74HCT646DB,112

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Bus Transceiver
• Characteristics: High-speed, CMOS technology, TTL compatibility
• Package: SSOP (Shrink Small Outline Package)
• Essence: Bidirectional octal bus transceiver with 3-state outputs
• Packaging/Quantity: Tape and reel, 2500 units per reel

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +125°C
• Output Current: ±6mA
• Propagation Delay Time: 10ns (max)
• Output Capacitance: 10pF (typ)

Detailed Pin Configuration

1. OE (Output Enable) - Active Low Output Enable
2. DIR (Direction Control) - Direction Control Input
3. A0-A7 (Data Bus) - Octal Data Bus Inputs/Outputs
4. B0-B7 (Data Bus) - Octal Data Bus Inputs/Outputs
5. GND (Ground) - Ground Reference
6. VCC (Supply Voltage) - Positive Power Supply
7. NC (No Connection) - No Internal Connection
8. OE (Output Enable) - Active Low Output Enable
9. DIR (Direction Control) - Direction Control Input
10. A0-A7 (Data Bus) - Octal Data Bus Inputs/Outputs
11. B0-B7 (Data Bus) - Octal Data Bus Inputs/Outputs
12. GND (Ground) - Ground Reference
13. VCC (Supply Voltage) - Positive Power Supply
14. NC (No Connection) - No Internal Connection

Functional Features

• Bidirectional data transfer between two independent buses
• 3-state outputs for bus isolation
• TTL compatibility for easy integration with existing systems
• High-speed operation for efficient data transmission

Advantages and Disadvantages

Advantages: - Allows bidirectional communication between buses - Provides bus isolation through 3-state outputs - Compatible with TTL logic levels - High-speed operation enables fast data transfer

Disadvantages: - Limited output current capacity - Requires external pull-up resistors for proper operation

Working Principles

The 74HCT646DB,112 is a bidirectional octal bus transceiver that allows data transfer between two independent buses. The direction of data flow is controlled by the DIR pin. When DIR is high, data is transferred from A bus to B bus, and when DIR is low, data is transferred from B bus to A bus. The OE pin is used to enable or disable the outputs. When OE is low, the outputs are active, and when OE is high, the outputs are in a high-impedance state.

Detailed Application Field Plans

• Interfacing between microcontrollers and peripheral devices
• Data communication between different modules in a system
• Bus communication in industrial automation systems
• Networking equipment and telecommunications applications

Detailed and Complete Alternative Models

• 74HCT245: Octal bus transceiver with non-inverting 3-state outputs
• 74HCT640: Octal bus transceiver with inverting 3-state outputs
• 74HCT541: Octal buffer/line driver with 3-state outputs
• 74HCT573: Octal transparent latch with 3-state outputs

(Note: These alternative models have similar functionality but may differ in specific features or pin configurations.)

This entry provides an overview of the 74HCT646DB,112 integrated circuit, including its basic information, specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models. With its bidirectional bus transceiver capabilities and high-speed operation, this IC is widely used in various applications requiring efficient data transfer between buses.