SN74154N

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SN74154N is a high-speed BCD-to-decimal decoder made of TTL series integrated logic BCD coded data. It belongs to Logic - Signal Switches, Multiplexers, Decoders. The SN74154N has a 4-bit BCD (binary coded decimal) parallel data input, four active low output lines, and an active low enable line. It can select the output line go low when the A, B, C, D input which is labeled A0, A1, A2, A3 or its complement matches the input data.

SN74154N application field can be found in digital systems and electronic circuits. It is often used as a decoder or demultiplexer in the process of coding and decoding digital images, sound, data and other information.

The internal circuitry of SN74154N consists of transistors, resistors, capacitors and biasing network. Each output is logically AND combination of two NOT gated BF (base-emitter) unit with a BF for each input. All BF units have a common base connection with the ground through a resistor. An input signal is applied to the input terminal and to the base of the corresponding BF unit. When a logical high input is applied to the input terminal, its corresponding BF is activated and the base current flows through the resistor to ground.

The SN74154N also contains an active low enable terminal. When the enable terminal is at logic low, all outputs will be inactive. The advantage of this device is that it requires fewer ICs with fewer pins as compared to other devices such as 16-to-1 multiplexers. The device also requires less power, which makes it suitable for portable and battery-operated electronics.

In summary, SN74154N is a high-speed BCD-to-decimal decoder made of TTL series integrated logic BCD coded data. It belongs to Logic - Signal Switches, Multiplexers, Decoders. Featured by its small size and low power consumption, SN74154N can be applied in digital systems and electronic circuits as a decoder and demultiplexer for coding and decoding digital images, sound, data and other information.

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