CD74HCT139MG4

Series:	74HCT
Packaging:	Tube
Part Status:	Active
Type:	Decoder/Demultiplexer
Circuit:	1 x 2:4
Independent Circuits:	2
Current - Output High, Low:	4mA, 4mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-55°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	74HCT139

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CD74HCT139MG4 belongs Logic - Signal Switches, Multiplexers, Decoders. It is a CMOS quadruple 2-input multiplexer/demultiplexer. It provides a 1-of-4 or a 4-of-1 data indexing function. It is used for addressing and data routing applications.
This device has two address Inputs (A and B) and two data Inputs (Cx and Dx). When either Input A or B is high, the multiplexer routes the signal from Cx to the Output, and when both A and B are high, the signal from Dx to Output. Inversely, the demultiplexer routes the signal applied to the single Input C to either Output Cx or Dx, depending on the address Inputs A and B.

The main feature of CD74HCT139MG4 is the low power consumption it offers, the quiescent power is typically 10nA, and the maximum propagation delay time from Input to Output is typically 12ns at 5V, 14ns at 3.3V. In addition, the operating temperature range is from 0°C to 70°C.

CD74HCT139MG4 has wide applications fields. The main applications of this device include Data bussing and source/destination decoding, industrial data processing and management control, bus interfaces and drivers, memory addressing, and keyboard scanning.

As for the working principle of CD74HCT139MG4, when either Input A or B is high, the multiplexer routes the signal from Cx to the Output. This is done by using a pair of complementary pass transistors to enable Cx and shut off Dx when either Input A or B is low. When both A and B are high, Cx is shut off and Dx is enabled. This is done by using a pair of complementary pass transistors in the opposite direction.

Inversely, the demultiplexer routes the signal applied to the single Input C to either Output Cx or Dx, depending on the address Inputs A and B. This is done by using an AND gate for each Output. When A and B are both low, an inverter and NAND gate pair enable the Output Cx, and when both A and B are high, an inverter and NAND gate pair enable the Output Dx.

CD74HCT139MG4 is a versatile multiplexer/demultiplexer. Its low power consumption and fast switching time make it very suitable for data bussing and source/destination decoding applications. Furthermore, it can also be used in other diverse industrial applications such as memory addressing and keyboard scanning.

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