SN74HCT645DWG4

Product Overview

• Category: Integrated Circuit
• Use: Level Shifting and Bus Transceiver
• Characteristics: High-Speed, CMOS Logic, 3-State Outputs
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Transceiver IC for bidirectional level shifting between different voltage domains
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Number of Channels: 8
• Output Current: ±6mA
• Propagation Delay Time: 14ns (typical)
• Maximum Operating Frequency: 50MHz

Detailed Pin Configuration

The SN74HCT645DWG4 has a total of 20 pins, which are assigned as follows:

1. OE (Output Enable) 1
2. A1 (Data Direction Control) 1
3. I/O1 (Bidirectional Data I/O) 1
4. GND (Ground)
5. I/O2 (Bidirectional Data I/O) 2
6. A2 (Data Direction Control) 2
7. OE (Output Enable) 2
8. VCC (Supply Voltage)
9. I/O3 (Bidirectional Data I/O) 3
10. A3 (Data Direction Control) 3
11. I/O4 (Bidirectional Data I/O) 4
12. A4 (Data Direction Control) 4
13. I/O5 (Bidirectional Data I/O) 5
14. A5 (Data Direction Control) 5
15. I/O6 (Bidirectional Data I/O) 6
16. A6 (Data Direction Control) 6
17. I/O7 (Bidirectional Data I/O) 7
18. A7 (Data Direction Control) 7
19. I/O8 (Bidirectional Data I/O) 8
20. A8 (Data Direction Control) 8

Functional Features

• Bidirectional level shifting between different voltage domains
• 3-state outputs allow multiple devices to share a common bus
• High-speed operation suitable for various applications
• CMOS logic ensures low power consumption
• Schmitt-trigger inputs provide noise immunity

Advantages and Disadvantages

Advantages: - Enables communication between devices operating at different voltage levels - Supports bidirectional data transfer - Low power consumption due to CMOS technology - Noise immunity provided by Schmitt-trigger inputs

Disadvantages: - Limited to a maximum operating frequency of 50MHz - Requires careful consideration of voltage compatibility between connected devices

Working Principles

The SN74HCT645DWG4 is designed to facilitate bidirectional level shifting between different voltage domains. It allows data transmission between devices operating at different voltage levels while ensuring compatibility and signal integrity. The device utilizes CMOS technology, which provides low power consumption and high noise immunity through Schmitt-trigger inputs.

Detailed Application Field Plans

The SN74HCT645DWG4 finds application in various scenarios where bidirectional level shifting is required. Some potential application fields include:

1. Communication interfaces between microcontrollers operating at different voltage levels.
2. Interfacing between digital logic circuits with varying voltage requirements.
3. Bus transceivers in mixed-voltage systems, such as automotive electronics or industrial control systems.
4. Level shifting in battery-powered devices to enable communication between different voltage domains.

Detailed and Complete Alternative Models

1. SN74HCT245DWG4: Similar functionality with 8 channels, but without the bidirectional feature.
2. SN74LVC245ADW: 8-channel bidirectional level shifter with lower power consumption and higher operating frequency.
3. SN74LVCHT245ADBR: 8-channel bidirectional level translator with enhanced ESD protection and wider supply voltage range.

These alternative models offer similar functionality to the SN74HCT645DWG4 but may have different specifications or additional features depending on the specific requirements of the application.

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