SN74F258DRG4

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The SN74F258DRG4 application field is within logic and signal switches, multiplexers, and decoders. It is an 8-bit 3-to-8 line decoder/demultiplexer with a 3-state output. The device is intended to be used in high-speed, high-density logic systems where wide data and address buses are used. The device changes an active-low binary code on three inputs to a single output line among eight, depending on the binary state of the inputs. All inputs are enabled by a common active-low enable input, which can be used to show or ignore the input or outputs.

The working principle of the SN74F258DRG4 is simple. It sets up a 0, 1, or High-Z (high impedance) state on its 8 outputs depending on the combination of switches, addressing of memory devices, or decoding of encoders and decoders. The following truth table applies for the device:

Select A B C Output
0 0 0 0 A High
1 0 0 1 B High
2 0 1 0 C High
3 0 1 1 D High
4 1 0 0 E High
5 1 0 1 F High
6 1 1 0 G High
7 1 1 1 H High

The SN74F258DRG4 has two input active low enable pins (E1, E2). Logic 0 at E1 forces D0 to D7 high-impedance state, whether the selection inputs are at logic 0 or logic 1 level. Likewise, logic 0 applied to E2 forces A, B, and C to the high-impedance state. This function is useful when more than one SN74F258DRG4 is used in a system and more than one chip\'s output is intended to be enabled at a time.

The SN74F258DRG4 control lines can be sourced with a TTL level input, providing a wide range of applications. This device incorporates the direct interface logic between microprocessors, EPROMs and PLAs. It is capable of driving several bus lines directly with a wider bus structure. Also, this device is ideal for data recovery, data storage and data selection functions in digital systems.

The SN74F258DRG4 is fabricated using the low power silicon gate CMOS technology. This device is common-collector fanout with three inputs, eight outputs, and two enables. The fanout allows multiple inputs and outputs to be connected without degradation in performance. The device requires just two logic supply plus voltages (VCC and VEE) for proper device operation. It is available in two packages: 16-pin plastic DIP and SOIC for surface mounting.

The SN74F258DRG4 device is designed to be used in most applications where 8-bit data and control buses in the multiplexer are needed. It is suitable for industrial, commercial, and military applications. It has a wide range of applications that can be incorporated in systems such as automobiles, medical electronic equipment, communication equipment, power supplies, and consumer electronic applications.

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