DM74AS645N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Digital Logic Level Translator
• Characteristics: High-speed, Non-Inverting, Octal Bus Transceiver
• Package: DIP (Dual In-line Package)
• Essence: Translates logic levels between two different voltage domains
• Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier

Specifications

• Logic Family: Advanced Schottky TTL (Transistor-Transistor Logic)
• Number of Channels: 8
• Input Voltage: 2.0V to 6.0V
• Output Voltage: 2.0V to 6.0V
• Propagation Delay Time: 9ns (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The DM74AS645N has a total of 20 pins, which are divided as follows:

• Pins 1-8: A1-A8 (Channel A Inputs/Outputs)
• Pins 9-16: B1-B8 (Channel B Inputs/Outputs)
• Pin 17: GND (Ground)
• Pin 18: OE (Output Enable)
• Pin 19: VCC (Positive Power Supply)
• Pin 20: NC (No Connection)

Functional Features

• Bidirectional data transfer between Channel A and Channel B
• Non-inverting logic translation
• High-speed operation suitable for bus applications
• Output enable control for tristate operation

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient data transfer - Non-inverting logic translation preserves signal integrity - Tristate operation enables easy bus sharing

Disadvantages: - Limited voltage range (2.0V to 6.0V) - Not suitable for applications requiring level shifting beyond specified voltage range

Working Principles

The DM74AS645N is designed to translate logic levels between two different voltage domains. It operates by receiving input signals from Channel A and translating them to the corresponding logic levels in Channel B, and vice versa. The non-inverting nature of the translation ensures that the output signal retains the same logical state as the input signal.

The IC also features an output enable control (OE) pin, which allows the user to tristate the outputs. This feature is particularly useful when multiple devices are connected to a common bus, as it prevents contention and allows for efficient sharing of the bus.

Detailed Application Field Plans

The DM74AS645N can be used in various applications where logic level translation is required. Some potential application fields include:

1. Microcontroller interfacing with different voltage peripherals
2. Communication systems involving multiple voltage domains
3. Data acquisition systems with mixed voltage sensors
4. Industrial automation and control systems
5. Automotive electronics for level translation between different subsystems

Detailed and Complete Alternative Models

1. SN74LVC4245A: Octal Bus Transceiver with 3-State Outputs
2. CD4508B: CMOS Dual 4-Bit Latch/4-to-8 Line Decoder
3. MC74HC245A: Octal 3-State Noninverting Bus Transceiver

These alternative models offer similar functionality to the DM74AS645N and can be considered based on specific requirements and availability.

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