Encyclopedia Entry: 74ACQ245PC

Product Overview

Category

The 74ACQ245PC belongs to the category of integrated circuits (ICs), specifically a type of digital logic level shifter.

Use

This IC is commonly used for voltage level shifting in digital systems. It allows for bidirectional data transfer between devices operating at different voltage levels.

Characteristics

• Bidirectional voltage level shifting
• High-speed operation
• Low power consumption
• Wide operating voltage range
• Compatibility with various logic families

Package

The 74ACQ245PC is available in a standard 20-pin plastic dual in-line package (PDIP).

Essence

The essence of the 74ACQ245PC lies in its ability to facilitate seamless communication between digital devices operating at different voltage levels, ensuring compatibility and reliable data transfer.

Packaging/Quantity

The IC is typically packaged in tubes or reels, containing multiple units per package. The exact quantity may vary depending on the supplier.

Specifications

• Supply Voltage Range: 2V to 6V
• Logic Family: Advanced CMOS (AC)
• Number of Channels: 8
• Input/Output Voltage Levels: Compatible with TTL, CMOS, and LVTTL
• Maximum Data Rate: 200 MHz
• Propagation Delay: 4 ns (typical)

Detailed Pin Configuration

The 74ACQ245PC has a total of 20 pins, each serving a specific function. The pin configuration is as follows:

1. OE (Output Enable) - Output control pin
2. A1-A8 - Input/output pins for channel A
3. GND - Ground reference
4. B1-B8 - Input/output pins for channel B
5. VCC - Positive supply voltage
6. DIR (Direction Control) - Controls the direction of data flow

Functional Features

• Bidirectional data transfer: Allows data to be transmitted in both directions between devices with different voltage levels.
• Output enable control: The OE pin enables or disables the outputs, providing flexibility in controlling data flow.
• Direction control: The DIR pin determines the direction of data transmission, allowing for versatile communication setups.

Advantages and Disadvantages

Advantages

• Efficient voltage level shifting: Enables seamless communication between devices operating at different voltage levels.
• High-speed operation: Supports fast data transfer rates up to 200 MHz.
• Low power consumption: Helps conserve energy in digital systems.
• Wide compatibility: Works well with various logic families, including TTL, CMOS, and LVTTL.

Disadvantages

• Limited channel count: The 74ACQ245PC provides 8 channels, which may not be sufficient for complex systems requiring a higher number of connections.
• Propagation delay: Although relatively low (4 ns), the propagation delay can impact real-time applications that require instantaneous data transfer.

Working Principles

The 74ACQ245PC utilizes a combination of transistors and logic gates to achieve voltage level shifting. It employs a bidirectional buffer circuit that allows data to flow in either direction based on the control signals provided by the DIR and OE pins. The internal circuitry ensures proper voltage translation while maintaining signal integrity.

Detailed Application Field Plans

The 74ACQ245PC finds application in various fields where voltage level shifting is required. Some common application areas include:

1. Microcontroller interfacing: Facilitating communication between microcontrollers operating at different voltage levels.
2. Sensor networks: Enabling data exchange between sensors and microcontrollers with varying voltage requirements.
3. Communication systems: Supporting voltage level adaptation in serial communication interfaces like UART, SPI, and I2C.
4. Industrial automation: Integrating devices with different voltage standards in control systems.

Detailed and Complete Alternative Models

1. 74HCT245: Similar to the 74ACQ245PC, but operates at a lower voltage range (4.5V to 5.5V).
2. SN74LVCH245A: Offers similar functionality with lower power consumption and wider operating voltage range (1.65V to 5.5V).
3. CD4508: Provides bidirectional level shifting with additional features like latching and enable/disable control.

These alternative models offer comparable voltage level shifting capabilities and can be considered based on specific application requirements.

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