74151 IC PDF

IC Figure below shows the 8-to-1 multiplexer Integrated circuit of TTL family This Integrated circuit has active LOW ENABLE input and gives. Texas Instruments [ KB ]; Data Sheet (current) [88 KB ]; Fairchild Semiconductors [58 KB ]; Data Sheet (current) [ KB ] 8-Input Multiplexer IC. I3, 1 •, 16, Vcc. I2, 2, 15, I4. I1, 3, 14, I5. I0, 4, 13, I6. Y, 5, 12, I7. Y, 6, 11, S0. E, 7, 10, S1. GND, 8, 9, S2. Pin, Symbol, Description. 1, I3, multiplexer input.

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A multiplexer mux or a data selector or input selector is a combinational circuit device that selects one of N inputs and provides it on its output. A set of inputs called select lines determine which input should be passed to the output.

A multiplexer with 2 N input lines requires N select lines. Multiplexers are useful in any application in which data must be chosen from multiple sources to a single destination.


Additionally multiplexers have also found their way to various other circuits such as adders. A multiplxer is a device that receives multiple inputs from usually different sources. A set of select lines are then used to choose which of those inputs gets produced as output.

Signals to the select lines usually come from a control unit that determines which, if any, of the signals should be routed to some destination. MUXes are core components in most digital systems as they can be used to pass the 7451 signal based on some conditional logic.


For example, consider 741151 data bus that is connected to multiple memory storage units. One can use a multiplexer to select which of those lines should be going to the shared data bus. It’s often desirable to add an enable or strobe input EN to a multiplexer. An enable input makes the multiplexer operate. Those types of multiplexers can be hooked up directly to a shared bus ensuring that only one signal is being generated on the bus at any given time.

For a multiplexer with Equation upper N inputs, you also need Equation left ceiling log Subscript 2 Baseline left-parenthesis upper N right-parenthesis right ceiling selection lines. It does mean that for multiplexers with odd number of inputs, some selection line combinations are not allowed e.

Where Equation m Subscript k is the kth minterm of the variable. Many different variations of multiplexers exist. Typically larger multiplxers over 8 or 16 inputs are built using smaller multiplxers id a multiplexer tree. The simplest multiplexer is the 2: Its selection lines is therefore made of a single bit. A truth table is provided on the right.

– 8-input multiplexer – ChipDB

The K-Map for that truth table is provided on the left. From 7451 the sum of minterms and the logic function for a 2: The top transmission gate controls if the input from A should pass to the output while the bottom transmission gate does the same for the B input.

A single inverter is used to invert the selection line value to one of the gates so that only one of them jc.


While smaller overall, this multiplexer is also nonrestoring. There are many way to construct a 4: Multiplexers generally only come 74511 a few common sizes. Even in ASIC design, arbitrary sized multiplexers are not always offered.

Large multiplexers can always be built from ix collection of smaller ones. Consider a register file with 32 registers where we only want to select a single register at any given time.


Such multiplexer can be design from four 8: Various multiplexers are available in discrete chips as well for both series and series. A common multiplexer is the 8: Note that the implementation below is an active-low. Vcc is on pin 16 and GND is on pin 8.

Pins 5 and 6 are the outputs, the output on pin 6 is the inverted version of the output on pin 5. The enable is on pin 7.

Multiplexer Typical Symbol 2: Retrieved from ” https: This page was last modified on 18 Novemberat Privacy policy About WikiChip Disclaimers. This section requires expansion; you can help adding the missing info. This section is uc you can help add the missing info by editing this page. MUX with an SR latch. Output same as input, High-Z Enable.

Complementary outputs, High-Z Enable.