CD74HCT154EN

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The CD74HCT154EN is a 4-line to 16-line decoder/demultiplexer from Texas Instruments. It is part of Texas Instruments’ High-Speed CMOS logic series, offering high levels of noise immunity. It contains 4 input lines, 16 active-low output lines, and an enable input, each of which have a buffered output. It is a perfect fit for logic-signal switching, multiplexing, and decoding applications.

This device is typically used in applications that require programmable logic decoding, such as access control and security systems, segmented displays, multiplexers, and decoders. A typical application circuit is shown below.

To understand how the CD74HCT154EN works, we must first know how it is wired. The Enable input is connected to IN0, with higher voltage enabling the device. The remaining four inputs are connected to active-low outputs. When the enable input is activated, the active-low output lines become active. For example, series 0 contains the active low unused output Q0, Q1 and Q4 followed by the active low used active output Q2 and Q3 for series 0.

The second series of outputs contains Q4 through Q7. Each additional output requires a different input combination to activate. For each series, a corresponding output is activated only when the set of inputs from IN1 through IN11 corresponds to that particular series. For example,series 1 outputs Q8 through Q11 can be activated by the use of four input lines.

The CD74HCT154EN also has two enable modes. When using the enable mode, the active-low enable input is used to force all outputs low. When using the disable mode, the active-low enable input forces all outputs high.

The CD74HCT154EN is a low power consumption, low voltage IC, using direct and dynamic logic-level control. It is designed to operate in single 3.3V power supply environment and is certified compliant to the RoHS-2 standard.

In summary, the CD74HCT154EN is a perfect fit for logic-signal switching, multiplexing, and decoding applications. It is a low voltage, low power consumption, and RoHS-2 compliant device that can handle up to 16 outputs and 4 inputs, which makes it suitable for a variety of applications.

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