Encyclopedia Entry: 74HCT646N,652

Product Overview

• Category: Integrated Circuit (IC)
• Use: Bus Transceiver
• Characteristics: High-speed, CMOS technology
• Package: DIP (Dual In-line Package)
• Essence: Bidirectional octal bus transceiver with 3-state outputs
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 4.5V to 5.5V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +125°C
• Propagation Delay Time: 10ns (max)
• Output Current: ±6mA
• Input Capacitance: 3pF
• Output Capacitance: 8pF

Detailed Pin Configuration

The 74HCT646N,652 has a total of 24 pins. The pin configuration is as follows:

1. OE (Output Enable) 1
2. A1 (Address Input) 1
3. A2 (Address Input) 2
4. A3 (Address Input) 3
5. A4 (Address Input) 4
6. A5 (Address Input) 5
7. A6 (Address Input) 6
8. A7 (Address Input) 7
9. GND (Ground)
10. B1 (Data Bus) 1
11. B2 (Data Bus) 2
12. B3 (Data Bus) 3
13. B4 (Data Bus) 4
14. B5 (Data Bus) 5
15. B6 (Data Bus) 6
16. B7 (Data Bus) 7
17. B8 (Data Bus) 8
18. VCC (Supply Voltage)
19. DIR (Direction Control)
20. OE (Output Enable) 2
21. A0 (Address Input) 0
22. B0 (Data Bus) 0
23. BDIR (Bus Direction Control)
24. GND (Ground)

Functional Features

• Bidirectional data transfer between two independent buses
• 3-state outputs for bus isolation
• Output enable and direction control for flexible operation
• High-speed operation suitable for various applications
• CMOS technology ensures low power consumption

Advantages and Disadvantages

Advantages: - Allows bidirectional data transfer between buses - Provides bus isolation with 3-state outputs - Flexible operation with output enable and direction control

Disadvantages: - Limited to a specific package type (DIP) - Requires careful handling due to sensitivity to static electricity

Working Principles

The 74HCT646N,652 is designed to facilitate bidirectional data transfer between two independent buses. It utilizes output enable and direction control signals to determine the direction of data flow. When the output enable signal is active, the device allows data to be transferred from one bus to the other. The direction control signal determines whether the data is transferred in the forward or reverse direction.

Detailed Application Field Plans

The 74HCT646N,652 is commonly used in various applications that require bidirectional data transfer between buses. Some typical application fields include: - Microprocessor systems - Data communication systems - Industrial automation - Test and measurement equipment - Networking devices

Detailed and Complete Alternative Models

• 74HCT245N,652: Octal bus transceiver with non-inverting 3-state outputs
• 74HCT640N,652: Octal bus transceiver with inverting 3-state outputs
• 74HCT541N,652: Octal buffer/line driver with 3-state outputs

These alternative models offer similar functionality but may have different pin configurations or characteristics.

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