MC74ACT245MELG

Product Overview

• Category: Integrated Circuit
• Use: Signal Level Shifter
• Characteristics: High-Speed, Non-Inverting, Octal Bus Transceiver
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Transfers data between two bidirectional bus systems operating at different voltage levels
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Logic Family: ACT
• Number of Channels: 8
• Input Voltage Range: 2.0V to 6.0V
• Output Voltage Range: 2.0V to 6.0V
• Propagation Delay: 7ns (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

1. A1: Channel 1 Data Input/Output
2. B1: Channel 2 Data Input/Output
3. GND: Ground
4. A2: Channel 3 Data Input/Output
5. B2: Channel 4 Data Input/Output
6. VCC: Power Supply
7. B3: Channel 5 Data Input/Output
8. A3: Channel 6 Data Input/Output
9. OE: Output Enable
10. DIR: Direction Control
11. B4: Channel 7 Data Input/Output
12. A4: Channel 8 Data Input/Output

Functional Features

• Bidirectional data transfer between two buses with different voltage levels
• Non-inverting logic ensures the same polarity of data on both sides
• High-speed operation for efficient data transmission
• Output enable and direction control for flexible control over data flow

Advantages and Disadvantages

Advantages: - Allows interfacing between different voltage level systems - Non-inverting logic preserves data integrity - High-speed operation for quick data transfer

Disadvantages: - Limited to 8 channels, may not be suitable for applications requiring more channels - Requires careful consideration of voltage compatibility between the two bus systems

Working Principles

The MC74ACT245MELG is an octal bus transceiver designed to facilitate data transfer between two bidirectional bus systems operating at different voltage levels. It employs non-inverting logic, ensuring that the polarity of the data remains the same on both sides.

The device features a direction control pin (DIR) that determines the direction of data flow and an output enable pin (OE) that enables or disables the outputs. By controlling these pins, the user can regulate the data transfer between the two buses.

When the DIR pin is set to transmit mode, data from the A-side is transferred to the B-side, and vice versa when in receive mode. The OE pin allows the user to enable or disable the outputs, providing flexibility in controlling the data flow.

Detailed Application Field Plans

The MC74ACT245MELG is commonly used in various applications where there is a need to interface between two bus systems operating at different voltage levels. Some typical application fields include:

1. Microcontroller interfacing with external memory modules
2. Communication interfaces between different devices with varying voltage requirements
3. Level shifting in mixed-signal circuit designs
4. Data transfer between different logic families

Detailed and Complete Alternative Models

1. SN74ACT245: Similar octal bus transceiver from Texas Instruments
2. CD74ACT245: Octal non-inverting bus transceiver from Texas Instruments
3. 74HCT245: Octal bus transceiver with voltage level translation from NXP Semiconductors

These alternative models offer similar functionality and can be considered as substitutes for the MC74ACT245MELG based on specific application requirements.

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