SN74HCT646DWR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Bus Transceiver
• Characteristics:
  • High-Speed CMOS Logic
  • 3-State Outputs
  • Non-Inverting
  • Voltage-Level Translation
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Bidirectional Transceiver
• 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
• Propagation Delay Time: 9 ns (Max)
• Output Current: ±6 mA
• Input Capacitance: 3 pF
• Output Capacitance: 6 pF

Detailed Pin Configuration

The SN74HCT646DWR has a total of 24 pins. The pin configuration is as follows:

1. OE (Output Enable) A
2. I/O A7
3. I/O A6
4. I/O A5
5. I/O A4
6. GND (Ground)
7. I/O A3
8. I/O A2
9. I/O A1
10. I/O A0
11. VCC (Supply Voltage)
12. DIR (Direction Control)
13. I/O B0
14. I/O B1
15. I/O B2
16. I/O B3
17. GND (Ground)
18. I/O B4
19. I/O B5
20. I/O B6
21. I/O B7
22. OE (Output Enable) B
23. LE (Latch Enable)
24. GND (Ground)

Functional Features

• Bidirectional data transfer between two buses
• Non-inverting logic
• Voltage-level translation between different voltage domains
• 3-state outputs for bus isolation

Advantages and Disadvantages

Advantages: - High-speed operation - Wide supply voltage range - Easy integration into existing systems - Non-inverting logic simplifies signal processing

Disadvantages: - Limited output current capacity - Relatively high input/output capacitance

Working Principles

The SN74HCT646DWR is a bidirectional bus transceiver that allows data transfer between two buses with different voltage levels. It uses non-inverting logic, which means the input and output signals have the same logic polarity. The direction of data flow is controlled by the DIR pin. When DIR is low, data flows from A to B, and when DIR is high, data flows from B to A.

The transceiver also features 3-state outputs, which allow the bus to be isolated when necessary. The OE pins control the output enable function. When OE is high, the outputs are in the high-impedance state, effectively disconnecting the bus from the transceiver.

Detailed Application Field Plans

The SN74HCT646DWR is commonly used in various applications where bidirectional data transfer between buses with different voltage levels is required. Some specific application fields include:

1. Communication Systems: Used for level translation between different communication protocols.
2. Industrial Automation: Enables data exchange between control systems operating at different voltage levels.
3. Automotive Electronics: Facilitates communication between different subsystems within a vehicle.
4. Computer Peripherals: Allows interfacing between different logic families or voltage domains.

Detailed and Complete Alternative Models

1. SN74HCT245N: Octal Bus Transceiver with 3-State Outputs
2. SN74HCT541N: Octal Buffer/Line Driver with 3-State Outputs
3. SN74HCT573N: Octal D-Type Transparent Latch with 3-State Outputs
4. SN74HCT138N: 3-to-8 Line Decoder/Demultiplexer

These alternative models provide similar functionality and can be used as substitutes for the SN74HCT646DWR in various applications.

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