SN74HCT645NSRG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Level shifting and bus transceiver
• Characteristics: High-speed, low-power, bidirectional voltage-level translator
• Package: 20-pin small-outline integrated circuit (SOIC)
• Essence: Translates signals between different voltage levels in digital systems
• 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: 74 MHz
• Number of Channels: 8
• Input/Output Type: Tri-state
• Logic Family: HCT

Detailed Pin Configuration

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

Functional Features

• Bidirectional voltage-level translation between two independent buses
• Supports mixed-mode signal operation on each channel
• Provides non-inverting level shifting with 3-state outputs
• Allows voltage translation from 5V to 3.3V and vice versa
• Enables interfacing between different logic families

Advantages and Disadvantages

Advantages: - High-speed operation - Low power consumption - Wide supply voltage range - Easy integration into digital systems - Multiple channels for simultaneous data transfer

Disadvantages: - Limited maximum operating frequency - Requires careful consideration of input/output voltage levels - May not support all voltage translation requirements

Working Principles

The SN74HCT645NSRG4 is a bidirectional voltage-level translator that allows seamless communication between two buses operating at different voltage levels. It uses a combination of level-shifting circuitry and tri-state buffers to ensure reliable data transfer.

When the direction control input (DIR) is set to logic high, the A bus is connected to the B bus, allowing data transmission from A to B. Conversely, when DIR is set to logic low, the B bus is connected to the A bus, enabling data transmission from B to A.

The output enable input (OE) controls the tri-state buffers, allowing the outputs to be disabled when not in use. This feature prevents bus contention and reduces power consumption.

Detailed Application Field Plans

The SN74HCT645NSRG4 is commonly used in various applications where voltage-level translation is required. Some typical application fields include:

1. Microcontroller interfacing: It enables communication between microcontrollers operating at different voltage levels, facilitating system integration.
2. Mixed-voltage systems: It allows seamless data transfer between subsystems or modules operating at different voltage levels, ensuring compatibility.
3. Communication interfaces: It enables voltage translation between different communication protocols, such as UART, SPI, and I2C, allowing interoperability.
4. Industrial automation: It facilitates data exchange between control systems and peripheral devices operating at different voltage levels, enhancing system connectivity.

Detailed and Complete Alternative Models

1. TXB0108PWR: 8-bit bidirectional voltage-level translator with automatic direction sensing.
2. PCA9306DCTR: Dual bidirectional I2C-bus and SMBus voltage-level translator.
3. SN74LVC4245APW: Octal bus transceiver and voltage-level shifter with 3-state outputs.
4. CD4504BE: Hex non-inverting level shifter for TTL-to-CMOS or CMOS-to-CMOS applications.

These alternative models offer similar functionality and can be considered based on specific application requirements.

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