Encyclopedia Entry: 74F640PC

Product Information Overview

• Category: Integrated Circuit (IC)
• Use: Logic Level Translator
• Characteristics: High-speed, octal bus transceiver with non-inverting 3-state outputs
• Package: DIP (Dual In-line Package)
• Essence: The 74F640PC is a versatile logic level translator that allows bidirectional voltage translation between different logic levels.
• Packaging/Quantity: Typically sold in packs of 10 or 25 units.

Specifications

• Supply Voltage: 4.5V to 5.5V
• Logic Family: Fast CMOS (Complementary Metal-Oxide-Semiconductor)
• Number of Channels: 8
• Input/Output Compatibility: TTL (Transistor-Transistor Logic) and CMOS
• Propagation Delay: 6 ns (max)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The 74F640PC has a total of 20 pins, which are assigned as follows:

1. A1 (Input A1)
2. B1 (Input B1)
3. GND (Ground)
4. A2 (Input A2)
5. B2 (Input B2)
6. OE (Output Enable)
7. Y1 (Output Y1)
8. Y2 (Output Y2)
9. VCC (Power Supply)
10. A3 (Input A3)
11. B3 (Input B3)
12. GND (Ground)
13. A4 (Input A4)
14. B4 (Input B4)
15. OE (Output Enable)
16. Y3 (Output Y3)
17. Y4 (Output Y4)
18. VCC (Power Supply)
19. GND (Ground)
20. Y5-Y8 (Outputs Y5 to Y8)

Functional Features

• Bidirectional voltage translation between TTL and CMOS logic levels.
• Non-inverting 3-state outputs allow multiple devices to share a common bus.
• High-speed operation with minimal propagation delay.
• Wide operating temperature range for versatile applications.

Advantages and Disadvantages

Advantages: - Versatile logic level translation capability. - High-speed operation. - Non-inverting 3-state outputs facilitate bus sharing.

Disadvantages: - Limited to 8 channels. - Requires external pull-up resistors for proper operation.

Working Principles

The 74F640PC utilizes a combination of MOSFETs and CMOS technology to achieve bidirectional voltage translation. The input signals are level-shifted to the desired output voltage level, allowing seamless communication between different logic families. The non-inverting 3-state outputs enable multiple devices to be connected to a common bus without interference.

Detailed Application Field Plans

The 74F640PC is commonly used in various applications that require voltage translation between TTL and CMOS logic levels. Some typical application fields include:

1. Microcontroller interfacing with peripheral devices.
2. Communication systems involving mixed logic families.
3. Data acquisition and control systems.
4. Industrial automation and robotics.
5. Automotive electronics.

Detailed and Complete Alternative Models

• 74HC640: Similar octal bus transceiver with 3-state outputs, compatible with CMOS logic levels.
• SN74LVCHT640: Octal bus transceiver with 3-state outputs, designed for low-voltage applications.
• CD4050: Hex non-inverting buffer/converter, suitable for level shifting between TTL and CMOS.

(Note: This list is not exhaustive and there are several other alternative models available in the market.)

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