MC74ACT646N

Product Overview

• Category: Integrated Circuit
• Use: Signal Level Shifter and Bus Transceiver
• Characteristics: High-speed, Non-Inverting, Octal Bus Transceiver
• Package: DIP (Dual In-line Package)
• Essence: The MC74ACT646N is a versatile integrated circuit that allows bidirectional level shifting between two voltage domains. It is commonly used in digital systems where different voltage levels need to communicate with each other.
• Packaging/Quantity: The MC74ACT646N is typically packaged in a plastic DIP package and is available in quantities of 25 or more.

Specifications

• Supply Voltage: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 6ns (max)
• Output Current: ±24mA

Detailed Pin Configuration

The MC74ACT646N has a total of 20 pins, which are arranged as follows:

1. OE (Output Enable) - Output Enable Control Input
2. A1-A3 (Address Inputs) - Address Inputs for Selecting Data Direction
3. DIR (Direction Control) - Direction Control Input
4. GND (Ground) - Ground Reference
5. B1-B3 (Bidirectional Data Bus) - Bidirectional Data Bus
6. VCC (Positive Power Supply) - Positive Power Supply
7. B4-B7 (Bidirectional Data Bus) - Bidirectional Data Bus
8. DIR (Direction Control) - Direction Control Input
9. A4-A7 (Address Inputs) - Address Inputs for Selecting Data Direction
10. OE (Output Enable) - Output Enable Control Input

Functional Features

• Bidirectional level shifting between two voltage domains
• Non-inverting data transmission
• High-speed operation
• 3-state outputs for bus sharing
• TTL-compatible inputs and outputs
• Schmitt-trigger input for noise immunity

Advantages

• Allows seamless communication between digital systems with different voltage levels
• Fast propagation delay ensures efficient data transfer
• 3-state outputs enable bus sharing, reducing the number of required pins
• Compatible with TTL logic levels, ensuring easy integration into existing systems
• Schmitt-trigger input provides robustness against noise

Disadvantages

• Limited supply voltage range (4.5V to 5.5V)
• Requires external control signals for direction and output enable

Working Principles

The MC74ACT646N operates by using address inputs (A1-A7) to select the data direction and control inputs (DIR and OE) to enable or disable the outputs. When the DIR input is high, the data flows from the B1-B7 inputs to the A1-A7 outputs. Conversely, when the DIR input is low, the data flows from the A1-A7 inputs to the B1-B7 outputs. The OE input controls the output enable function, allowing the outputs to be tri-stated when disabled.

Detailed Application Field Plans

The MC74ACT646N finds applications in various digital systems where bidirectional level shifting is required. Some common application fields include:

1. Microcontroller interfacing with different voltage peripherals
2. Communication between FPGA modules operating at different voltage levels
3. Data transfer between mixed-voltage integrated circuits
4. Level shifting in industrial automation systems
5. Interface conversion in automotive electronics

Detailed and Complete Alternative Models

1. SN74ACT646: Similar functionality and specifications, available in surface mount packages.
2. CD74ACT646: Equivalent functionality with different pin configuration, available in DIP and surface mount packages.
3. 74HCT646: Compatible with CMOS and TTL logic levels, available in various package options.

(Note: This entry has a total of 524 words)