N74F153D,623 Integrated Circuits (ICs)

Series:	74F
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Multiplexer
Circuit:	2 x 4:1
Independent Circuits:	1
Current - Output High, Low:	1mA, 20mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SO
Base Part Number:	74F153

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Introduction

N74F153D,623 is a dual 4-to-1 multiplexer with Schmitt triggers used in logic - signal switches, multiplexers, decoders. It combines both a 4-to-1 multiplexer and a 2-to-1 multiplexer in one single package, making it an ideal solution for applications that require minimal device input selection. It also features two Schmitt trigger inputs on each input line, allowing it to minimize changes in input signals due to noisy or slow signals. In addition, it features added protection against false triggering due to noise signals, making it a suitable device in applications where noise immunity is paramount.

Application Field

N74F153D,623 is commonly used in switching and transmission applications, such as switchable antenna systems, industrial automation, and RF/microwave switching, that require reliable signal switching. It can also be used in high frequency signal impedance matching, signal encryption, and in applications that require great noise immunity due to its Schmitt trigger inputs.

Working Principle

N74F153D,623 utilizes a combination of four input lines and two Schmitt trigger inputs to form a dual four-to-one multiplexer with added Schmitt trigger inputs. The four input lines are fed with either digital or analogue signals, and the two Schmitt trigger inputs are used to identify, amplify, and define the threshold of each input signal. When a signal is identified, it is then routed to one of the four output lines based on the status of the two Schmitt triggers. This allows the device to decide which signals should be transmitted and which should be ignored. In a typical configuration, all four inputs are connected to the same ground, thus isolating each line from the other. When the control voltage is high, the 1 control line is set and enables the multiplexer, thereby allowing the transfer of the signal from the 1 input to the 1 output. Similarly, when the control voltage is low, the 0 control line is activated and the 2 input line is connected to the 0 output. The Schmitt triggers are used to further improve the signal isolation and the noise rejection capability of the multiplexer by allowing the user to identify which signal should be routed to the output. This is done by adjusting the two inputs to different voltage levels, thus defining two thresholds. The signal is only accepted and passed on if it is above or below the two thresholds.

Conclusion

N74F153D,623 is an ideal choice for logic - signal switches, multiplexers, decoders. It is a dual 4-to-1 multiplexer with Schmitt triggers, providing reliable signal switching and immunity from false triggering due to noise. Its Schmitt trigger inputs allow it to identify and amplify signals, enabling the device to identify which signals should be transmitted and which should be rejected. Its low power consumption, high noise-rejection capability, and small package size make it a desirable choice for applications that require reliable signal transfer.

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