CY74FCT138TQCT Integrated Circuits (ICs)

Series:	74FCT
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Decoder/Demultiplexer
Circuit:	1 x 3:8
Independent Circuits:	1
Current - Output High, Low:	32mA, 64mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	4.75 V ~ 5.25 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Supplier Device Package:	16-SSOP
Base Part Number:	74FCT138

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The CY74FCT138TQCT is a high speed low power TTL compatible logic triple 1-of-8 multiplexer/demultiplexer with select inputs and enables. Utilizing its three sets of dual select and enable inputs, the CY74FCT138TQCT supports a variety of switching and multiplexing applications.It can be used for implementing redundant data paths, combining signals from multiple sources, or for building synchronous pipelines. It is also useful for providing data selections for a FIFO buffer, as a test bus node, or as a data selector.The CY74FCT138TQCT has an open collector output and can be used to support two-way communication. This is done by connecting two of the select inputs to the same source. The output of the multiplexer is then routed to the enable input of the opposite device, allowing the two to exchange data in both directions.The CY74FCT138TQCT is capable of input–output delays as low as 5ns. Looking at the timing characteristics, it is evident that the multiplexer and demultiplexer functions are independent and do not interfere with each other. The CY74FCT138TQCT has an extremely low power consumption of 1.2 mA.The CY74FCT138TQCT has an output enable control which can be used to drive outputs disabled by the enable inputs. This output disable function (as opposed to the traditional input disable function) allows for improved power savings when multiplexers are used in large arrays for applications where all elements are not enabled simultaneously.In order to select the output from among the eight possible channels, the CY74FCT138TQCT uses two select inputs so that each selector line can produce eight blocks. The CY74FCT138TQCT will also support a ‘broadcast’ mode in which all outputs are enabled simultaneously.The CY74FCT138TQCT also has an asynchronous reset function. This is useful in control applications where the multiplexer is used with a reset signal to control which signal is selected.The CY74FCT138TQCT is available in an 16-pin TQFP, SOIC and other surface mount packages and is housed in a lead-free package.In conclusion, the CY74FCT138TQCT is a robust, low-power, high-speed multiplexer/demultiplexer that can be used in a variety of applications. Its multiple inputs, output enable control and asynchronous reset function make it a versatile, cost-effective and energy-efficient solution.

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