its application field and working principle.

The 74LV138PW,118 is suitable for a variety of application areas requiring logic signal switching and buffering. Firstly, it is commonly used for circuit boards which require many signal pathways with fewer resources. For example, a board which has multiple signals coming in, but has limited space for tracks, so it can only use a single track cable, then use 3-to-8 decoder/demultiplexer can route these signals to different pathways, thus save space and unnecessary routing. Secondly, the 74LV138PW,118 can be used as a buffer to improve signal strength. For example, when connecting a signal pathway to a long distance, the signal strength will be greatly weakened, which brings difficulty in signal transferring. The 74LV138PW,118 can be used as a buffer to amplify the signal, make the signal stronger, and thus improve the signal transfer. Thirdly, the 74LV138PW,118 is used for communication interface and logic controlling. With three lines of input and eight lines of output, it can route the input signals to multiple outputs independently, and thus be applied to many communication and logic control scenarios, such as TV remote control, home security system, computer communication interface, etc.

The 74LV138PW,118 consists of three independent decoders and has eleven input/output pins. It is activated by the two enable pins EN1, EN2. When EN1, EN2 are both high enable, the decoder is active. The three select pins A1, A2 and A3 are used as the decoding input and combined according to Boolean algebra to decode up to 8 addresses from the input ports. The data pins D0, D1 and D2 are used as the data input and combined according to boolean algebra to select up to 8 address from the output ports. The active-low output enable (OE1, OE2) pins is used to control the state of the outputs. When OE1, OE2 goes high, all output ports are disabled, when OE1, OE2 goes low, all outputs are enabled.

The 74LV138PW,118 can be used as a 3-bit decoder when EN1, EN2, OE1 and OE2 is grounded. Inputs of A1, A2, A3 will select corresponding outputs D0, D1 and D2. Thus, the 74LV138PW,118 can be used as a 3-bit decoder. Besides, the 74LV138PW,118 can decode multiple addresses simultaneously and in order, which makes the 74LV138PW,118 suitable for applications where several addresses need to be decoded from a single address port. For example, when a bus address is decoded from the input address, the 74LV138PW,118 can decode several addresses in one operation and route them to the designated output port.

In conclusion, the 74LV138PW,118 is a 3-to-8 decoder/demultiplexer, which has many application areas, such as logic signal switching, buffering, communication interface, etc. Its 11 pins are used for the data input, data output and the enable. Its 3 select pins and 8 data pins can decode multiple addresses simultaneously and in order, making it suitable for various address decoders.