CD74AC245E

Product Overview

• Category: Integrated Circuit
• Use: Level Shifting and Bus Transceiver
• Characteristics: High-Speed, Low-Power, Bidirectional
• Package: 20-pin DIP (Dual In-line Package)
• Essence: Transfers data between different voltage levels in digital systems
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage Levels: 0V to VCC
• Output Voltage Levels: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 5.8 ns (typical)
• Output Drive Capability: ±24 mA

Pin Configuration

The CD74AC245E has a total of 20 pins, which are labeled as follows:

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

Functional Features

• Bidirectional data transfer between two voltage domains
• High-speed operation suitable for fast digital systems
• Low-power consumption for energy-efficient designs
• Output enable control for flexible data flow management
• ESD (Electrostatic Discharge) protection for improved reliability

Advantages and Disadvantages

Advantages

• Allows interfacing between different voltage levels in digital systems
• Supports bidirectional data transfer, reducing the need for additional components
• High-speed operation enables efficient data transmission
• Low-power consumption helps conserve energy
• ESD protection enhances the reliability of the circuit

Disadvantages

• Limited to a maximum supply voltage of 6V
• Propagation delay may affect timing-sensitive applications
• Requires careful consideration of input and output voltage levels

Working Principles

The CD74AC245E is a level shifting and bus transceiver integrated circuit. It facilitates the transfer of data between digital systems operating at different voltage levels. The device features bidirectional data lines, allowing data to flow in both directions. The output enable pins control the direction of data flow.

When the output enable pin is active, data can be transmitted from the A-side to the B-side or vice versa. When the output enable pin is inactive, the data lines are in a high-impedance state, isolating the A-side and B-side.

The CD74AC245E operates by translating the logic levels of the input signals to the corresponding logic levels of the output signals. It ensures that the voltage levels are compatible between the two connected systems, enabling seamless communication.

Detailed Application Field Plans

The CD74AC245E is widely used in various applications where level shifting and bus transceiver functions are required. Some common application areas include:

1. Microcontroller interfacing with different voltage peripherals
2. Communication systems involving multiple voltage domains
3. Data acquisition systems with mixed signal levels
4. Industrial automation and control systems
5. Automotive electronics for signal translation between subsystems

Detailed and Complete Alternative Models

• SN74LVC245A: Low-Voltage CMOS Octal Bus Transceiver
• MC74VHC245: High-Speed CMOS Octal Bus Transceiver
• 74HCT245: High-Speed CMOS Octal Bus Transceiver with 3-State Outputs
• CD74ACT245: Advanced CMOS Octal Bus Transceiver

These alternative models offer similar functionality to the CD74AC245E and can be considered as alternatives based on specific design requirements.

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