MC74HC245ADTR2

Product Overview

• Category: Integrated Circuit
• Use: Level Shifter/Transceiver
• Characteristics: High-Speed, CMOS Technology
• Package: TSSOP-20
• Essence: Bidirectional Transceiver
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature: -40°C to +85°C
• Propagation Delay: 13 ns (typical)
• Output Current: ±6 mA
• Input Capacitance: 3.5 pF (typical)
• Output Capacitance: 7 pF (typical)

Pin Configuration

The MC74HC245ADTR2 has a total of 20 pins, which are assigned as follows:

1. OE (Output Enable) - Active Low Output Enable
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 Input/Output Pin
6. A1 - Data Input/Output Pin
7. A2 - Data Input/Output Pin
8. A3 - Data Input/Output Pin
9. VCC - Positive Power Supply
10. DIR (Direction Control) - Direction Control Input
11. B3 - Data Input/Output Pin
12. B2 - Data Input/Output Pin
13. B1 - Data Input/Output Pin
14. B0 - Data Input/Output Pin
15. GND - Ground
16. B4 - Data Input/Output Pin
17. B5 - Data Input/Output Pin
18. B6 - Data Input/Output Pin
19. B7 - Data Input/Output Pin
20. VCC - Positive Power Supply

Functional Features

The MC74HC245ADTR2 is a bidirectional level shifter/transceiver that allows for the translation of signals between different voltage levels. It operates on CMOS technology, providing high-speed performance and low power consumption.

The device features an active-low output enable (OE) pin, which can be used to disable the outputs when not needed. The direction control (DIR) pin determines the direction of data flow, allowing for bidirectional communication.

Advantages and Disadvantages

Advantages: - High-speed operation - Low power consumption - Bidirectional functionality - Wide operating voltage range - Compact TSSOP-20 package

Disadvantages: - Limited output current capacity - Sensitivity to electrostatic discharge (ESD) - Not suitable for high-power applications

Working Principles

The MC74HC245ADTR2 works by utilizing a combination of CMOS technology and level shifting techniques. When the DIR pin is set to logic high, the device acts as a unidirectional level shifter, translating signals from the A-side (lower voltage) to the B-side (higher voltage) or vice versa.

When the DIR pin is set to logic low, the device functions as a bidirectional transceiver, allowing for the simultaneous transmission of data in both directions. The OE pin can be used to enable or disable the outputs, providing additional control over the data flow.

Detailed Application Field Plans

The MC74HC245ADTR2 is commonly used in various applications where level shifting and bidirectional communication are required. Some of the typical application fields include:

1. Microcontroller Interfacing: The device can be used to interface microcontrollers operating at different voltage levels, enabling seamless communication between them.

2. I/O Expansion: It can be employed to expand the input/output capabilities of a microcontroller or other digital devices by providing additional bidirectional data lines.

3. Bus Transceivers: The MC74HC245ADTR2 is suitable for implementing bus transceivers in systems where multiple devices need to communicate over a shared bus.

4. Logic Level Conversion: It can be utilized to convert logic levels between different families of integrated circuits, ensuring compatibility and proper signal transmission.

Detailed and Complete Alternative Models

1. SN74HCT245N: This is a similar bidirectional level shifter/transceiver from Texas Instruments, offering comparable specifications and functionality.

2. CD74HCT245E: Another alternative from Texas Instruments, this device provides bidirectional level shifting capabilities with a wider operating temperature range.

3. 74LCX245MTCX: Manufactured by Fairchild Semiconductor, this bidirectional transceiver offers low-voltage operation and reduced power consumption compared to