DM74AS258N

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DM74AS258N is a logic-signal switch, multiplexer, and decoder commonly used in electronics circuits. This part is an 8-bit wide, CMOS device of the same family as the DM74AS157N. It is designed to provide fast switching speeds and high noise immunity making it suitable for use in a variety of electronic applications.

The DM74AS258N is capable of switching and multiplexing logic signals and can be configured in a number of different ways. It is commonly used as an 8-bit wide two-to-one multiplexer/decoder, allowing eight different input signals to be multiplexed into a single output. The device can also be used as a 1-to-8 decoder and four independent 1-to-4 multiplexers.

The DM74AS258N operates off of a single power supply and is available in a range of different packages, including DIP and SOIC. The device uses logic low enable signals and the outputs are three-state, having high-impedance when the enable inputs are low.

The DM74AS258N chip consists of two separate sections. The first section is the multiplexer/decoder and the second section is the single-bit latch. On power up, the latch section is normally in the reset state. In this state, the outputs remain in their high state unless the latch enable is active. When the latch enable signal is active, the latch section is activated and the logic state of the inputs is transferred to the output.

When used as a multiplexer, the eight-bit data stream is fed into the data inputs of the chip. The address of the two-to-one multiplexer/decoder is determined by the address inputs. The multiplexer channel is determined by the channel select input and the output will be the bit corresponding to the selected address.

In single-bit latch mode, the latch of the DM74AS258N is used to store data. The data is then used to drive the high and low outputs. The data is fed into the latch data input and when the latch enable signal is high, the data is stored in the latch. The latch output will update with the logic state of the data input.

The DM74AS258N is also capable of operating as a 1-to-8 decoder. This allows for the conversion of an 8-bit address to one of eight active outputs. The address is fed into the data inputs and the output is then determined by the address select inputs. The address inputs are active low and must be a logical 0 to activate the associated output.

When used as a 1-to-4 multiplexer, the data is fed into the data inputs and the address select inputs are used to select one of four active outputs. The address bit that is active must be at logic 0 for the corresponding output to be active. As with single-bit latch mode, the data is fed into the data input and stored in the latch when the latch enable is high.

The DM74AS258N is a versatile and useful logic device with a wide range of applications. It can be used as an 8-bit two-to-one multiplexer/decoder, 1-to-8 decoder, and four independent 1-to-4 multiplexers. It is commonly used in a variety of electronic applications due to its fast switching speeds and high noise immunity. It is offered in several different packages and can operate off of a single power supply.

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