SN74S85NSRE4

Series:	74S
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Magnitude Comparator
Number of Bits:	4
Output:	Active High
Output Function:	A<B, A=B, A>B
Voltage - Supply:	4.75 V ~ 5.25 V
Current - Output High, Low:	1mA, 20mA
Max Propagation Delay @ V, Max CL:	18ns @ 5V, 15pF
Operating Temperature:	0°C ~ 70°C
Package / Case:	16-SOIC (0.209", 5.30mm Width)
Mounting Type:	Surface Mount
Base Part Number:	74S85

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Introduction:

The SN74S85NSRE4 is a quad-comparator integrated circuit (IC) in the TI Logic family of devices. It is used to compare analog and digital signals in the form of voltages or currents. It is a single-ended, open-collector comparator. When an input has a lower voltage or current, it will output a logic low level in order to indicate the correct low-level signal. When an input has a higher voltage or current, it will output a logic high level to indicate the correct high-level signal.

Applications:

The SN74S85NSRE4 is used in many industrial and commercial applications. Its primary use is in sensing and amplitude detection systems. It can detect whether a signal has exceeded a certain level and activate a device, such as a relay, in order to trigger an action. This comparator is also used to generate waveforms and pulses, and to perform analog-to-digital conversion. Additionally, many clock pulse generators employ the SN74S85NSRE4 as a time-tick generator.The SN74S85NSRE4 can be found in printer circuits, analog-to-digital converters, voltage reference circuits, current limiter circuits, and other digital systems. It is also commonly used in motor speed control applications, including motor speed sensing, motor speed regulation, motor anticoupling, and motor stall detection. In addition, it is often found in data acquisition systems, automotive systems, and medical equipment, as well as in circuit protection systems and in hazard monitoring circuits.

Working Principles:

The SN74S85NSRE4 is a quad-comparator IC with four independent inputs. Each input is compared to a reference voltage (Vref) which is input to the chip through a common input pin. When the voltage of any of the inputs exceeds the reference voltage, the output of the comparator is driven to a logic high. Conversely, if the voltage of any of the inputs is lower than the reference voltage, the output of the comparator is driven to a logic low.The SN74S85NSRE4 is a open-collector product. This means that the output is connected to a pull-up resistor. When the output is driven to a logic low, the resistor is pulled up to the supply voltage, providing an open-drain output. The pull-up resistor has a value of 10KΩ. This allows the logic low output to remain stable despite fluctuations in supply voltage or environmental conditions.

Conclusion:

The SN74S85NSRE4 is an open-collector comparator integrated circuit (IC). It is used in many industrial and commercial applications, such as motor speed control, analog-to-digital conversion, and waveform generation. The SN74S85NSRE4 compares four independent inputs to a reference voltage (Vref) and output a logic high if the voltage of any of the inputs exceeds the reference voltage. Conversely, if the voltage of any of the inputs is lower than the reference voltage, the output of the comparator is driven to a logic low. The pull-up resistor has a value of 10KΩ, which allows the logic low output to remain stable despite fluctuations in supply voltage or environmental conditions.

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