MM74HC245ASJ

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
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 2V to 6V
• High-Level Input Voltage: 2V to VCC
• Low-Level Input Voltage: GND to 0.8V
• High-Level Output Voltage: VCC - 0.5V
• Low-Level Output Voltage: 0.5V
• Maximum Input Current: ±1µA
• Maximum Output Current: ±25mA
• Propagation Delay Time: 10ns
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MM74HC245ASJ has a total of 20 pins. The pin configuration is as follows:

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

Functional Features

• Non-inverting bidirectional data transfer between two bus systems
• High-speed operation suitable for various applications
• Output enable and direction control for flexible data flow management
• Wide supply voltage range allows compatibility with different systems
• Low power consumption

Advantages and Disadvantages

Advantages: - High-speed operation enables efficient data transfer - Non-inverting nature preserves signal integrity - Flexible data flow management through output enable and direction control - Wide supply voltage range enhances compatibility

Disadvantages: - Limited maximum output current may restrict certain applications - Propagation delay time may affect real-time data transfer in critical systems

Working Principles

The MM74HC245ASJ is an octal bus transceiver that facilitates the bidirectional transfer of data between two bus systems. It operates by using a combination of input/output buffers and control logic. The direction of data flow is controlled by the DIR pin, while the OE pins enable or disable the outputs.

When the DIR pin is set to a specific logic level, the corresponding data inputs are connected to the A-side or B-side bus, allowing data to be transferred in the desired direction. The non-inverting nature of the transceiver ensures that the data remains unchanged during the transfer process.

Detailed Application Field Plans

The MM74HC245ASJ is commonly used in various applications where data needs to be transferred between two bidirectional bus systems. Some specific application fields include:

1. Microcontroller Interfacing: The transceiver can be used to interface microcontrollers with other devices or systems, enabling efficient data exchange.

2. Communication Systems: It can be employed in communication systems to facilitate data transfer between different modules or subsystems.

3. Industrial Automation: The transceiver finds applications in industrial automation systems where data needs to be exchanged between various control units.

4. Data Acquisition: It can be utilized in data acquisition systems to transfer data between sensors, analog-to-digital converters, and microcontrollers.

Detailed and Complete Alternative Models

1. SN74HC245N: This is a similar octal bus transceiver from Texas Instruments with comparable specifications and pin configuration.

2. CD74HC245E: Another alternative from Texas Instruments, offering similar functionality and performance.

3. 74HCT245: This is a high-speed CMOS octal bus transceiver from NXP Semiconductors, providing similar features and compatibility.

4. MC74HC245AN: An alternative option from ON Semiconductor, offering non-inverting bidirectional data transfer capabilities.

These alternative models provide similar functionality and can be considered as substitutes for the MM74HC245ASJ based on specific requirements and availability.

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