Overview
The SN74LS245NS is an 8-bit bus transceiver produced by Texas Instruments, designed for asynchronous bidirectional communication between data buses. It belongs to the 74LS series and is widely used in digital systems for data transfer and isolation. The device features 3-state outputs, allowing it to effectively isolate buses when disabled. Its target user groups include engineers and designers working on industrial automation, consumer electronics, and automotive systems. The SN74LS245NS stands out for its high-speed operation, low power consumption, and robust noise immunity, making it a competitive choice in the logic transceiver market.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Logic Type | Bipolar | - | Non-Inverting |
| Channels per Chip | 8 | - | - |
| Input Level | TTL | - | - |
| Output Level | TTL | - | - |
| Output Type | 3-State | - | - |
| High-Level Output Current | -15 | mA | - |
| Low-Level Output Current | 24 | mA | - |
| Propagation Delay Time | 12 | ns | - |
| Supply Voltage (Max) | 5.25 | V | - |
| Supply Voltage (Min) | 4.75 | V | - |
| Operating Temperature (Max) | +70 | °C | - |
| Operating Temperature (Min) | 0 | °C | - |
| Package | SO-20 | - | Reel packaging |
Key Features
- 8-bit bidirectional data transfer capability.
- 3-state outputs for bus isolation.
- High-speed operation with a typical propagation delay of 12 ns.
- Low power consumption, ideal for battery-powered applications.
- Robust noise immunity due to hysteresis on bus inputs.
- Compatible with TTL input and output levels.
Applications
The SN74LS245NS is extensively used in various fields, including industrial automation, consumer electronics, and automotive systems. In industrial automation, it facilitates data transfer between control units and sensors. In consumer electronics, it is employed in digital communication systems for signal isolation and transfer. In automotive systems, it ensures reliable data communication between electronic control units (ECUs). Its ability to handle high-speed data transfer and provide noise immunity makes it a versatile component in modern digital systems.
Q & A
1. What is the primary function of the SN74LS245NS?
The SN74LS245NS is an 8-bit bus transceiver designed for asynchronous bidirectional communication between data buses.
2. What are the key features of the SN74LS245NS?
Key features include 8-bit bidirectional data transfer, 3-state outputs, high-speed operation, low power consumption, and robust noise immunity.
3. What is the operating voltage range of the SN74LS245NS?
The operating voltage range is 4.75V to 5.25V.
4. What is the typical propagation delay of the SN74LS245NS?
The typical propagation delay is 12 ns.
5. What is the output current capability of the SN74LS245NS?
The high-level output current is -15 mA, and the low-level output current is 24 mA.
6. What is the package type of the SN74LS245NS?
The SN74LS245NS is available in an SO-20 package.
7. What are the typical applications of the SN74LS245NS?
Typical applications include industrial automation, consumer electronics, and automotive systems.
8. Is the SN74LS245NS RoHS compliant?
Yes, the SN74LS245NS is RoHS compliant.
9. What is the operating temperature range of the SN74LS245NS?
The operating temperature range is 0°C to +70°C.
10. How does the SN74LS245NS ensure noise immunity?
The SN74LS245NS ensures noise immunity through hysteresis on bus inputs, which improves noise margin and signal integrity.
