DM74AS245WM

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Bus Transceiver
• Characteristics:
  • High-speed operation
  • Wide voltage range
  • Bidirectional data transfer
  • Non-inverting outputs
• Package: 20-pin SOIC (Small Outline Integrated Circuit)
• Essence: The DM74AS245WM is a bus transceiver IC that allows bidirectional data transfer between two buses with different voltage levels.
• Packaging/Quantity: Available in reels or tubes, typically sold in quantities of 100 or 250 units.

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 +85°C
• Maximum Propagation Delay: 15ns
• Maximum Output Current: ±24mA

Detailed Pin Configuration

The DM74AS245WM has a total of 20 pins, which are assigned specific functions as follows:

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

Functional Features

• Bidirectional Data Transfer: The DM74AS245WM allows data to be transferred bidirectionally between two buses, A and B.
• Non-Inverting Outputs: The outputs of the IC are non-inverting, ensuring that the data remains unchanged during transfer.
• High-Speed Operation: The IC is designed for high-speed operation, making it suitable for applications requiring fast data transfer.
• Wide Voltage Range: The DM74AS245WM supports a wide voltage range, allowing compatibility with different voltage levels.

Advantages and Disadvantages

Advantages: - Fast data transfer speeds - Wide voltage range compatibility - Non-inverting outputs preserve data integrity

Disadvantages: - Limited number of data lines (8 in total) - Requires external control signals for direction and output enable

Working Principles

The DM74AS245WM operates based on the principle of bidirectional data transfer. It uses internal circuitry to control the direction of data flow between the A and B buses. The DIR pin determines the direction of data transfer, while the OE pin enables or disables the outputs. When the DIR pin is set to a specific logic level, data can be transferred from bus A to bus B or vice versa. The OE pin controls whether the outputs are active or in a high-impedance state.

Detailed Application Field Plans

The DM74AS245WM is commonly used in various applications where bidirectional data transfer between buses with different voltage levels is required. Some typical application fields include: - Microcontroller interfacing - Data communication systems - Industrial automation - Automotive electronics - Networking equipment

Detailed and Complete Alternative Models

• SN74AS245: Similar bus transceiver IC from Texas Instruments
• 74HC245: Octal bus transceiver with 3-state outputs from various manufacturers
• CD74HCT245: High-speed CMOS logic level shifter from Texas Instruments

These alternative models offer similar functionality to the DM74AS245WM and can be used as replacements depending on specific requirements.

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