SN74HC251DR

Product Overview

• Category: Integrated Circuit
• Use: Data Selector/Multiplexer
• Characteristics:
  • High-speed operation
  • Low power consumption
  • Wide operating voltage range
  • Multiple input/output options
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: SN74HC251DR is a data selector/multiplexer integrated circuit that allows the selection of one out of eight data inputs based on the control signals.
• Packaging/Quantity: Available in reels with 2500 units per reel.

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 10 ns (typical)
• Maximum Quiescent Current: 4µA

Pin Configuration

The SN74HC251DR has a total of 16 pins. The pin configuration is as follows:

1. A0: Data Input 0
2. A1: Data Input 1
3. A2: Data Input 2
4. A3: Data Input 3
5. A4: Data Input 4
6. A5: Data Input 5
7. A6: Data Input 6
8. A7: Data Input 7
9. GND: Ground
10. Y: Multiplexed Output
11. S0: Selection Control Input 0
12. S1: Selection Control Input 1
13. OE: Output Enable Input
14. VCC: Power Supply
15. NC: No Connection
16. NC: No Connection

Functional Features

• Data selection: Allows the selection of one out of eight data inputs based on the control signals.
• Multiplexing: Provides a single output that can be connected to any of the eight data inputs.
• Output enable: Allows the output to be enabled or disabled based on the OE input signal.

Advantages and Disadvantages

Advantages: - High-speed operation allows for quick data selection. - Low power consumption helps in reducing overall power requirements. - Wide operating voltage range provides flexibility in different applications. - Multiple input/output options offer versatility in data selection.

Disadvantages: - Limited number of data inputs (eight) may not be sufficient for certain complex applications. - Propagation delay time may affect real-time applications requiring immediate data selection.

Working Principles

The SN74HC251DR works by using the selection control inputs (S0 and S1) to determine which data input (A0-A7) is connected to the output (Y). The output enable input (OE) controls whether the output is active or disabled. When OE is low, the output follows the selected data input. When OE is high, the output is disabled.

Detailed Application Field Plans

The SN74HC251DR can be used in various applications, including:

1. Data multiplexing in communication systems
2. Address decoding in memory systems
3. Input selection in microcontroller-based systems
4. Data routing in digital signal processing
5. Control signal selection in industrial automation

Alternative Models

Some alternative models that provide similar functionality to SN74HC251DR are:

1. CD74HC251E
2. MC74HC251N
3. 74HCT251

These models have comparable specifications and pin configurations, making them suitable alternatives for different design requirements.

In conclusion, the SN74HC251DR is a versatile data selector/multiplexer integrated circuit with high-speed operation, low power consumption, and multiple input/output options. It finds applications in various fields, including communication systems, memory systems, and industrial automation. Alternative models are available to cater to different design needs.