SN74AHC240DBRE4

Product Overview

• Category: Integrated Circuit
• Use: Buffer/Line Driver
• Characteristics: High-Speed, CMOS Logic, Octal Bus Buffer
• Package: SSOP (Shrink Small Outline Package)
• Essence: Buffering and driving signals in digital circuits
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 2 V to 5.5 V
• Input Voltage Range: 0 V to VCC
• Output Voltage Range: 0 V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 6 ns (typical)
• Output Current: ±8 mA
• Input Capacitance: 3.5 pF (typical)

Detailed Pin Configuration

The SN74AHC240DBRE4 has a total of 20 pins, which are divided into two rows of 10 pins each. The pin configuration is as follows:

Pin 1: Output Y1 Pin 2: Input A1 Pin 3: Input A2 Pin 4: GND (Ground) Pin 5: Input A3 Pin 6: Input A4 Pin 7: Input A5 Pin 8: VCC (Supply Voltage) Pin 9: Output Y2 Pin 10: Output Y3 Pin 11: Output Y4 Pin 12: Output Y5 Pin 13: Input A6 Pin 14: Input A7 Pin 15: Input A8 Pin 16: OE (Output Enable) Pin 17: Output Y6 Pin 18: Output Y7 Pin 19: Output Y8 Pin 20: GND (Ground)

Functional Features

• Octal buffer with 3-state outputs
• High-speed operation suitable for high-frequency applications
• CMOS technology provides low power consumption
• Output enable (OE) pin allows control of the output state
• Balanced propagation delays ensure signal integrity

Advantages and Disadvantages

Advantages: - High-speed operation enables efficient data transfer - Low power consumption extends battery life in portable devices - 3-state outputs allow multiple devices to share a bus - Wide supply voltage range enhances compatibility

Disadvantages: - Limited output current may restrict use in certain applications - Input and output voltage levels are limited to the supply voltage range - Sensitivity to electrostatic discharge (ESD) requires proper handling precautions

Working Principles

The SN74AHC240DBRE4 is an octal buffer that receives digital signals on its input pins and amplifies them to drive external loads. The buffer operates using complementary metal-oxide-semiconductor (CMOS) technology, which ensures high-speed performance and low power consumption.

The output enable (OE) pin controls the state of the outputs. When OE is low, the outputs are enabled and actively driven by the input signals. Conversely, when OE is high, the outputs are in a high-impedance state, allowing other devices to drive the bus.

The balanced propagation delays of the SN74AHC240DBRE4 ensure that all outputs switch simultaneously, minimizing any potential timing issues in the system.

Detailed Application Field Plans

The SN74AHC240DBRE4 is widely used in various digital systems where buffering and driving of signals are required. Some common application fields include:

1. Microcontrollers: The buffer can be used to interface microcontrollers with external devices, such as sensors, actuators, or displays.
2. Communication Systems: It can be employed in communication systems to amplify and drive signals between different modules or components.
3. Memory Systems: The buffer is useful in memory systems to ensure proper signal integrity during data transfers.
4. Industrial Automation: It finds applications in industrial automation systems for buffering and driving control signals.

Detailed and Complete Alternative Models

1. SN74AHC240N: DIP (Dual In-line Package) version of the same octal buffer.
2. SN74LVC240A: Low-voltage CMOS version with similar functionality.
3. SN74HCT240: High-speed CMOS version compatible with TTL logic levels.

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

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