CD74AC251M

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics: High-speed, low-power, 8-input multiplexer
• Package: 16-pin SOIC (Small Outline Integrated Circuit)
• Essence: CD74AC251M is a versatile multiplexer that allows selection of one out of eight data inputs based on the control signals.
• Packaging/Quantity: Available in reels of 2500 units or tubes of 50 units.

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature: -40°C to +85°C
• Propagation Delay: 5ns typical at 5V
• Input Capacitance: 3pF typical
• Output Current: ±24mA

Pin Configuration

The CD74AC251M has a total of 16 pins. The pin configuration is as follows:

1. A0: Input A0
2. A1: Input A1
3. A2: Input A2
4. A3: Input A3
5. A4: Input A4
6. A5: Input A5
7. A6: Input A6
8. A7: Input A7
9. GND: Ground
10. Y: Output Y
11. S0: Select Input S0
12. S1: Select Input S1
13. S2: Select Input S2
14. OE: Output Enable
15. VCC: Supply Voltage
16. NC: No Connection

Functional Features

• CD74AC251M is a high-speed CMOS multiplexer with 8 data inputs and 1 output.
• It allows selection of one input from the eight available based on the control signals S0, S1, and S2.
• The output Y follows the selected input when the Output Enable (OE) is active.
• The device operates at a wide supply voltage range of 2V to 6V, making it suitable for various applications.

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient data selection.
• Low-power consumption makes it suitable for battery-powered devices.
• Wide supply voltage range provides flexibility in different applications.
• Compact 16-pin SOIC package offers space-saving integration.

Disadvantages

• Limited to 8 data inputs, which may not be sufficient for certain complex systems.
• Propagation delay of 5ns may introduce slight latency in time-critical applications.

Working Principles

The CD74AC251M is a multiplexer that uses control signals (S0, S1, and S2) to select one out of eight data inputs (A0 to A7). When the appropriate control signals are applied, the selected input is routed to the output pin (Y). The Output Enable (OE) signal determines whether the output is active or in a high-impedance state.

Detailed Application Field Plans

CD74AC251M can be used in various applications, including:

1. Data routing and selection in digital systems.
2. Address decoding in memory systems.
3. Input selection in microcontrollers and microprocessors.
4. Signal multiplexing in communication systems.
5. Channel selection in audio/video equipment.

Alternative Models

Here are some alternative models that offer similar functionality:

1. SN74HC151: 8-input multiplexer with 3-state outputs.
2. CD4051B: 8-channel analog multiplexer/demultiplexer.
3. MC14051B: 8-channel analog multiplexer/demultiplexer with latch.

These alternative models can be considered based on specific application requirements and availability.

In conclusion, the CD74AC251M is a versatile and high-speed 8-input multiplexer that finds applications in various digital systems. Its compact package, low-power consumption, and wide supply voltage range make it suitable for different electronic designs.