SN74LS257BNG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics: TTL Logic, Quad 2-Line to 1-Line Data Selector/Multiplexer
• Package: DIP-16 (Dual In-line Package with 16 pins)
• Essence: This IC is designed to select one of four data inputs and route it to a single output line based on the control inputs.
• Packaging/Quantity: Available in tubes or reels, with a quantity of 25 units per tube/reel.

Specifications

• Logic Family: LS-TTL (Low-Power Schottky Transistor-Transistor Logic)
• Number of Inputs: 4 (A, B, C, D)
• Number of Outputs: 1 (Y)
• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 15ns (typical)
• Power Dissipation: 22mW (typical)

Pin Configuration

The SN74LS257BNG4 has a total of 16 pins arranged as follows:

+---+--+---+ A --|1 +--+ 16|-- Vcc B --|2 15|-- Y C --|3 14|-- C D --|4 13|-- B GND --|5 12|-- A Y --|6 11|-- G2 G1 --|7 10|-- G3 OE --|8 9|-- G4 +----------+

Functional Features

• Quad 2-line to 1-line data selector/multiplexer
• Selects one of the four data inputs (A, B, C, D) based on control inputs (G1, G2, G3, G4)
• Output (Y) reflects the selected input
• Output enable (OE) pin allows for tri-state output

Advantages and Disadvantages

Advantages: - LS-TTL logic provides low-power consumption - Compact DIP-16 package allows for easy integration into various circuits - Wide operating temperature range (-40°C to +85°C) makes it suitable for different environments

Disadvantages: - Limited number of inputs and outputs (4:1 multiplexer) - Propagation delay time may affect high-speed applications

Working Principles

The SN74LS257BNG4 is a 4:1 data selector/multiplexer. It selects one of the four data inputs (A, B, C, D) based on the control inputs (G1, G2, G3, G4). The selected input is then routed to the output pin (Y). The output enable (OE) pin allows for tri-state output, enabling multiple devices to share a common bus.

Detailed Application Field Plans

The SN74LS257BNG4 can be used in various applications, including: 1. Data routing and selection in digital systems 2. Address decoding in memory systems 3. Input/output (I/O) expansion in microcontrollers 4. Multiplexing multiple signals onto a single line

Alternative Models

Here are some alternative models that can be considered as replacements for the SN74LS257BNG4: - CD4051B: 8-channel analog multiplexer/demultiplexer - 74HC153: Dual 4-input multiplexer - SN74HC238: 3-to-8 line decoder/demultiplexer

These alternative models offer similar functionality and can be used as substitutes depending on specific requirements.

In conclusion, the SN74LS257BNG4 is a quad 2-line to 1-line data selector/multiplexer IC. It provides a compact and efficient solution for data routing and selection in various digital systems. With its low-power consumption and wide operating temperature range, it is suitable for a range of applications.