SN74AHCT245RGYR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Level Shifter and Bus Transceiver
• Characteristics: High-Speed, Low-Power, Bidirectional Voltage Translation
• Package: 20-pin VQFN (Very Thin Quad Flat No-Lead) package
• Essence: A level shifter and bus transceiver IC that allows bidirectional voltage translation between different logic levels.
• Packaging/Quantity: Available in reels of 2500 units.

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Logic Voltage Levels: 3.3V and 5V
• Input/Output Compatibility: TTL, CMOS
• Maximum Data Rate: 100 MHz
• Number of Channels: 8
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The SN74AHCT245RGYR has a total of 20 pins, which are assigned as follows:

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

Functional Features

• Bidirectional voltage translation between two different logic levels.
• Automatic direction control based on the DIR pin.
• Output enable/disable control using the OE pin.
• High-speed operation with a maximum data rate of 100 MHz.
• Low-power consumption.
• TTL and CMOS input/output compatibility.

Advantages and Disadvantages

Advantages: - Allows seamless communication between devices operating at different logic levels. - Supports bidirectional data transfer. - High-speed operation enables efficient data transmission. - Low-power consumption helps in reducing overall system power requirements.

Disadvantages: - Limited to specific logic voltage levels (3.3V and 5V). - May not be suitable for applications requiring voltage translation between other logic levels.

Working Principles

The SN74AHCT245RGYR operates by receiving data from one bus (Bus A) and translating it to the appropriate voltage level before transmitting it to another bus (Bus B). The direction of data flow is controlled by the DIR pin. When DIR is set to high, data flows from Bus A to Bus B, and when DIR is low, data flows from Bus B to Bus A.

The OE pin is used to enable or disable the outputs. When OE is high, the outputs are enabled, allowing data transmission. Conversely, when OE is low, the outputs are disabled, preventing any data transfer.

Detailed Application Field Plans

The SN74AHCT245RGYR is commonly used in various applications that require voltage translation between different logic levels. Some of the typical application fields include:

1. Microcontroller Interfacing: It facilitates communication between microcontrollers operating at different logic levels, enabling seamless integration of various components in a system.

2. Level Shifting: It is used to shift the voltage levels between different sections of a circuit, ensuring compatibility and proper signal transmission.

3. Bus Transceiver: It acts as a bidirectional buffer between buses with different logic voltage levels, allowing data exchange between them.

4. Industrial Automation: It finds applications in industrial automation systems where different devices and sensors operate at varying logic voltage levels.

Detailed and Complete Alternative Models

1. SN74LVC245A: Similar functionality but operates at lower voltages (1.65V to 3.6V).
2. SN74LVCHT245A: Supports higher data rates (up to 400 MHz) compared to SN74AHCT245RGYR.
3. SN74AVC4T245: Compact 4-bit level shifter and bus transceiver with integrated voltage translation capabilities.

These alternative models offer similar functionality to the SN74AHCT245RGYR but may have different specifications and pin configurations.

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