SN74AS885NT

Series:	74AS
Packaging:	Tube
Part Status:	Obsolete
Type:	Magnitude Comparator
Number of Bits:	8
Output:	Active High
Output Function:	A<B, A>B
Voltage - Supply:	4.5 V ~ 5.5 V
Current - Output High, Low:	2mA, 20mA
Max Propagation Delay @ V, Max CL:	17.5ns @ 5V, 50pF
Operating Temperature:	0°C ~ 70°C
Package / Case:	24-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Base Part Number:	74AS885

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Introduction

The SN74AS885NT is a low power voltage Comparator designed for applications in logic and analog systems. This chip features two differential inputs and two separate high-speed outputs, allowing for highly accurate, microscopic precision-based comparison of two input voltages. Additionally, it allows a wide operating voltage range, providing flexibility for a variety of applications. Together, the SN74AS885NT application field and working principle allows for efficient and versatile comparisons of various amplitudes and wave forms.

SN74AS885NT application field and working principle

The SN74AS885NT is used to compare two driven voltages with respect to their magnitude, polarity, and phase. In reality, the comparator chip is made up of two comparators, where one (U1A) compares the negative voltage, and the other (U1B) compares the positive voltage. The driving voltages present to the two inputs of a Comparator are V+ and V–, where V+ is the positive voltage and V– is the negative voltage. The voltage applied to V+ is the reference voltage and the voltage on V– is the inverting input. The two output states: HIGH and LOW, correspond to the input voltage states in terms of their magnitude and polarity. If the greater magnitude is applied to the V+ input, the output will be HIGH, otherwise it will be LOW. Furthermore, if the absolute value of the voltage applied to the V+ input is equal to the absolute value of the voltage applied to the V– input, the output will be commensurate with the polarity applied to the V+ input.The SN74AS885NT works with a wide range of operating voltages, ranging from -2.0V to +7.0V. In addition, the maximum input offset provides superior comparison precision, even for signals with very small magnitudes. This Comparator is also unique in that it is equipped with two individual outputs, U1A and U1B. These outputs can be used to enable different logic functions, with the output of one comparator as the enable for the other logic device. Thus, this device can be used to enable two separate logic functions with a single comparator.

SN74AS885NT Application Examples

The SN74AS885NT provides an efficient and effective comparison device for analog and digital systems. The two output states, HIGH and LOW, allow for easy comparison between two voltages. The operating voltage range and precision enables comparisons of small signals with great accuracy. For example, this Comparator can be used in analog circuits to compare input signals and enable them based on their magnitude. It can also be used in logic circuits to decide on the course of action to take based on the input conditions. In digital logic, Comparators can serve as digital counters, comparing the two input signals and counting them up or down as needed. The SN74AS885NT can also be used in other applications, such as security systems, temperature control, signal processing, signal filtering, and power control. Comparators are also used to detect signal edges, where they can be used to detect rising or falling signal events and generate an interrupt.

Conclusion

The SN74AS885NT is a versatile and reliable comparator with a wide operating voltage range and precise comparison resolution. It can be used in a variety of applications, from analog and logic systems to security and signal processing. Furthermore, by pairing two outputs, the device can be used to enable two separate logic functions. Thus, the SN74AS885NT has become an important component of various analog circuits, digital logic systems and various other applications.

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