SN74ALVCH245DW

Product Overview

• Category: Integrated Circuit (IC)
• Use: Level Shifter and Bus Transceiver
• Characteristics: Bi-directional voltage level translation between different logic levels, high-speed operation, low power consumption
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The SN74ALVCH245DW is a 8-bit bus transceiver that provides voltage level translation between a 3.3V and 5V bus. It allows bidirectional communication between devices operating at different voltage levels.
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage Range: 1.65V to 3.6V
• High-Level Input Voltage: 2.3V to VCC + 0.3V
• Low-Level Input Voltage: -0.3V to 0.8V
• High-Level Output Voltage: 2.4V (minimum) at IOH = -12mA
• Low-Level Output Voltage: 0.4V (maximum) at IOL = 24mA
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The SN74ALVCH245DW has a total of 20 pins, which are assigned as follows:

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

Functional Features

• Bidirectional voltage level translation between 3.3V and 5V buses
• Supports both push-pull and open-drain outputs
• High-speed operation with minimal propagation delay
• Low power consumption, making it suitable for battery-powered devices
• ESD protection on all pins to prevent damage from electrostatic discharge

Advantages and Disadvantages

Advantages: - Enables communication between devices operating at different voltage levels - Provides flexibility in designing systems with mixed voltage components - Fast switching speed allows for efficient data transfer - Low power consumption helps extend battery life in portable devices

Disadvantages: - May require additional external components for proper voltage translation in certain applications - Limited to translating between 3.3V and 5V logic levels, not suitable for other voltage ranges

Working Principles

The SN74ALVCH245DW operates by using a combination of MOSFETs and control circuitry to perform the voltage level translation. When the DIR pin is set to a specific logic level, the device determines the direction of data flow between the A and B ports. The OE pin controls the output enable function, allowing the device to be enabled or disabled as needed.

Detailed Application Field Plans

The SN74ALVCH245DW is commonly used in various applications, including:

1. Interfacing between microcontrollers and peripheral devices operating at different voltage levels
2. Level shifting in communication interfaces such as UART, SPI, and I2C
3. Bus transceiver for data transfer between different logic families
4. Voltage level translation in mixed-voltage systems, such as industrial automation and automotive electronics

Detailed and Complete Alternative Models

• SN74LVC245A: 8-bit bus transceiver with similar functionality but operates at a lower voltage range (1.65V to 3.6V)
• SN74HCT245: 8-bit bus transceiver compatible with TTL logic levels (5V)
• SN74LVCC3245A: 8-bit dual-supply bus transceiver with voltage level translation capability

These alternative models offer similar functionality to the SN74ALVCH245DW but may have different voltage ranges or additional features depending on the specific application requirements.

In conclusion, the SN74ALVCH245DW is a versatile integrated circuit that enables bidirectional voltage level