74HCT646D,653

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Bus Transceiver
• Characteristics: High-speed, CMOS technology, 3-state outputs
• Package: SOIC (Small Outline Integrated Circuit)
• 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 Drive Capability: ±6mA at 4.5V
• Propagation Delay: 9ns (typical)

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. B0-B7 (Data Bus) - Octal Data Bus Inputs/Outputs
11. A0-A7 (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 buses
• 3-state outputs for bus isolation
• Active Low Output Enable (OE) for controlling the output state
• Direction Control (DIR) for selecting the data flow direction

Advantages and Disadvantages

Advantages: - High-speed operation - CMOS technology for low power consumption - Bidirectional data transfer capability - 3-state outputs for bus isolation

Disadvantages: - Limited supply voltage range (4.5V to 5.5V) - Propagation delay of 9ns may not be suitable for certain high-speed applications

Working Principles

The 74HCT646D,653 is a bidirectional octal bus transceiver that allows data transfer between two buses in both directions. The direction of data flow is controlled by the DIR pin. When DIR is set to logic high, data flows from A bus to B bus, and when DIR is set to logic low, data flows from B bus to A bus. The OE pin is used to enable or disable the outputs. When OE is set to logic low, the outputs are enabled and data can be transmitted. Conversely, when OE is set to logic high, the outputs are disabled and the bus is isolated.

Detailed Application Field Plans

The 74HCT646D,653 is commonly used in various applications where bidirectional data transfer between two buses is required. Some of the typical application fields include: - Data communication systems - Industrial automation - Automotive electronics - Networking equipment - Microcontroller interfacing

Detailed and Complete Alternative Models

• SN74HCT646D - Similar octal bus transceiver with 3-state outputs, offered by Texas Instruments.
• MC74HCT646N - Octal bus transceiver with 3-state outputs, provided by ON Semiconductor.
• CD74HCT646E - Equivalent octal bus transceiver with 3-state outputs, manufactured by Texas Instruments.

(Note: The above alternative models are provided for reference and may have slight variations in specifications and pin configuration. It is recommended to refer to the respective datasheets for detailed information.)

This entry provides an overview of the 74HCT646D,653, including its basic information, specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models. With its bidirectional data transfer capability and 3-state outputs, this IC finds applications in various industries requiring efficient bus transceivers.