SN74LVC138AQDREP

Series:	74LVC
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Decoder/Demultiplexer
Circuit:	1 x 3:8
Independent Circuits:	1
Current - Output High, Low:	24mA, 24mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	2 V ~ 3.6 V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	74LVC138

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Introduction to SN74LVC138AQDREP

The SN74LVC138AQDREP, otherwise known as a low-voltage CMOS logic device, is a logic switch, multiplexer, and decoder. With up to 3 inputs and 8 outputs, the SN74LVC138AQDREP provides an ideal solution for numerous high speed logic applications.

Overview and Description

The SN74LVC138AQDREP is comprised of 3 independent data selectors/multiplexers that can be enabled or disabled via the enable pins, making it ideal for logic applications requiring a wide variety of higher current outputs and for data routing. Its high speed performance, switching characteristics, and fail-safe features make it an ideal choice for applications such as data multiplexing and data routing in multimedia systems, digital TVs, and communications systems.A single SN74LVC138AQDREP device provides 8 outputs as well as up to three address inputs. These inputs are labeled A1, A0, and En; En is the enable pin. The device has one active high enable input, and two active high address inputs. The outputs are coded individually with its associated code words, and can be loaded with either active high logic levels or active low logic levels. The SN74LVC138AQDREP also offers TTL and push-pull compatibility on the output, which makes it an ideal choice for applications involving mixed signals. Additionally, the device features a fail-safe terminal protection circuit as well as an undervoltage lockout feature.

Application Fields

SN74LVC138AQDREP devices are widely used in applications involving data multiplexing and data routing. These applications include, but are not limited to, multimedia systems, digital TVs, and communications systems. The device is also used for logic applications requiring a wide variety of higher current outputs.The SN74LVC138AQDREP is also well-suited for consumer products, automotive electronics, and devices designed for automotive applications. With its 8 outputs and 3 address inputs, the SN74LVC138AQDREP is a great choice for applications requiring a variety of outputs and data control.

Working Principles of the SN74LVC138AQDREP

The SN74LVC138AQDREP works on the basic principle of logic driving. The logic driving principle is based on the issue of voltage level when feeding a logic input to the device. When fed a low voltage level (less than 0.8V) on any of its three inputs (A1, AO and EN), the device will output an active high (logic 1) voltage level. Conversely, when fed a high voltage level (more than 0.8V) on any of its three inputs (A1, AO and EN), the device will output an active low voltage level (logic 0).For example, when the device is initialized, the EN pin is low, A0 and A1 pins are high and the device will output an active low voltage level on all 8 outputs. When the EN pin is then activated, the A0 and A1 pins change states and cause the device to output an active low voltage level on the 8 outputs. This switchover of the EN pin is referred to as the logic driving principle. The logic driving principle is then used to ensure that the device outputs the appropriate voltage level when controlled by its 3 address inputs.

Conclusion

The SN74LVC138AQDREP is an ideal solution for numerous high speed logic applications due to its high speed performance, switching characteristics, and fail-safe features. It offers 8 outputs and up to three address inputs, which makes it an ideal choice for applications involving data multiplexing and data routing. Additionally, the device offers TTL and push-pull outputs, along with its fail-safe terminal protection circuit and undervoltage lockout feature. With its high performance and versatility, the SN74LVC138AQDREP is a great choice for a range of high speed logic applications.

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