SN74AS638AN

Product Overview

• Category: Integrated Circuit (IC)
• Use: Logic Level Converter
• Characteristics: High-speed, Non-inverting, Tri-state Outputs
• Package: DIP (Dual In-line Package)
• Essence: Logic level conversion between different voltage levels
• Packaging/Quantity: Tube packaging, 25 pieces per tube

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range (Low Level): -0.5V to 0.8V
• Input Voltage Range (High Level): 2V to VCC + 0.5V
• Output Voltage Range (Low Level): 0V to 0.4V
• Output Voltage Range (High Level): VCC - 0.4V to VCC
• Maximum Operating Frequency: 100 MHz
• Propagation Delay Time: 6 ns
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The SN74AS638AN has a total of 20 pins. The pin configuration is as follows:

1. OE (Output Enable) A
2. I/O A0
3. I/O A1
4. I/O A2
5. GND (Ground)
6. I/O B0
7. I/O B1
8. I/O B2
9. VCC (Supply Voltage)
10. OE (Output Enable) B
11. I/O C0
12. I/O C1
13. I/O C2
14. GND (Ground)
15. I/O D0
16. I/O D1
17. I/O D2
18. VCC (Supply Voltage)
19. OE (Output Enable) C
20. OE (Output Enable) D

Functional Features

• Non-inverting logic level conversion between different voltage levels
• High-speed operation with a maximum frequency of 100 MHz
• Tri-state outputs allow for easy interfacing with multiple devices
• Wide operating temperature range (-40°C to 85°C)
• Compatible with TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) logic families

Advantages and Disadvantages

Advantages: - Fast and efficient logic level conversion - Tri-state outputs provide flexibility in device interfacing - Wide operating temperature range allows for use in various environments - Compatibility with TTL and CMOS logic families ensures versatility

Disadvantages: - Limited number of input/output channels (3 channels per side) - Requires external pull-up resistors for proper operation

Working Principles

The SN74AS638AN is designed to convert logic levels between different voltage domains. It uses non-inverting buffers to achieve this conversion. The OE (Output Enable) pins control the tri-state outputs, allowing the device to be easily connected to multiple devices without causing conflicts.

When the OE pin is low, the corresponding output is enabled and reflects the input signal. When the OE pin is high, the output is in a high-impedance state, effectively disconnecting it from the circuit.

The device operates within a specified supply voltage range and provides reliable logic level conversion with minimal propagation delay.

Detailed Application Field Plans

The SN74AS638AN can be used in various applications that require logic level conversion between different voltage domains. Some potential application fields include:

1. Microcontroller interfacing: The IC can be used to interface microcontrollers operating at different voltage levels, enabling communication between them.
2. Sensor integration: It can be utilized to connect sensors with different logic voltage requirements to a central processing unit.
3. Communication systems: The IC can facilitate level shifting in communication systems, allowing devices with different voltage levels to communicate effectively.
4. Industrial automation: It can be employed in industrial automation systems to interface various control modules operating at different voltage levels.

Detailed and Complete Alternative Models

1. SN74LVC1T45DBVR: Single-bit dual-supply bus transceiver with configurable voltage translation
2. TXB0108PWR: 8-bit bidirectional voltage-level translator with automatic direction sensing
3. PCA9306DCUR: Dual bidirectional I2C-bus and SMBus voltage-level translator
4. CD4504BE: Hex voltage-level shifter for TTL-to-CMOS or CMOS-to-CMOS applications

These alternative models offer similar functionality and can be considered as alternatives to the SN74AS638AN based on specific application requirements.

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