DM74ALS138N

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The DM74ALS138N is a commonly used model of a 3-to-8 line digital decoder and demultiplexer. It belongs to the Logic - Signal Switches, Multiplexers and Decoders category. This model features high performance, low power TTL logic, and is typically used for logic expansion, address decoding and data routing applications. It is a single chip, three-state logic device that is designed to operate with logic levels compatible with most popular 5V systems.

The DM74ALS138N is composed of three active low enable inputs (E1, E2 and E3) and eight active low data switching inputs, S0 to S7. The decoder will select the correct data input, which is indicated by a low logic level at the corresponding one of the eight output pins, Y0-Y7. The appropriate output is determined solely by the states of the three enable inputs, E1–E3. According to this, the device can decode and select any one of the eight active low inputs.

The DM74ALS138N has three active low enable inputs (E1, E2 and E3). When the enable input is at a low logic level (0V), the device is enabled. When the enable input is high, logic 1 (5V), the device is disabled. When E1 and E2 are both high and E3 is low, the device is enabled in an “open” condition and all output pins are in the high impedance state. The device can be used as a 1 of 8 decoder or a 3 to 8 line decoder or demultiplexer. The device can also be used to generate decoding or multiplexing control inputs of common bus operating systems.

The DM74ALS138N is designed to meet the needs of high speed and low power TTL logic applications. The device has a propagation delay of 15ns, and is tolerant to both low and high logic levels. A wide operating temperature range from -55°C to +125°C and the ability to use a single 5V supply enables the device to function in complex, high-temperature industrial environments. The device features three enable inputs, E1–E3, which can be used as either single- or dual-input devices. The device also provides “Power Save” and “Power Down” functionality.

In summary, the DM74ALS138N is a single chip, three-state logic device designed to operate with logic levels compatible with most popular 5V systems. It is composed of three active low enable inputs (E1, E2 and E3) and eight active low data switching inputs. It provides the capability to decode and select any one of the eight active low inputs when the enable inputs are at the desired voltage states. The device features high performance, low power TTL logic and is capable of operating in complex, high-temperature industrial environments.

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