SN74HCT139DE4

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The SN74HCT139DE4 is a logic-signal switch, multiplexer, and decoder. It is a high-performance CMOS device consisting of two 4-channel multiplexers and two 2-channel multiplexers with enable inputs and common select inputs. The enable inputs enable selective connections between two of the four channels and the common select inputs enable the device to perform multiplexer or decoder functions. The SN74HCT139DE4 is designed to operate from a single or dual supply voltage as low as 3.0V and up to 15V.

The SN74HCT139DE4 is an ideal solution for logic switching applications such as computer systems, communications systems, instrumentation systems, and many more. It is capable of handling digital signals that are either TTL or CMOS compatible and has an output rate of 8 kHz. The device is designed to have an extremely low power consumption and features excellent noise immunity.

The SN74HCT139DE4 has two independent 4-channel multiplexers, each with four independent channels (A, B, C, and D) and a common select input (S). The multiplexer can be configured to perform various functions, such as mixing different signals, selecting between two signals, and buffering input signals. The output of the multiplexer is dependent on the select input, which determines which input is connected to the output. When the select input is ‘0’, A is connected to the output; when S is ‘1’, B is connected to the output.

The SN74HCT139DE4 also has two independent 2-channel multiplexers, each with two independent channels (X and Y). The multiplexer can be configured to perform either of two functions: 2-channel multiplexing or 2-channel decoding. For usage in multiplexer mode the X and Y inputs are connected to the two different signals, and the select input determines which of the two signals is connected to the output. For usage in decoder mode, the X and Y inputs are connected to the same signal, and the select input determines which of the two decoder outputs is connected to ‘0’ while the other is connected to ‘1’.

The SN74HCT139DE4 also features two enables inputs that can be used to enable or disable the device, allowing for selective connection between two of the four multiplexer channels. For example, when E1 input is ‘1’, A and D channels are connected and when E2 input is ‘1’, B and C channels are connected. The device also has an active low reset input that functions as an asynchronous reset to ensure all outputs are set to low when the reset is active.

The SN74HCT139DE4 is available in two packages: a wide-body package that offers high voltage and high current capacity and a narrow-body package that is more compact and offers lower voltage and lower current capacity. The wide-body package also features power-saving active current reduction technology, which reduces the device power consumption when not in active-mode.

The SN74HCT139DE4 is a versatile logic-signal switch, multiplexer, and decoder that offers the possibility to perform multiple functions and applications. It is an ideal solution for systems requiring high-speed signal switching, multiplexing and decoding, and for applications that require low power consumption and noise immunity.

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