CD74HCT257M

Product Overview

• Category: Integrated Circuit (IC)
• Use: Multiplexer
• Characteristics: High-speed, CMOS logic, 4-channel multiplexer
• Package: 16-pin SOIC (Small Outline Integrated Circuit)
• Essence: Logic IC for data selection and routing
• Packaging/Quantity: Tape and reel packaging, 2500 units per reel

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 15 ns (typical)
• Maximum Quiescent Current: 4µA
• Maximum Output Current: ±25mA

Detailed Pin Configuration

The CD74HCT257M has a total of 16 pins. The pin configuration is as follows:

1. A0 - Channel A Data Input
2. A1 - Channel B Data Input
3. A2 - Channel C Data Input
4. A3 - Channel D Data Input
5. GND - Ground
6. Y - Multiplexer Output
7. E - Enable Input
8. B - Select Input
9. C - Select Input
10. D - Select Input
11. VCC - Positive Power Supply
12. NC - No Connection
13. NC - No Connection
14. NC - No Connection
15. NC - No Connection
16. NC - No Connection

Functional Features

• 4-channel multiplexer with common enable input
• High-speed operation suitable for various applications
• CMOS technology ensures low power consumption
• Wide operating voltage range allows compatibility with different systems
• Schmitt-trigger inputs provide noise immunity

Advantages and Disadvantages

Advantages: - High-speed operation - Low power consumption - Wide operating voltage range - Noise immunity due to Schmitt-trigger inputs

Disadvantages: - Limited number of channels (4 channels) - No built-in protection against overvoltage or ESD

Working Principles

The CD74HCT257M is a multiplexer IC that selects one of the four input channels and routes it to the output based on the select inputs. The enable input controls the operation of the multiplexer. When the enable input is high, the multiplexer is active, and the selected channel's data is passed to the output. When the enable input is low, the multiplexer is disabled, and the output remains in a high-impedance state.

Detailed Application Field Plans

The CD74HCT257M can be used in various applications, including:

1. Data routing and selection in digital systems
2. Address decoding in memory systems
3. Input/output expansion in microcontroller-based systems
4. Signal routing in communication systems
5. Multiplexing control signals in industrial automation

Detailed and Complete Alternative Models

Some alternative models to the CD74HCT257M include:

1. 74HC257 - Similar functionality but operates at a lower voltage range (2V to 6V)
2. CD4051 - 8-channel analog multiplexer/demultiplexer
3. SN74LS151 - 8-input digital multiplexer with priority encoding

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

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