CD74HC138M

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The CD74HC138M is a 3- to 8-line decoder/demultiplexer (3:8 decoder/demux) with extended voltage range, high speed, and low power. It is designed to operate with a wide range of input voltage (1.65V to 4.6V) and provides two mutually complementary outputs in each output stage.

The CD74HC138M has three address inputs (A2, A1 and A0) and eight active-low outputs (active-low Y7 to Y0). When the device is enabled, it decodes the binary information present on the address inputs and selects one of the eight active-low outputs. When the device is disabled, all outputs are high-impedance independent of address logic level (Hi-Z).

CD74HC138M is a 3- to 8-line decoder/demultiplexer logic device. It contains an output enable input which can be used todisable all outputs. The lowpower consumption makes them suitable for portable applications, particularly in battery operated systems. The 20-lead SSOP package along with its wide operating voltage range and compliance to various automotive requirements makes the CD74HC138M an ideal solution for performance intensive applications. The CD74HC138M is suited forbus-oriented applications such as automotive electronics, Telecommunications and process control applications.

The CD74HC138M works in two different ways: either under active-low enable (E = 0) or active high enable (E = 1). In active-low enable mode all outputs will be high impedance (HIZ) independent of address logic level when enable is low. Therefore, the outputs are not affected,even when multiplexing inactive address information onto the address inputs. Since the outputs are active-low, a logic zero on the selected output forces the corresponding output low. The enableinput doubles as active-low enable and active- high enable. When enable is set to high, the device will enable the selected output to go low or enable all output to go high, depending on the state of the address inputs. The CD74HC138M will only enable one output at a time in active-low or active-high enable mode and disabled all other outputs.

In terms of applications, the CD74HC138M is used in a variety of areas. It is used in automotive applications to provide address decoding, as well as in consumer electronics products like HVAC, air conditioning systems and audio equipment as a signal multiplexer. It is also often used in communications systems to multiplex signal inputs and control various data buses. The CD74HC138M is an ideal component in designs with strict power budgets, as it can operate at very low input voltage. The logic device is also capable of high-speed operation and can effectively reduce the power consumption of a system.

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