MC74AC245NG

Overview

• Category: Integrated Circuit
• Use: Signal Level Shifter
• Characteristics: High-speed, Non-inverting, Octal Bus Transceiver
• Package: DIP (Dual In-line Package)
• Essence: Logic IC for voltage level translation
• Packaging/Quantity: Tube packaging, 25 pieces per tube

Specifications

• Supply Voltage Range: 2.0V to 6.0V
• High-Level Input Voltage: 2.0V to VCC
• Low-Level Input Voltage: GND to 0.8V
• High-Level Output Voltage: VCC - 0.5V
• Low-Level Output Voltage: 0.5V
• Maximum Operating Frequency: 30MHz
• Propagation Delay Time: 7ns (typical)

Pin Configuration

The MC74AC245NG has a total of 20 pins, which are assigned as follows:

1. OE (Output Enable) - Active LOW output enable input
2. An (n = 1 to 8) - Data input/output pins
3. GND - Ground
4. Bn (n = 1 to 8) - Data input/output pins
5. A0 - Data direction control pin
6. A1 - Data direction control pin
7. A2 - Data direction control pin
8. VCC - Positive power supply
9. DIR - Direction control input
10. B0 - Data input/output pin
11. B1 - Data input/output pin
12. B2 - Data input/output pin
13. B3 - Data input/output pin
14. B4 - Data input/output pin
15. B5 - Data input/output pin
16. B6 - Data input/output pin
17. B7 - Data input/output pin
18. GND - Ground
19. OE (Output Enable) - Active LOW output enable input
20. VCC - Positive power supply

Functional Features

• Non-inverting logic level translation between two voltage domains
• Bidirectional data transfer capability
• High-speed operation with low propagation delay
• Output enable control for disabling the outputs
• Direction control for selecting the data flow direction

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient data transfer - Non-inverting feature preserves signal integrity - Bidirectional capability simplifies circuit design - Output enable control provides flexibility in system integration

Disadvantages: - Limited operating frequency compared to some newer models - Requires external control signals for data direction and output enable

Working Principles

The MC74AC245NG is an octal bus transceiver that facilitates the translation of digital signals between two voltage domains. It operates by receiving data from one side and transmitting it to the other, while preserving the signal polarity. The direction of data flow is controlled by the DIR pin, and the outputs can be enabled or disabled using the OE pin.

Detailed Application Field Plans

The MC74AC245NG finds applications in various fields where voltage level translation is required. Some common application areas include:

1. Microcontroller interfacing with different voltage peripherals
2. Communication systems involving multiple voltage domains
3. Industrial automation and control systems
4. Data acquisition and processing systems
5. Automotive electronics

Alternative Models

1. SN74LV245A: Low-voltage Octal Bus Transceiver
2. CD74HCT245: High-Speed CMOS Logic Octal Bus Transceiver
3. 74HC245: High-Speed CMOS Logic Octal Bus Transceiver
4. SN74LVC245A: Low-Voltage CMOS Octal Bus Transceiver
5. CD74ACT245: High-Speed CMOS Logic Octal Bus Transceiver

These alternative models offer similar functionality and can be used as substitutes for the MC74AC245NG in various applications.

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