ON Semiconductor
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MM74HCT245N
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MM74HCT245N

Product Overview

  • Category: Integrated Circuit
  • Use: Level Shifter/Transceiver
  • Characteristics: High-Speed, CMOS Technology
  • Package: DIP (Dual Inline Package)
  • Essence: Bidirectional Logic Level Shifter
  • Packaging/Quantity: Tube, 25 pieces per tube

Specifications

  • Supply Voltage Range: 4.5V to 5.5V
  • Input Voltage Range: 0V to VCC
  • Output Voltage Range: 0V to VCC
  • Maximum Input Current: ±20mA
  • Maximum Output Current: ±35mA
  • Propagation Delay Time: 9ns (typical)
  • Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The MM74HCT245N has a total of 20 pins, which are divided into two groups:

Group A (Input/Output Pins)

  1. DIR (Direction Control)
  2. OE (Output Enable)
  3. A1 (Data Input/Output)
  4. A2 (Data Input/Output)
  5. A3 (Data Input/Output)
  6. A4 (Data Input/Output)
  7. A5 (Data Input/Output)
  8. A6 (Data Input/Output)
  9. A7 (Data Input/Output)
  10. GND (Ground)

Group B (Input/Output Pins)

  1. B1 (Data Input/Output)
  2. B2 (Data Input/Output)
  3. B3 (Data Input/Output)
  4. B4 (Data Input/Output)
  5. B5 (Data Input/Output)
  6. B6 (Data Input/Output)
  7. B7 (Data Input/Output)
  8. VCC (Supply Voltage)
  9. NC (No Connection)
  10. GND (Ground)

Functional Features

  • Bidirectional data transfer between two different voltage levels
  • High-speed operation suitable for various applications
  • CMOS technology ensures low power consumption
  • Output enable and direction control for flexible data flow management

Advantages and Disadvantages

Advantages

  • Efficient level shifting capability
  • Wide operating voltage range
  • Low power consumption
  • Compact DIP package for easy integration

Disadvantages

  • Limited number of input/output pins (7 per group)
  • Propagation delay may affect timing-sensitive applications

Working Principles

The MM74HCT245N is a bidirectional logic level shifter/transceiver that allows seamless data transfer between two systems operating at different voltage levels. It utilizes CMOS technology, which ensures high-speed operation while consuming minimal power. The direction control pin (DIR) determines the data flow direction, while the output enable pin (OE) enables or disables the outputs. By applying appropriate voltage levels to these control pins, the MM74HCT245N can efficiently shift logic levels and facilitate communication between devices.

Detailed Application Field Plans

The MM74HCT245N finds extensive use in various applications where bidirectional level shifting is required. Some common application fields include:

  1. Microcontroller interfacing with different voltage peripherals
  2. Communication between systems operating at different voltage levels
  3. Logic level translation in mixed-voltage environments
  4. Signal buffering and voltage level conversion in industrial automation
  5. Interface conversion in automotive electronics

Detailed and Complete Alternative Models

  1. SN74HCT245N: Similar functionality, different manufacturer (Texas Instruments)
  2. CD74HCT245E: Equivalent logic level shifter, different package (PDIP)
  3. 74HCT245D: Surface mount alternative, smaller form factor (SOIC)

These alternative models offer similar features and can be used as replacements for the MM74HCT245N in various applications.

In conclusion, the MM74HCT245N is a versatile bidirectional logic level shifter/transceiver that enables seamless data transfer between systems operating at different voltage levels. Its high-speed operation, low power consumption, and compact package make it suitable for a wide range of applications in diverse fields.

Seznam 10 běžných otázek a odpovědí souvisejících s aplikací MM74HCT245N v technických řešeních

Sure! Here are 10 common questions and answers related to the application of MM74HCT245N in technical solutions:

  1. Q: What is MM74HCT245N? A: MM74HCT245N is a popular octal bus transceiver integrated circuit (IC) that can be used for bidirectional level shifting between different voltage domains.

  2. Q: What is the operating voltage range of MM74HCT245N? A: MM74HCT245N operates within a voltage range of 4.5V to 5.5V.

  3. Q: How many bidirectional channels does MM74HCT245N have? A: MM74HCT245N has 8 bidirectional channels, allowing it to handle data transfer in both directions simultaneously.

  4. Q: Can MM74HCT245N be used for voltage translation between different logic families? A: Yes, MM74HCT245N is commonly used for voltage translation between TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) logic families.

  5. Q: What is the maximum data transfer rate supported by MM74HCT245N? A: MM74HCT245N supports a maximum data transfer rate of 25 MHz.

  6. Q: Does MM74HCT245N have any built-in protection features? A: Yes, MM74HCT245N has built-in diode clamps on its inputs and outputs, providing protection against electrostatic discharge (ESD).

  7. Q: Can MM74HCT245N be used as a level shifter for I2C communication? A: Yes, MM74HCT245N can be used as a level shifter for I2C communication between devices operating at different voltage levels.

  8. Q: What is the power supply current requirement for MM74HCT245N? A: The typical power supply current requirement for MM74HCT245N is around 10 mA.

  9. Q: Can MM74HCT245N be used in high-speed applications? A: While MM74HCT245N supports relatively high data transfer rates, it may not be suitable for very high-speed applications due to its propagation delay characteristics.

  10. Q: Are there any specific layout considerations when using MM74HCT245N? A: Yes, it is recommended to follow proper PCB layout guidelines, including minimizing trace lengths and providing adequate decoupling capacitors, to ensure optimal performance of MM74HCT245N.

Please note that these answers are general and may vary depending on specific application requirements.