SN74HCT645PWRE4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Level Shifter and Bus Transceiver
• Characteristics: High-speed, CMOS technology, 3-state outputs
• Package: TSSOP-20
• Essence: Bi-directional voltage level translator
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 25 MHz
• Number of Channels: 8
• Logic Family: HCT

Detailed Pin Configuration

The SN74HCT645PWRE4 has a total of 20 pins. The pin configuration is as follows:

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

Functional Features

• Bi-directional voltage level translation between two independent buses
• 3-state outputs allow multiple devices to share the same bus
• High-speed operation suitable for various applications
• CMOS technology provides low power consumption

Advantages and Disadvantages

Advantages: - Enables communication between systems operating at different voltage levels - Supports bidirectional data transfer - Allows multiple devices to be connected to a single bus - Low power consumption

Disadvantages: - Limited maximum operating frequency (25 MHz) - Requires careful consideration of input and output voltage levels

Working Principles

The SN74HCT645PWRE4 is designed to translate voltage levels between two independent buses. It features bidirectional data transfer, allowing information to flow in both directions. The direction of data flow is controlled by the DIR pin. When DIR is set to logic high, data is transferred from channel A to channel B. Conversely, when DIR is set to logic low, data is transferred from channel B to channel A.

The OE (Output Enable) pin enables or disables the outputs of the device. When OE is set to logic high, the outputs are in a high-impedance state, allowing other devices to drive the bus. When OE is set to logic low, the outputs are active and can drive the bus.

Detailed Application Field Plans

The SN74HCT645PWRE4 is commonly used in various applications that require voltage level translation and bidirectional data transfer. Some specific application fields include:

1. Communication Systems: Facilitates data exchange between systems operating at different voltage levels, such as microcontrollers, sensors, and display modules.
2. Industrial Automation: Enables communication between devices with varying voltage requirements, such as PLCs, motor controllers, and sensors.
3. Automotive Electronics: Used in automotive systems to interface between different voltage domains, such as CAN bus communication and sensor integration.
4. Consumer Electronics: Allows for level shifting between components in devices like smartphones, tablets, and gaming consoles.

Detailed and Complete Alternative Models

1. TXB0108PWR: 8-bit Bidirectional Voltage-Level Translator with Automatic Direction Sensing
2. PCA9306DCTR: Dual Bi-Directional I2C-Bus and SMBus Voltage-Level Translator
3. SN74LVC4245APW: Octal Bus Transceiver with 3-State Outputs

These alternative models offer similar functionality and can be used as substitutes for the SN74HCT645PWRE4 in various applications.

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