SN74HC245DWG4

Product Overview

• Category: Integrated Circuit
• Use: Level Shifter and Bus Transceiver
• Characteristics: High-Speed, Octal-Bus Transceiver, 3-State Outputs
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The SN74HC245DWG4 is a high-performance, octal-bus transceiver designed for asynchronous communication between different voltage level systems.
• Packaging/Quantity: Available in tape and reel packaging with 2500 units per reel.

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage Levels: VCC or GND
• Output Voltage Levels: VCC or GND
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 9 ns (max) at 5V supply
• Output Drive Capability: ±24 mA at 5V supply

Detailed Pin Configuration

The SN74HC245DWG4 has a total of 20 pins. The pin configuration is as follows:

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

Functional Features

• Bidirectional Data Transfer: The SN74HC245DWG4 allows for bidirectional data transfer between two buses with different voltage levels.
• 3-State Outputs: The device features 3-state outputs, which can be disabled to effectively isolate the bus lines.
• High-Speed Operation: With a propagation delay of only 9 ns, the SN74HC245DWG4 ensures fast and efficient data transmission.

Advantages and Disadvantages

Advantages

• Efficient Level Shifting: Enables communication between systems operating at different voltage levels.
• Versatile Application: Suitable for various applications requiring bidirectional data transfer.
• Compact Package: The SOIC package offers a small footprint, making it suitable for space-constrained designs.

Disadvantages

• Limited Voltage Range: The supply voltage range is limited to 2V to 6V, which may not be suitable for all applications.
• Propagation Delay: Although relatively fast, the propagation delay of 9 ns may not be sufficient for extremely time-sensitive applications.

Working Principles

The SN74HC245DWG4 operates by receiving data from one bus and transmitting it to another bus bidirectionally. The direction of data flow is controlled by the DIR pin. When DIR is set to logic high, data flows from A1-A8 inputs to B1-B8 outputs. Conversely, when DIR is set to logic low, data flows from B1-B8 inputs to A1-A8 outputs. The OE pin enables or disables the outputs, allowing for isolation of the bus lines when necessary.

Detailed Application Field Plans

The SN74HC245DWG4 finds applications in various fields where level shifting and bidirectional data transfer are required. Some potential application areas include:

1. Microcontroller Interfacing: The device can be used to interface microcontrollers operating at different voltage levels.
2. Communication Systems: It enables communication between systems with varying voltage requirements, such as UART, SPI, or I2C interfaces.
3. Industrial Automation: The SN74HC245DWG4 can be utilized in industrial automation systems for signal level conversion and bus transceiver functions.

Detailed and Complete Alternative Models

• SN74HCT245: Similar to SN74HC245DWG4 but operates at a wider supply voltage range of 4.5V to 5.5V.
• SN74LVC245A: Low-voltage version of the SN74HC245DWG4, designed for operation at 1.65V to 3.6V supply voltage.

These alternative models offer similar functionality to the SN74HC245DWG4 but may have different voltage ranges or package options to suit specific application requirements.

In conclusion, the SN74HC245DWG4 is a high-performance octal-bus transceiver that facilitates bid