DM74AS245N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Bus Transceiver
• Characteristics: High-speed, bidirectional data transfer between buses of different voltage levels
• Package: DIP (Dual In-line Package)
• Essence: Transfers data between two buses with different voltage levels while maintaining signal integrity
• Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier

Specifications

• Supply Voltage: 4.5V to 5.5V
• Input Voltage Levels: TTL-compatible
• Output Voltage Levels: TTL-compatible
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 10ns (typical)
• Output Current: ±24mA
• Number of Pins: 20

Detailed Pin Configuration

1. A1: Bus A Data Input/Output
2. B1: Bus B Data Input/Output
3. A2: Bus A Enable Input
4. B2: Bus B Enable Input
5. GND: Ground
6. B3: Bus B Direction Control
7. B4: Bus B Data Input/Output
8. B5: Bus B Data Input/Output
9. B6: Bus B Data Input/Output
10. VCC: Supply Voltage
11. A7: Bus A Data Input/Output
12. A6: Bus A Data Input/Output
13. A5: Bus A Data Input/Output
14. A4: Bus A Data Input/Output
15. A3: Bus A Data Input/Output
16. OE: Output Enable Input
17. DIR: Direction Control Input
18. B7: Bus B Data Input/Output
19. B8: Bus B Data Input/Output
20. A8: Bus A Data Input/Output

Functional Features

• Bidirectional data transfer between two buses with different voltage levels
• TTL-compatible input and output voltage levels
• High-speed operation with low propagation delay time
• Output enable and direction control inputs for flexible control
• Robust design for reliable performance in various applications

Advantages and Disadvantages

Advantages

• Efficient and reliable data transfer between buses of different voltage levels
• High-speed operation allows for quick data transmission
• TTL compatibility ensures compatibility with a wide range of devices
• Flexible control options with output enable and direction control inputs

Disadvantages

• Limited to bidirectional data transfer only
• Requires careful consideration of voltage level compatibility between the two buses

Working Principles

The DM74AS245N is a bus transceiver that enables bidirectional data transfer between two buses with different voltage levels. It utilizes TTL-compatible input and output voltage levels, allowing seamless integration with various devices. The device features an output enable input (OE) and a direction control input (DIR), which provide flexibility in controlling the data flow.

When the OE input is high, the device is enabled, and data can be transferred between the two buses. The DIR input determines the direction of data flow. When DIR is low, data is transferred from Bus A to Bus B, and when DIR is high, data is transferred from Bus B to Bus A.

The DM74AS245N ensures reliable and efficient data transfer by maintaining signal integrity and minimizing propagation delay. It is designed to operate within a specified temperature range and can handle high-speed data transmission.

Detailed Application Field Plans

The DM74AS245N finds applications in various fields where bidirectional data transfer between buses of different voltage levels is required. Some common application areas include:

1. Embedded Systems: Used in microcontroller-based systems to interface with peripherals operating at different voltage levels.
2. Communication Systems: Facilitates data exchange between different communication protocols or interfaces.
3. Industrial Automation: Enables communication between devices operating at different voltage levels in industrial control systems.
4. Automotive Electronics: Used in automotive applications for connecting sensors, actuators, and control units with different voltage requirements.
5. Test and Measurement Equipment: Allows for seamless data transfer between instruments with varying voltage levels.

Detailed and Complete Alternative Models

1. SN74AS245: Similar functionality and specifications, available in a different package (SOIC).
2. 74HC245: CMOS-based bus transceiver with similar functionality but operates at lower voltage levels.
3. CD74HCT245: High-speed CMOS bus transceiver with TTL-compatible inputs and outputs.

These alternative models provide similar functionality to the DM74AS245N but may have differences in voltage levels, speed, or package options. It is important to select the appropriate model based on specific application requirements.

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