MC74ACT257MEL

Series:	74ACT
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Multiplexer
Circuit:	4 x 2:1
Independent Circuits:	1
Current - Output High, Low:	24mA, 24mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.209", 5.30mm Width)
Supplier Device Package:	16-SOEIAJ
Base Part Number:	74ACT257

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The MC74ACT257MEL is a logic device which enable the selection of one or more data lines from many possibilities in a logical switch. It is an 8-to-1 multiplexer with a flexible input/output interface which allows the multiplexing of any combination of digital signals. It is dedicated for use in digital systems where logic level signals need to be multiplexed. The MC74ACT257MEL functions as an 8-to-1 multiplexer. It is composed of two four-bit groups arranged in parallel. Each group can select any one of its four inputs for output. The selection inputs within each group are common, and the output is common to both groups. The signals can be slow or fast edge, CMOS or TTL compatible.The MC74ACT257MEL has eight data input pins, two select inputs, two enable pins and a single output pin. The two select inputs s0 and s1 are used to select a single input out of eight data input pins. The two enable pins en0 and en1 are used to control as to whether the device should take input or not. The output is always active and connected to one of the eight data inputs. The output can be configured as active-high or active-low by controlling the values of the enable inputs.The working principle of the MC74ACT257MEL is quite simple. It responds to the logic level of the select inputs, s0 and s1, and enables the data input pins to which in turn controls the selection of a single item from the available eight inputs. The two select inputs are theaddress inputs of the device which can be used to select the required output out of eight possible inputs. The two control pins, en0 and en1, are used to disable or active the selection process by controlling the logic level of these pins. The MC74ACT257MEL is a good choice for multiplexing circuits as it has low speed, low-power and helps saves area on the circuit board. The device is intended for switching applications where high speed performance is not required. It provides low standby current with guaranteed high temperature operation. The MC74ACT257MEL can be used in a wide range of applications such as octal demultiplexer in multiple data line transfer applications, processing of static memory, FIFO buffers, serial to parallel conversions and data selection for microprocessors and data bus applications. It effectively replaces hardwired logic functions in a number of traditional applications.The MC74ACT257MEL can also be used as a decoder in multiple data lines transfer applications. For example, it can be used in systems to decode address signals and activate single device out of many. In multiplexing application it can route signal from one port to many or many to one. It can also be used in multiplexing memory address and control signals, routing of multiple lines to a single device or line distribution across multiple devices. It can be monitored through software and used to set up multiple configurations. Software can be used to enable modes which can guarantee proper system operation and minimize errors.The MC74ACT257MEL can be used in a variety of logic and signal switching applications, from multiplexing memory and control signals, to dual data line routing and line distribution, and even for decoding multiple address signals. It offers benefits such as low speed, low-power and small board area, making it a great choice for multiplexer and decoder applications.

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