CD74HC251M

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics: High-speed, CMOS logic, 8-input multiplexer
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: CD74HC251M is a versatile IC that allows the selection of one out of eight data inputs based on control signals.
• Packaging/Quantity: Available in reels or tubes, with varying quantities depending on the supplier.

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 50 MHz
• Propagation Delay: 13 ns (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The CD74HC251M has a total of 16 pins. The pin configuration is as follows:

1. A0 (Input)
2. A1 (Input)
3. A2 (Input)
4. A3 (Input)
5. A4 (Input)
6. A5 (Input)
7. A6 (Input)
8. A7 (Input)
9. GND (Ground)
10. Y (Output)
11. S0 (Control Input)
12. S1 (Control Input)
13. OE (Output Enable)
14. VCC (Supply Voltage)
15. B (Input)
16. C (Input)

Functional Features

• CD74HC251M is an 8-input multiplexer with three control inputs (S0, S1, and OE).
• It allows the selection of one out of eight data inputs (A0-A7) based on the control signals.
• The output (Y) reflects the selected input data.
• The output enable (OE) input controls the tri-state output, allowing for high impedance when disabled.

Advantages and Disadvantages

Advantages: - High-speed operation - Low power consumption - Wide supply voltage range - Easy to use and integrate into various digital circuits

Disadvantages: - Limited number of inputs (8) - Not suitable for applications requiring a larger number of inputs

Working Principles

The CD74HC251M operates based on CMOS logic principles. The control inputs (S0, S1, and OE) determine which data input (A0-A7) is selected. The selected data is then passed through internal circuitry and appears at the output pin (Y). The output enable (OE) input allows for enabling or disabling the output, providing flexibility in controlling the output state.

Detailed Application Field Plans

CD74HC251M finds applications in various digital systems where data selection from multiple sources is required. Some potential application fields include:

1. Data Multiplexing: CD74HC251M can be used to select data from different sources and route it to a common destination.
2. Address Decoding: It can be employed in address decoding circuits to select specific memory locations.
3. Input Selection: In microcontroller-based systems, CD74HC251M can be utilized to select inputs from multiple sensors or peripherals.
4. Signal Routing: It can be used in audio/video routing systems to select desired signals from multiple sources.

Detailed and Complete Alternative Models

1. CD74HC151E: 8-input multiplexer with similar characteristics and pin configuration.
2. SN74HC151N: Another alternative with the same functionality but a different package type (DIP).

These alternative models provide similar features and can be used as substitutes for CD74HC251M depending on specific requirements and availability.

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