SN74HC245DBR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Level shifting and signal buffering
• Characteristics: High-speed, low-power, 8-bit bidirectional transceiver
• Package: SSOP-20
• Essence: Transfers data between different voltage levels in digital 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: ±20mA
• Maximum Output Current: ±35mA
• Propagation Delay Time: 10ns
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The SN74HC245DBR has a total of 20 pins. The pin configuration is as follows:

1. DIR (Direction Control)
2. OE (Output Enable)
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 between two voltage domains
• Automatic direction control based on DIR pin
• Output enable/disable control using OE pin
• High-speed operation with low power consumption
• Schmitt-trigger inputs for noise immunity
• ESD protection on all inputs and outputs

Advantages and Disadvantages

Advantages: - Allows interfacing between different voltage levels in digital systems - Supports bidirectional data transfer - Provides automatic direction control and output enable/disable features - Offers high-speed operation with low power consumption - Ensures noise immunity with Schmitt-trigger inputs - Provides ESD protection on all inputs and outputs

Disadvantages: - Limited to 8-bit data transfer - Requires careful consideration of voltage level compatibility

Working Principles

The SN74HC245DBR is a bidirectional transceiver that facilitates the transfer of data between two voltage domains in digital systems. The direction of data flow is controlled by the DIR pin, while the OE pin enables or disables the outputs. The device operates at high speed and consumes low power. It incorporates Schmitt-trigger inputs for improved noise immunity and provides ESD protection on all inputs and outputs.

Detailed Application Field Plans

The SN74HC245DBR can be used in various applications, including but not limited to:

1. Microcontroller interfacing with external devices operating at different voltage levels
2. Level shifting in communication interfaces such as UART, SPI, and I2C
3. Buffering signals between different logic families (e.g., TTL to CMOS)
4. Data transfer between memory modules with varying voltage requirements
5. Signal isolation in mixed-voltage systems

Alternative Models

1. SN74HCT245: Similar functionality with TTL-level inputs
2. SN74LVC245A: Low-voltage CMOS transceiver with 5V-tolerant inputs
3. SN74LVCH245A: Low-voltage CMOS transceiver with 5V-tolerant inputs and higher speed

These alternative models offer similar functionality to the SN74HC245DBR but may have different voltage level compatibility or additional features.

In conclusion, the SN74HC245DBR is a versatile integrated circuit that enables bidirectional data transfer between different voltage domains in digital systems. Its high-speed operation, low power consumption, and various control features make it suitable for a wide range of applications.