Encyclopedia Entry: 74AC245MTCX

Product Overview

Category

The 74AC245MTCX belongs to the category of integrated circuits (ICs) and specifically falls under the group of digital logic devices.

Use

This product is commonly used for signal level shifting and voltage translation in various electronic applications. It facilitates the bidirectional transfer of data between two different voltage domains.

Characteristics

• The 74AC245MTCX is a high-speed, octal bus transceiver.
• It operates on a supply voltage range of 2V to 6V.
• This IC offers low power consumption and high noise immunity.
• It features eight bidirectional buffers with separate input and output ports.
• The device supports both TTL and CMOS voltage levels.

Package and Quantity

The 74AC245MTCX is available in a small outline surface-mount package (TSSOP-20). It is typically sold in reels or tubes containing multiple units.

Essence

The essence of the 74AC245MTCX lies in its ability to enable seamless communication between different voltage domains, ensuring reliable data transfer in electronic systems.

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage High (VIH): 2V to VCC
• Input Voltage Low (VIL): GND to 0.8V
• Output Voltage High (VOH): 2.4V (min)
• Output Voltage Low (VOL): 0.4V (max)
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 5.5ns (typical)

Detailed Pin Configuration

The 74AC245MTCX has a total of 20 pins, which are assigned specific functions as follows:

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

Functional Features

• Bidirectional data transfer between two voltage domains.
• High-speed operation for efficient signal transmission.
• Output enable control to disable the outputs when not required.
• Direction control to select the direction of data flow.

Advantages and Disadvantages

Advantages

• Wide supply voltage range allows compatibility with various systems.
• Low power consumption enhances energy efficiency.
• High noise immunity ensures reliable data transmission.
• Compact surface-mount package enables space-saving designs.

Disadvantages

• Limited number of input/output ports restricts scalability in complex applications.
• Propagation delay may affect real-time data synchronization in certain scenarios.

Working Principles

The 74AC245MTCX operates based on the principles of voltage level shifting and bidirectional data transfer. It utilizes internal circuitry to convert signals between two different voltage domains, allowing seamless communication between devices operating at different voltage levels. The direction control pin determines the flow of data, while the output enable pin enables or disables the outputs as required.

Detailed Application Field Plans

The 74AC245MTCX finds applications in various electronic systems, including but not limited to:

1. Microcontroller interfacing with peripherals operating at different voltage levels.
2. Level shifting in communication interfaces such as UART, SPI, and I2C.
3. Signal translation between logic families (e.g., TTL to CMOS).
4. Data bus buffering in multiprocessor systems.
5. Voltage level conversion in battery-powered devices.

Detailed Alternative Models

For similar functionality, alternative models to the 74AC245MTCX include:

1. 74HC245: A CMOS-based octal bus transceiver with comparable characteristics.
2. SN74LV245A: A low-voltage octal bus