SN74AHC245NSR

Product Overview

• Category: Integrated Circuit
• Use: Level Shifter and Bus Transceiver
• Characteristics: High-Speed, Non-Inverting, 8-Bit, Bidirectional
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The SN74AHC245NSR is a versatile level shifter and bus transceiver that allows bidirectional voltage translation between different logic levels. It is commonly used in digital systems where interfacing between devices operating at different voltage levels is required.
• Packaging/Quantity: The SN74AHC245NSR is available in a standard SOIC package and is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 2 V to 5.5 V
• Logic Voltage Levels: Compatible with both 3.3 V and 5 V systems
• Input/Output Compatibility: TTL, CMOS
• Number of Channels: 8
• Propagation Delay: 6 ns (Max)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The SN74AHC245NSR has a total of 20 pins, which are assigned as follows:

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

Functional Features

• Bidirectional voltage translation between different logic levels
• Non-inverting operation preserves the logical state of the input signals
• High-speed operation allows for efficient data transfer
• Output enable control for disabling the outputs when not in use
• Direction control for selecting the direction of data flow

Advantages and Disadvantages

Advantages: - Versatile level shifting capabilities - Compatible with both 3.3 V and 5 V systems - High-speed operation - Easy to use and integrate into digital systems

Disadvantages: - Limited number of channels (8) - Propagation delay may affect timing-sensitive applications

Working Principles

The SN74AHC245NSR operates by using a combination of MOSFETs and CMOS technology to achieve bidirectional voltage translation. The direction control input (DIR) determines the direction of data flow, while the output enable input (OE) controls the enabling/disabling of the outputs. When the DIR input is set to high, the A-side becomes the input and the B-side becomes the output, allowing data to flow from A to B. Conversely, when the DIR input is set to low, the B-side becomes the input and the A-side becomes the output, enabling data flow from B to A.

Detailed Application Field Plans

The SN74AHC245NSR finds applications in various digital systems where voltage level translation is required. Some common application areas include:

1. Microcontroller interfacing: It enables communication between microcontrollers operating at different voltage levels.
2. Sensor interfaces: It facilitates the connection of sensors with different logic voltage requirements to a central processing unit.
3. Communication systems: It allows for level shifting between different communication protocols, such as UART, SPI, and I2C.
4. Industrial automation: It enables interfacing between different control modules operating at different voltage levels.

Detailed and Complete Alternative Models

1. SN74LVC245A: Low-Voltage CMOS Octal Bus Transceiver
2. SN74LVCH245A: Low-Voltage CMOS Octal Bus Transceiver with 3-State Outputs
3. SN74HCT245: High-Speed CMOS Octal Bus Transceiver

These alternative models offer similar functionality to the SN74AHC245NSR but may have different characteristics, specifications, or package options.

In conclusion, the SN74AHC245NSR is a versatile integrated circuit that provides bidirectional voltage translation between different logic levels. Its high-speed operation, compatibility with multiple voltage systems, and ease of use make it a popular choice in various digital systems. However, designers should consider its limited number of channels and propagation