Encyclopedia Entry: 74ACT11245NT

Product Information Overview

• Category: Integrated Circuit (IC)
• Use: Signal Buffer/Driver
• Characteristics: High-speed, low-power, non-inverting, 3-state output
• Package: 48-pin plastic dual in-line package (PDIP)
• Essence: The 74ACT11245NT is a high-performance octal bus transceiver designed for asynchronous communication between two data buses. It provides bidirectional buffering and signal level translation.
• Packaging/Quantity: Available in reels of 2500 units or tubes of 25 units.

Specifications

• Supply Voltage: 4.5V to 5.5V
• Input Voltage Levels: 0V to VCC
• Output Voltage Levels: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 6ns (typical)
• Output Drive Capability: ±24mA
• Input Capacitance: 4pF (typical)

Detailed Pin Configuration

The 74ACT11245NT has a total of 48 pins, which are divided into various functional groups:

1. Group A (Pins 1-8): Data Bus A (D0-D7) Inputs/Outputs
2. Group B (Pins 9-16): Data Bus B (D0-D7) Inputs/Outputs
3. Group C (Pins 17-24): Control Inputs (OEAB, OEBA, DIR)
4. Group D (Pins 25-32): Power Supply and Ground Pins
5. Group E (Pins 33-40): Data Bus A (D0-D7) Outputs
6. Group F (Pins 41-48): Data Bus B (D0-D7) Outputs

Functional Features

• Bidirectional data transfer between two independent buses.
• Non-inverting outputs for both data buses.
• 3-state output control for bus isolation.
• High-speed operation suitable for high-performance systems.
• Low-power consumption for energy-efficient designs.
• Schmitt-trigger inputs for noise immunity.

Advantages and Disadvantages

Advantages: - Enables seamless communication between different data buses. - Provides signal level translation, allowing compatibility between systems with varying voltage levels. - Offers high-speed operation, making it suitable for time-critical applications. - Low-power consumption helps in reducing overall system energy requirements. - Schmitt-trigger inputs enhance noise immunity, ensuring reliable data transmission.

Disadvantages: - Limited to 8-bit data buses, may not be suitable for larger data transfers. - Requires careful consideration of power supply voltage range to ensure proper functionality. - The 48-pin package may occupy more space on the circuit board compared to smaller ICs.

Working Principles

The 74ACT11245NT operates by receiving data from one bus (Bus A) and transmitting it to another bus (Bus B), or vice versa. The direction of data flow is controlled by the DIR input pin. When the DIR pin is low, data flows from Bus A to Bus B, and when it is high, data flows from Bus B to Bus A. The OEAB and OEBA pins control the 3-state output buffers, enabling or disabling the output drivers.

Detailed Application Field Plans

The 74ACT11245NT finds applications in various fields, including:

1. Microprocessor-based systems
2. Data communication networks
3. Industrial automation
4. Automotive electronics
5. Consumer electronics

In microprocessor-based systems, it can be used for interfacing different buses operating at different voltage levels. In data communication networks, it facilitates data exchange between different protocols. In industrial automation and automotive electronics, it enables communication between various control modules. In consumer electronics, it can be utilized for signal buffering and level translation in multimedia devices.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the 74ACT11245NT include:

1. 74ACT245: Octal bus transceiver with 3-state outputs.
2. 74HC245: Octal bus transceiver with non-inverting outputs.
3. 74LS245: Octal bus transceiver with tri-state outputs.
4. SN74LVC4245A: Octal dual-supply bus transceiver with configurable voltage translation.

These alternatives provide options based on specific requirements such as voltage levels, power consumption, and output configurations.

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