Overview
The SN74LS245N, manufactured by Texas Instruments, is an 8-bit bidirectional bus transceiver designed for asynchronous communication between data buses. It belongs to the 74LS series of logic devices and is widely used in applications requiring data transfer between different bus systems. The device features three-state outputs, enabling it to drive bus lines directly while minimizing external timing requirements. Its PNP inputs reduce DC loading on the bus, and hysteresis on bus inputs enhances noise margin. The SN74LS245N is particularly suited for applications in industrial automation, consumer electronics, and embedded systems, where reliable and efficient data transfer is essential.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Output Current | 15mA, 24mA | mA | High and Low levels |
| Supply Voltage | 4.75V ~ 5.25V | V | |
| Operating Temperature | 0℃ ~ +70℃ | ℃ | |
| Number of Pins | 20 | Pin | |
| Package | PDIP-20 | 25.40 x 6.35mm | |
| Logic Type | Transceiver, Non-Inverting | ||
| Output Type | Tri-State | ||
| Propagation Delay | 8 ns | ns | Typical |
Key Features
- Three-state outputs for direct bus driving.
- PNP inputs reduce DC loading on the bus.
- Hysteresis on bus inputs improves noise margin.
- Bidirectional data transfer with direction control.
- Output enable (OE) input for bus isolation.
Applications
The SN74LS245N is commonly used in industrial automation, consumer electronics, and embedded systems. It is ideal for applications requiring bidirectional data transfer between different bus systems, such as data acquisition systems, communication interfaces, and microcontroller-based projects. Its ability to drive bus lines directly and its noise-resistant design make it a reliable choice for high-performance systems.
Q & A
1. What is the primary function of the SN74LS245N?
The SN74LS245N is an 8-bit bidirectional bus transceiver designed for asynchronous data transfer between different bus systems.
2. What is the operating voltage range of the SN74LS245N?
The operating voltage range is 4.75V to 5.25V.
3. What is the typical propagation delay of the SN74LS245N?
The typical propagation delay is 8 ns.
4. How does the direction control (DIR) input work?
The DIR input determines the direction of data transfer: from A to B when DIR is high, and from B to A when DIR is low.
5. What is the purpose of the output enable (OE) input?
The OE input disables the device when high, effectively isolating the bus.
6. What is the output current capability of the SN74LS245N?
The output current is 15mA for high levels and 24mA for low levels.
7. What is the package type of the SN74LS245N?
The SN74LS245N is available in a 20-pin PDIP package.
8. What is the operating temperature range of the SN74LS245N?
The operating temperature range is 0℃ to +70℃.
9. Can the SN74LS245N be used in industrial applications?
Yes, it is suitable for industrial automation, data acquisition systems, and other high-performance applications.
10. What are the key advantages of the SN74LS245N?
Its key advantages include three-state outputs, reduced DC loading, improved noise margin, and bidirectional data transfer capability.
