74LVC38AD,112

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Introduction – 74LVC38AD,112

The 74LVC38AD,112, a non-inverting 3-to- 8 line decoder/demultiplexer, is a member of the Texas Instruments LVC (Low Voltage CMOS) family of devices. LVC technology combines CMOS speeds and CMOS power while offering the ability to operate down to 2V with very low static power consumption. The device uses CMOS technology with hot-electron injection programming to secure a high-speed/low power operation with very low static power consumption. The device features a 3-bit input, 8-outputs, and an active-high enable input.

Application Field and Working Principle

The 74LVC38AD,112 is intended for a variety of application fields, mainly for multiplexing and decoding applications. The device can be used as a 2-to-4 line decoder, 4-to-16 line decoder or a 3-to-8 line decoder, depending on the orders in which the enable and outputs are connected. This device features high-noise immunity and excellent latch-up immunity, making it an ideal IC for multiplexer and decoding applications.

The working principle of the device can be illustrated with a circuit diagram. When the enable input (EN) is low, all outputs are put in a high impedance state. When EN is high, the output (A, B and C) is decoded and put in the appropriate logic state according to the input signals. The logic state of the output is determined by the logic state of the three input signals (address bits A2-A0). When all the three inputs A2-A0 are high, all the outputs will be low.

The 74LVC38AD,112 can be used as a multiplexer when EN is connected to A2–A0, and as a 3-to-8 line decoder when EN is connected to logic low. In the latter configuration, when EN is high and the three-bit address is sampled at A2–A0, the respective output is driven active. The device features a 3-to-8 line decoding capability and can be used used to provide a low-power, low-voltage, fully static decoding function.

The device has very low static power consumption due to its CMOS architecture. The 74LVC38AD,112 can operate with a power supply from 1.65V (typical) to 5.5V (absolute maximum). Its input and output voltages are compatible with both CMOS and TTL digital logic families, and it provides excellent noise immunity and latch-up immunity. The device is designed to be propagation-delay and power-consumption-insensitive, meaning the outputs will not switch states until the inputs have settled, regardless of the clock rate or power supply voltage.

Conclusion

The 74LVC38AD,112 is a non-inverting 3-to- 8 line decoder/demultiplexer that is intended for multiplexing and decoding applications. The device can be used as a 2-to-4 line decoder, 4-to-16 line decoder or a 3-to-8 line decoder, depending on the orders in which the enable and outputs are connected. The device features high-noise immunity and excellent latch-up immunity, making it an ideal IC for multiplexer and decoding applications. It can operate with a power supply from 1.65V (typical) to 5.5V (absolute maximum), and its input and output voltages are compatible with both CMOS and TTL digital logic families.

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