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DM74251N Application Field and Working Principle

The DM74251N is a logic-signal switch, multiplexer, and decoder IC (Integrated Circuit) produced by the Fairchild Semiconductor Corporation. It is a 16-pin, quad 2-input multiplexer. The IC is ideally suited for general-purpose switching and signal routing applications. It also finds use as a low-cost data selector in systems requiring a high level of isolation between input/outputs.

General Description

The DM74251N is a quad 2-input multiplexer logic signal switch that combines four switches with four 2-to-1 binary selectors. All four switching outputs are enabled, regardless of the input state. This allows the multiplexer to select from one of two signal sources. The IC is designed to switch digital signals, with a minimum operating voltage of 2V and a maximum operating voltage of 6V. It also works with TTL, CMOS, and LSTTL logic families.

Features

• Four 2-input logic switches
• Four 2-to-1 binary selectors
• High channel-to-channel Isolation
• Low On-state resistance
• Low power consumption
• Compatible with most logic families
• High switching speed

Pinouts of the IC

The DM74251N is a 16-pin IC, with the pins labeled from 1 to 16. It has four multiplexers, each containing four input pins that should be connected to the appropriate logic source. The output of the multiplexer is connected to the 16th pin, which is labeled OUT. The 2-to-1 selectors have their input pins labeled S1 and S2, with their output connected to the 14th pin, which is labeled SEL. Finally, the enable pins are labeled E1 and E2, with their outputs connected to the 15th and 16th pins, respectively.

Functionality

The DM74251N is a chip that serves 3 parallel functions – acting as a logic-signal switch, multiplexer, and a decoder IC. It is a 16-pin IC made up of four 2-input multiplexers and four 2-to-1 binary selectors. The 4 multiplexers are used for general-purpose switching and for passing signals from one point to another. Each multiplexer contains four input pins that should be connected to the appropriate logic source. The output of the multiplexer is connected to the 6th pin, which is labeled OUT. Each 2-to-1 selector is used to select one of two input sources, depending on which input is activated. The input pins of the selector are labeled S1 and S2, with the output connected to the 4th pin, which is labeled SEL. Finally, the enable pins are labeled E1 and E2, with their outputs connected to the 5th and 6th pins, respectively.

Applications

The DM74251N is ideally suited for switching and routing digital signals in applications such as computers, clock generators, arithmetic units, memory nodes, etc. Its low-power consumption, high speed, and low propagation delay makes it well-suited for these uses. Also, because of its low On-state resistance and high channel-to-channel isolation, it is perfect for data selectors in systems with high isolation requirements between input/outputs. It can also be used as a fast and cost-efficient real-time multiplexer.

Conclusion

The DM74251N is a versatile logic-signal switch, multiplexer, and decoder IC produced by the Fairchild Semiconductor Corporation. It is a 16-pin IC made up of four 2-input multiplexers and four 2-to-1 binary selectors. The IC is designed to switch digital signals, with a minimum and a maximum operating voltage of 2V and 6V, respectively. It is best suited for general-purpose switching and signal routing, data selector applications with high level of isolation, and as a fast and cost-efficient multiplexer in real-time systems.

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