MM74HC688N

Series:	74HC
Packaging:	Tube
Part Status:	Obsolete
Type:	Identity Comparator
Number of Bits:	8
Output:	Active Low
Output Function:	A=B
Voltage - Supply:	2 V ~ 6 V
Current - Output High, Low:	5.2mA, 5.2mA
Max Propagation Delay @ V, Max CL:	30ns @ 6V, 50pF
Current - Quiescent (Iq):	8µA
Operating Temperature:	-40°C ~ 85°C
Package / Case:	20-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Base Part Number:	74HC688

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MM74HC688N

Introduction:

MM74HC688N is an eight-input multiplexer with an output logic level of 0–5 V, designed for high-speed logic applications. The inputs are organized as two four input multiplexers with one common output terminal. Symbolically, it is represented as two separate four-input multiplexers, despite being physically implemented on a single chip. This multiplexer type is suitable for digital signal switching, multiplexing, and parallel programming.

Application fields:

MM74HC688N multiplexers are ideal for implementing control applications like digital inspection systems, programmable logic controllers, automation systems, robotics, and machine vision systems. Further, they can be used to combine and/or separate multiple signals over a wide range of frequencies such as audio and video. Additionally, the multiplexers can be used to reduce the number of pins used in an application, which reduces board size, power consumption, and cost.

Working principle:

The MM74HC688N multiplexer consists of four pairs of inputs and an output terminal. The connections for the four pairs of input–output terminals are shown in the figure. Every input/output terminal is laid out in its own row. With the help of four selector pins, the desired input–output pair from any of the four input terminals can be chosen. The two selector pins operate in pair, controlling two 4-to-1 multiplexers simultaneously.

Control of the multiplexer:

The control of the multiplexer is facilitated by four selector pins which are used to select which of the four inputs is directed to the output. For example, if the selector pins are set to 00, the first input is selected and directed to the output terminal. If the selector pins are set to 11, then the fourth input is selected as the output. The selector pins must be set in either binary combinations of 00, 01, 10, or 11 depending on the desired output.

Conclusion:

MM74HC688N multiplexer is an ideal solution for applications that require the transfer of multiple signals. They can be used to combine, separate, reduce, and switch signals across different frequencies. Additionally, the multiplexers can be used to reduce the number of pins needed for an application, thus reducing the space requirements, power consumption, and cost of an application.

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