Encyclopedia Entry: 74AC648SPC

Product Overview

• Category: Integrated Circuit (IC)
• Use: Digital Logic Level Shifter
• Characteristics: High-speed, low-power consumption, voltage level translation
• Package: DIP (Dual In-line Package)
• Essence: Translates logic levels between different voltage domains
• Packaging/Quantity: Available in tubes of 25 units or reels of 1000 units

Specifications

• Supply Voltage: 2.0V to 6.0V
• Logic Family: Advanced CMOS (AC)
• Number of Channels: 8
• Input Voltage Levels: TTL/CMOS compatible
• Output Voltage Levels: TTL/CMOS compatible
• Propagation Delay: 5 ns (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The 74AC648SPC IC has a total of 20 pins, which are assigned as follows:

Pin 1: GND (Ground) Pin 2: A1 (Channel 1 Input) Pin 3: B1 (Channel 1 Output) Pin 4: OE1 (Channel 1 Output Enable) Pin 5: VCC (Positive Power Supply) Pin 6: A2 (Channel 2 Input) Pin 7: B2 (Channel 2 Output) Pin 8: OE2 (Channel 2 Output Enable) Pin 9: A3 (Channel 3 Input) Pin 10: B3 (Channel 3 Output) Pin 11: OE3 (Channel 3 Output Enable) Pin 12: A4 (Channel 4 Input) Pin 13: B4 (Channel 4 Output) Pin 14: OE4 (Channel 4 Output Enable) Pin 15: A5 (Channel 5 Input) Pin 16: B5 (Channel 5 Output) Pin 17: OE5 (Channel 5 Output Enable) Pin 18: A6 (Channel 6 Input) Pin 19: B6 (Channel 6 Output) Pin 20: OE6 (Channel 6 Output Enable)

Functional Features

• Translates logic levels between different voltage domains, allowing interfacing between devices operating at different voltage levels.
• Provides bidirectional level shifting for each channel, enabling seamless communication between systems with varying voltage requirements.
• Supports high-speed data transmission, making it suitable for applications requiring rapid signal translation.
• Low power consumption ensures efficient operation and minimizes energy usage.

Advantages and Disadvantages

Advantages: - Wide supply voltage range allows compatibility with various systems. - High-speed performance enables quick data transfer. - Low-power consumption reduces energy usage. - Bidirectional level shifting simplifies interfacing between different voltage domains.

Disadvantages: - Limited number of channels (8) may not be sufficient for complex systems requiring more connections. - Propagation delay of 5 ns (typical) may introduce slight delays in time-critical applications.

Working Principles

The 74AC648SPC utilizes advanced CMOS technology to perform voltage level translation. It consists of eight independent bidirectional channels, each capable of translating logic signals between two voltage domains. The IC operates by detecting the input voltage level and then shifting it to the corresponding output voltage level. This allows seamless communication between devices operating at different voltage levels.

Detailed Application Field Plans

The 74AC648SPC is commonly used in various applications, including: 1. Microcontroller interfacing with peripheral devices operating at different voltage levels. 2. Communication systems requiring level shifting between different logic families (e.g., TTL and CMOS). 3. Data transmission between systems with varying voltage requirements, such as industrial automation and automotive electronics. 4. Interface circuits in mixed-voltage systems, ensuring compatibility between different components.

Detailed and Complete Alternative Models

• 74LVC245: Octal Bus Transceiver with Voltage Level Translation
• SN74LV1T34: Single-Bit Dual-Supply Bus Buffer Gate with Level Shifting
• CD4504B: Hex Voltage-Level Shifter for TTL-to-CMOS or CMOS-to-CMOS Operation

These alternative models offer similar functionality to the 74AC648SPC and can be used as replacements depending on specific application requirements.

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