MM74HC245AN

Product Overview

• Category: Integrated Circuit
• Use: Level Shifter/Transceiver
• Characteristics: High-Speed, Non-Inverting, 3-State Outputs
• Package: DIP (Dual In-Line Package)
• Essence: The MM74HC245AN is a high-speed CMOS octal bus transceiver with 3-state outputs. It is designed to interface between TTL and CMOS levels, making it ideal for use in various digital systems.
• Packaging/Quantity: The MM74HC245AN is typically sold in tubes or reels, containing a specific quantity of units.

Specifications

• Supply Voltage: 2V - 6V
• Input Voltage: 0V - Vcc
• Output Voltage: 0V - Vcc
• Operating Temperature: -40°C to +85°C
• Propagation Delay: 10ns (max)
• Output Current: ±25mA
• Number of Pins: 20

Pin Configuration

The MM74HC245AN has a total of 20 pins, which are assigned specific functions as follows:

1. A1: Data Input/Output 1
2. B1: Data Input/Output 2
3. A2: Data Input/Output 3
4. B2: Data Input/Output 4
5. A3: Data Input/Output 5
6. B3: Data Input/Output 6
7. A4: Data Input/Output 7
8. B4: Data Input/Output 8
9. GND: Ground
10. OE: Output Enable
11. DIR: Direction Control
12. NC: No Connection
13. NC: No Connection
14. Vcc: Supply Voltage
15. B5: Data Input/Output 9
16. A5: Data Input/Output 10
17. B6: Data Input/Output 11
18. A6: Data Input/Output 12
19. B7: Data Input/Output 13
20. A7: Data Input/Output 14

Functional Features

• Bidirectional Data Transfer: The MM74HC245AN allows for bidirectional data transfer between two buses.
• Level Shifting: It can convert TTL logic levels to CMOS logic levels and vice versa, enabling compatibility between different digital systems.
• 3-State Outputs: The outputs of the MM74HC245AN can be put into a high-impedance state, allowing multiple devices to share the same bus without interference.

Advantages and Disadvantages

Advantages: - High-Speed Operation: The MM74HC245AN operates at a fast speed, making it suitable for time-critical applications. - Wide Supply Voltage Range: It can operate within a wide range of supply voltages, providing flexibility in various system designs. - Easy Interface: The pin configuration and functionality make it easy to interface with other components.

Disadvantages: - Limited Output Current: The output current is limited to ±25mA, which may not be sufficient for certain high-current applications. - Temperature Sensitivity: The MM74HC245AN's performance may be affected by extreme temperature conditions.

Working Principles

The MM74HC245AN works as a bidirectional level shifter/transceiver by utilizing a combination of CMOS technology and internal circuitry. When the direction control (DIR) input is set to a specific logic level, the data from one bus is transferred to the other bus. The output enable (OE) input controls the tri-state outputs, allowing them to be either active or in a high-impedance state.

Detailed Application Field Plans

The MM74HC245AN is commonly used in various digital systems, including but not limited to: - Microcontrollers and microprocessors - Data communication systems - Industrial automation - Automotive electronics - Consumer electronics

Alternative Models

Here are some alternative models that can be considered as replacements for the MM74HC245AN: - SN74HC245N by Texas Instruments - CD74HC245E by Texas Instruments - 74HCT245 by NXP Semiconductors - MC74HC245AN by ON Semiconductor

These alternatives offer similar functionality and characteristics, providing options for different sourcing preferences or availability.

In conclusion, the MM74HC245AN is a versatile integrated circuit that serves as a level shifter/transceiver. Its high-speed operation, bidirectional data transfer capability, and 3-state outputs make it suitable for various digital systems. While it has limitations in terms of output current and temperature sensitivity, it remains a popular choice in applications ranging from microcontrollers to automotive electronics.