DM74LS157N

Product Overview

Category

DM74LS157N belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronics for data multiplexing applications.

Characteristics

• DM74LS157N is a quad 2-input multiplexer with complementary outputs.
• It operates on a supply voltage range of 4.75V to 5.25V.
• The IC has a low power consumption and high noise immunity.
• It is designed to work in harsh environments with a wide temperature range.

Package

DM74LS157N is available in a 16-pin DIP (Dual In-line Package) format.

Essence

The essence of DM74LS157N lies in its ability to select one of four data inputs and route it to a single output line based on the control inputs.

Packaging/Quantity

DM74LS157N is typically packaged in tubes or trays, with each containing a quantity of 25 ICs.

Specifications

• Supply Voltage Range: 4.75V to 5.25V
• Input Voltage Range: 0V to Vcc
• Output Voltage Range: 0V to Vcc
• Operating Temperature Range: -55°C to +125°C
• Propagation Delay Time: 15ns (max)
• Power Dissipation: 400mW (max)

Detailed Pin Configuration

+---+--+---+ A1 -|1 +--+ 16|- Vcc B1 -|2 15|- Y C1 -|3 14|- B D1 -|4 13|- A GND -|5 12|- C A0 -|6 11|- D B0 -|7 10|- G1 C0 -|8 9|- G2 +----------+

Functional Features

• DM74LS157N has four data inputs (A, B, C, D) and two control inputs (G1, G2).
• The control inputs determine which data input is selected and routed to the output (Y).
• When both G1 and G2 are low, the Y output follows the A input.
• Depending on the combination of G1 and G2, the other data inputs can be selected.

Advantages and Disadvantages

Advantages

• High noise immunity due to Schottky-clamped TTL inputs.
• Low power consumption makes it suitable for battery-powered applications.
• Wide operating temperature range allows usage in extreme environments.
• Compact package size enables easy integration into circuit designs.

Disadvantages

• Limited number of data inputs (only four).
• Propagation delay time may affect real-time applications with strict timing requirements.

Working Principles

DM74LS157N operates based on the principle of multiplexing. It selects one of the four data inputs and routes it to the output line based on the control inputs. The control inputs determine the logic levels required to activate the desired data input. The selected data input is then passed through internal logic gates to generate the output signal.

Detailed Application Field Plans

DM74LS157N finds applications in various digital systems, including but not limited to: - Data routing and selection in microprocessors and microcontrollers. - Address decoding in memory systems. - Input/output (I/O) expansion in embedded systems. - Multiplexing of control signals in communication systems.

Detailed and Complete Alternative Models

Some alternative models that serve similar functions to DM74LS157N include: - SN74LS157 - CD74HC157 - MC74HC157 - 74F157

These alternative models offer similar functionality but may have different specifications, pin configurations, or package formats. It is important to refer to the respective datasheets for detailed information on each alternative model.

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