SN74LS257BN

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics:
  • High-speed operation
  • Low power consumption
  • Wide operating voltage range
  • TTL compatible inputs
• Package: DIP (Dual In-line Package)
• Essence: The SN74LS257BN is a quad 2-input multiplexer with 3-state outputs.
• Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier.

Specifications

• Logic Family: LS-TTL
• Number of Inputs: 8 (4 data inputs and 4 select inputs)
• Number of Outputs: 4
• Output Type: 3-state
• Operating Voltage Range: 4.75V to 5.25V
• Propagation Delay Time: 9ns (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The SN74LS257BN has a 16-pin DIP package with the following pin configuration:

+---+--+---+ A0 --|1 +--+ 16|-- VCC A1 --|2 15|-- B3 A2 --|3 14|-- B2 A3 --|4 13|-- B1 GND --|5 12|-- B0 Y0 --|6 11|-- S3 Y1 --|7 10|-- S2 Y2 --|8 9|-- S1 +----------+

Functional Features

• Quad 2-input multiplexer: Allows selection of one out of four data inputs based on the select inputs.
• 3-state outputs: Provides high impedance state when not enabled, allowing multiple devices to share the same bus.
• TTL compatible inputs: Can be easily interfaced with other TTL logic devices.

Advantages and Disadvantages

Advantages: - High-speed operation: Enables fast data selection and processing. - Low power consumption: Helps in reducing overall power requirements. - Wide operating voltage range: Provides flexibility in various applications. - 3-state outputs: Allows for efficient bus sharing.

Disadvantages: - Limited number of inputs and outputs: May not be suitable for complex multiplexing requirements. - DIP package: Larger footprint compared to surface mount packages.

Working Principles

The SN74LS257BN operates as a multiplexer by selecting one of the four data inputs based on the select inputs. The selected input is then routed to the corresponding output. The 3-state outputs allow multiple devices to share the same bus without interfering with each other.

Detailed Application Field Plans

The SN74LS257BN can be used in various applications, including but not limited to: - Data routing and selection in digital systems - Address decoding in memory systems - Bus switching in computer architectures - Input/output (I/O) expansion in microcontrollers

Detailed and Complete Alternative Models

Some alternative models that serve similar functions to the SN74LS257BN are: - CD4051B: 8-channel analog multiplexer/demultiplexer - 74HC157: Quad 2-input multiplexer with non-inverting outputs - 74F157A: Quad 2-input multiplexer with 3-state outputs

These alternatives offer different features and specifications, allowing users to choose the most suitable option for their specific requirements.

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