SN74AS640DWRG4

Product Overview

• Category: Integrated Circuit
• Use: Logic Level Translator
• Characteristics: High-speed, Non-inverting, Octal Bus Transceiver
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Translates signals between different voltage levels in digital systems
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• High-level Input Voltage: 2V to VCC + 0.5V
• Low-level Input Voltage: -0.5V to 0.8V
• High-level Output Voltage: VCC - 0.5V
• Low-level Output Voltage: 0.5V
• Maximum Operating Frequency: 125 MHz
• Propagation Delay Time: 6 ns
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The SN74AS640DWRG4 has a total of 20 pins. The pin configuration is as follows:

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

Functional Features

• Non-inverting bidirectional data transmission
• High-speed operation suitable for fast digital systems
• Octal bus transceiver with separate output enable control for each direction
• Translates signals between two voltage domains, allowing compatibility between different logic families

Advantages and Disadvantages

Advantages: - High-speed operation enables efficient data transfer in fast digital systems - Non-inverting functionality preserves signal integrity - Separate output enable control provides flexibility in controlling data flow

Disadvantages: - Limited to translating signals between two voltage levels - Requires careful consideration of voltage compatibility between input and output domains

Working Principles

The SN74AS640DWRG4 is a logic level translator designed to facilitate communication between digital systems operating at different voltage levels. It uses non-inverting bidirectional buffers to translate signals between two voltage domains. The device features separate output enable control for each direction, allowing selective data transmission.

When the output enable (OE) pin is low, the device is enabled, and the input signals are transmitted to the corresponding outputs without any voltage level translation. When the OE pin is high, the device is disabled, and the outputs are in a high-impedance state.

The SN74AS640DWRG4 ensures reliable data transmission by providing non-inverting functionality, preserving the integrity of the input signals during translation.

Detailed Application Field Plans

The SN74AS640DWRG4 is commonly used in various applications where voltage level translation is required. Some of the typical application fields include:

1. Microcontroller interfacing: The device allows communication between microcontrollers operating at different voltage levels, enabling seamless integration of multiple microcontrollers in a system.
2. Mixed logic systems: It facilitates data exchange between different logic families, such as TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor), ensuring compatibility and interoperability.
3. Communication interfaces: The SN74AS640DWRG4 is used in communication interfaces, such as UART (Universal Asynchronous Receiver-Transmitter) or SPI (Serial Peripheral Interface), to enable data transfer between devices operating at different voltage levels.

Detailed and Complete Alternative Models

1. SN74LVC4245A: Low-Voltage Octal Bus Transceiver with 3-State Outputs
2. SN74LVCH245A: Low-Voltage Octal Bus Transceiver with 3-State Outputs
3. SN74AVC4T774: 4-Bit Dual-Supply Bus Transceiver with Configurable Voltage Translation

These alternative models offer similar functionality and are suitable replacements for the SN74AS640DWRG4 in various applications.

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