Encyclopedia Entry: 74VHC245PW,118

Product Overview

• Category: Integrated Circuit (IC)
• Use: Signal Level Shifter
• Characteristics: High-Speed, Low-Power, Non-Inverting, Octal Bus Transceiver
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: This IC is designed to shift the logic levels of signals between different voltage domains in electronic circuits.
• Packaging/Quantity: The 74VHC245PW,118 is typically sold in reels containing 2,500 units.

Specifications

• Supply Voltage Range: 2.0V to 5.5V
• Logic Family: VHC (Very High-Speed CMOS)
• Number of Channels: 8
• Input/Output Compatibility: TTL, LVTTL, and CMOS
• Propagation Delay: 4.3 ns (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The 74VHC245PW,118 has a total of 20 pins, which are assigned as follows:

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

Functional Features

• Non-Inverting Bidirectional Data Transfer: The IC allows bidirectional data transfer between two voltage domains without inverting the logic levels.
• High-Speed Operation: It is designed to operate at high speeds, making it suitable for applications requiring fast data transmission.
• Low Power Consumption: The IC consumes low power, making it energy-efficient and suitable for battery-powered devices.
• Wide Supply Voltage Range: It can operate within a wide range of supply voltages, providing flexibility in various electronic systems.

Advantages and Disadvantages

Advantages: - Non-inverting bidirectional data transfer simplifies circuit design. - High-speed operation enables efficient data transmission. - Low power consumption prolongs battery life. - Wide supply voltage range enhances versatility.

Disadvantages: - Limited number of channels (8) may not be sufficient for complex systems requiring more connections. - Propagation delay of 4.3 ns may introduce timing issues in certain applications.

Working Principles

The 74VHC245PW,118 operates based on CMOS technology. It utilizes a combination of MOSFET transistors to shift the logic levels of signals between different voltage domains. The direction of data transfer is controlled by the DIR pin. When the DIR pin is HIGH, data flows from the A-side to the B-side, and when it is LOW, data flows in the opposite direction.

Detailed Application Field Plans

The 74VHC245PW,118 is commonly used in various electronic systems where logic level shifting is required. Some of its typical applications include: - Interfacing between microcontrollers operating at different voltage levels. - Level translation between different logic families (TTL, LVTTL, and CMOS). - Signal buffering and isolation in communication interfaces. - Data transmission between memory modules and processors.

Detailed and Complete Alternative Models

• SN74LVC245A: Octal Bus Transceiver with 3-State Outputs
• CD74HCT245: High-Speed CMOS Logic Octal Bus Transceiver
• MC74VHC245: Octal Bus Transceiver with 3-State Outputs

These alternative models offer similar functionality to the 74VHC245PW,118 and can be considered as replacements based on specific requirements.

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