MC74HC157AFELG

Series:	74HC
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Data Selector/Multiplexer
Circuit:	4 x 2:1
Independent Circuits:	1
Current - Output High, Low:	7.8mA, 7.8mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	2 V ~ 6 V
Operating Temperature:	-55°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.209", 5.30mm Width)
Supplier Device Package:	16-SOEIAJ
Base Part Number:	74HC157

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The MC74HC157AFELG is a device in the category of Logic - Signal Switches, Multiplexers, Decoders. It is a multiplexer/demultiplexer that is pin-programmable for 2-4 bit demultiplexing or 4-8 bit multiplexing.In the application field, the MC74HC157AFELG is commonly used to switch signaling between multiple nodes. It can be used to switch multiplexed serial signals in a wide range of data processing and communication applications. It can also be used to combine 8-bit ports into a 4-bit bus and separate the bus back into 8-bit ports, allowing a device to utilize more I/O pins than it physically possesses.In terms of working principles, the MC74HC157AFELG is a multiplexer/demultiplexer that utilizes an enable/disable logic control pin. This pin is used to control the in/out state of the device. When the enable/disable control pin is held low, the device is disabled, which forces the outputs to stay in their enabled state. On the other hand, when the enable/disable pin is held high, the device is enabled and the I/O pins will act as either inputs or outputs depending on the logic state of the control pins.The MC74HC157AFELG is capable of handling up to 8-bit multiplexing/demultiplexing, meaning it can handle both 8-bit ports and 4-bit buses. When the device is used to combine 8-bit ports into a 4-bit bus, it stores the data in a register and transfers it to the desired location when it is needed. Similarly, when the device is used to separate a 4-bit bus back into 8-bit ports, it stores the data in a register and then transfers the data to the desired location.The MC74HC157AFELG is also capable of handling up to 4-bit demultiplexing, meaning it can separate 4-bit ports into individual ports. When the device is used to separate 4-bit ports into individual ports, it identifies which port to actuate and signals it to the output pin accordingly.Overall, the MC74HC157AFELG has a wide range of applications in signal switching and data processing and communications. It is versatile, owing to its ability to both multiplex and demultiplex signals as well as handle up to 8 bits of data, and reliable, thanks to its enable/disable logic control pin.

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