MC74VHC157DTR2

Series:	74VHC
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Multiplexer
Circuit:	4 x 2:1
Independent Circuits:	1
Current - Output High, Low:	8mA, 8mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	2 V ~ 5.5 V
Operating Temperature:	-55°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	16-TSSOP
Base Part Number:	74VHC157

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Logic-Signal Switches, Multiplexers, and Decoders are fundamental components in many electronic systems and provide an efficient way to control and manage the flow of data. The MC74VHC157DTR2 is a Quad 2-to-1 Data Selector/Multiplexer/Demultiplexer, offering superior performance that makes it ideal for applications where there is a need to select between two different data streams. This component is a leading example of the fast-switching, low-power devices available from ON Semiconductor, and is often used to interconnect two or more analog or digital chips to take advantage of the higher bandwidth and data throughput capabilities of the latest technology.In this article, we’ll take an in-depth look at the MC74VHC157DTR2 and discuss its application field and working principle. We’ll also discuss its features and benefits and list some of the most common applications for this component.The MC74VHC157DTR2 is designed to be a single chip, high speed replacement for discrete logic. It features a select input that determines which of the two data streams to be selected, and the output is driven low when the corresponding select line is high. The multiplexer can also be used as a demultiplexer by providing a write enable (WE) input. This allows for the selection of one data stream from multiple data sources.The device operates on a wide supply voltage range of 3.0V-20V and has an input edge rate of 4nS, which makes it suitable for a variety of applications. The device can be used in a variety of applications ranging from analog to digital switching systems, data communications, life support systems, and more. To ensure fault protection, the MC74VHC157DTR2 also includes active clamp resistors and depletion devices to provide additional protection against electrostatic discharge (ESD) and latch-up. The devices are also available in a 20-pin plastic small outline integrated circuit (SOIC) or via a standard-only package. The MC74VHC157DTR2 features an On Resistance (RON) of 17Ω, an Off Leakage Current (IL) of 0.05µA, an On Leakage Current (IH) of 0.4µA and an output short circuit current of 200mA. The device is also able to provide thresholds for reset and set operations.The MC74VHC157DTR2 can be used in many different applications, such as:1. Data selection in communications, modems, network routers, switchboards, and similar systems.2. Data buffering in order to reduce bottlenecking.3. Signal routing in data and image processing systems.4. Swapping data paths in telecommunications systems.5. Selecting digital and analog signals in systems with multiplexers, such as video switchers, computer video cards, and other applications.The internal functional block diagram of the MC74VHC157DTR2 can be seen in Figure 1. The Select and WE inputs are fed into the internal controller, which is responsible for selecting which data stream to pass through the device. The output signal passes through the active clamp resistors, whose purpose is to provide additional protection against electrostatic discharge, and the depletion devices, which prevent signal latch-up.

The actual switching process itself is implemented using an internal buffer, as seen in Figure 2. The buffer is transparent when the Select and WE pins are both low, and the output signal is passed straight through unaffected. When either the Select or WE pin is high, the buffer is activated and the output signal is selected from the corresponding data stream.In summary, the MC74VHC157DTR2 is a high performance Quad 2-To-1 Data Selector/Multiplexer/Demultiplexer that is suitable for a wide range of applications such as data communication, data buffering, and signal routing. It features a wide supply voltage range, low On and Off leakage currents, and an internal buffer to provide fault protection. With its impressive features and performance, the MC74VHC157DTR2 is an excellent choice for anyone looking for an efficient and reliable solution to data routing issues.

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