CD74HC85MG4

Series:	74HC
Packaging:	Tube
Part Status:	Active
Type:	Magnitude Comparator
Number of Bits:	4
Output:	Active High
Output Function:	A<B, A=B, A>B
Voltage - Supply:	2 V ~ 6 V
Current - Output High, Low:	5.2mA, 5.2mA
Max Propagation Delay @ V, Max CL:	33ns @ 6V, 50pF
Current - Quiescent (Iq):	8µA
Operating Temperature:	-55°C ~ 125°C
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Base Part Number:	74HC85

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Logic - Comparators

The CD74HC85MG4 is a high-performance four bit comparator, which is used for comparing the relative magnitudes of two binary numbers. This device not only provides a simple comparison of the two inputs, but also allows users to customize the output depending on the desired threshold set. As a result, the CD74HC85MG4 is used extensively in many different applications, ranging from basic control systems to high-performance medical imaging devices.The core of the device consists of several small circuits called gates. Each of these gates has two inputs and one output, and these inputs and outputs are configured in such a way that a logic signal is generated based on the comparison of the two inputs. Depending on the logic of the gate, the output could either be low or high. Generally, a high logic signal is generated if the two inputs are equal, and a low logic signal is generated if the two inputs are different.The working principle of the CD74HC85MG4 is fairly simple and can be explained through a basic example. Let us assume that we have two inputs, A and B, and these inputs can take on any value between 0 and 7 (in binary representation). Now, if we set the threshold to 2, then the output of the comparator will be high if A is greater than or equal to 2, and will be low if A is less than 2.In addition to its primary application as a logic comparator, the CD74HC85MG4 is also commonly employed as an analog comparator. While the functionality is largely the same, in this case the inputs can take on any value from -15V to +15V, and the output will be either low or high depending on whether the voltage of the two inputs is equal or not.The CD74HC85MG4 is also well suited for interfacing with digital logic, due to its low-power consumption and wide range of compatible output sources. In this application, the device is used to convert a digital input signal into either a low or a high output, depending on the level of the input signal, as well as its polarity. As a result, the CD74HC85MG4 can be used as an interface between control systems and logic circuits, allowing them to communicate with each other without any additional hardware.Finally, the CD74HC85MG4 is also used in high-precision medical imaging devices, where it is responsible for detecting the presence or absence of certain levels of electrical or optical signals. In this case, the device acts as a detection circuit and can serve both diagnostic and therapeutic purposes.In conclusion, the CD74HC85MG4 is a highly versatile, low-power, high-precision logic comparator that can be used in a wide range of applications. Its small size and low-power consumption make it ideal for tight spaces and battery-powered devices. Furthermore, its simple programming and wide range of compatible output sources make it easy to interface with other digital logic and control systems. As a result, the CD74HC85MG4 is a popular choice for many applications requiring the comparison of two binary numbers.

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