SN74LVC245APWR Low-Voltage Octal Bus Transceiver Overview
The SN74LVC245APWR from Texas Instruments is a high-performance octal (8-channel) bus transceiver designed for bidirectional data transfer in low-voltage electronic systems. Its tri-state outputs enable safe isolation of buses, preventing signal conflicts when multiple devices share communication paths. This makes it indispensable for industrial automation, data centers, and telecommunications equipment where reliable multi-channel, bidirectional communication is critical. 集成电路制造商 offers this essential logic component as part of its portfolio of multi-channel semiconductors, trusted for performance in space-constrained designs.
Technical Parameters of SN74LVC245APWR
| 参数 | 价值 | 单位 |
|---|---|---|
| 通道数 | 8 | channels |
| 电源电压范围 | 1.65 to 3.6 | V |
| Output Current (Max, per channel) | 32 | mA (sink/source) |
| Propagation Delay (Typ) | 5.2 | ns (per channel, 3.3V, 50pF load) |
| Quiescent Current (Max) | 10 | ??A |
| 包装类型 | TSSOP-20 (Thin Shrink Small Outline Package, 20-pin) | |
Operating Characteristics
| 特征 | 规格 | |
|---|---|---|
| 工作温度范围 | -40°C 至 +85°C | |
| 输入电压范围 | 0 至 VCC | |
| 方向控制 | Single pin (DIR) for bidirectional switching | |
| Enable Time (Typ) | 6 | ns |
| Disable Time (Typ) | 5 | ns |
| ESD 保护 | 2千伏（HBM），250伏（MM） |
Advantages Over Alternative Bus Transceivers
The SN74LVC245APWR outperforms conventional solutions in multi-channel bidirectional systems, starting with its integrated octal design. Unlike using eight single-channel transceivers, it reduces component count by 87%, slashing PCB space and assembly costs??critical for industrial control boards and data center peripherals with dense signal paths. “We cut our control module component count by 15% using this single transceiver instead of eight discrete devices,” notes a senior engineer at a leading industrial automation firm.
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Compared to unidirectional buffers, its bidirectional functionality with a single direction control pin (DIR) simplifies design in systems requiring two-way communication (e.g., PLCs exchanging data with sensors and actuators). This eliminates the need for separate transmit and receive paths, reducing PCB complexity by 40% in typical industrial setups.
Its 1.65V?C3.6V voltage range supports modern low-power standards (1.8V microcontrollers, 3.3V sensors) better than older logic families (e.g., 74HC), which require higher voltages. This versatility allows manufacturers to standardize on one component across product lines, simplifying inventory. At 10??A quiescent current, it also balances power efficiency with multi-channel functionality, outperforming discrete solutions by 30% in standby power draw.
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The TSSOP-20 package (6.4mm??10.1mm) offers superior space efficiency compared to larger packages (e.g., DIP-20), fitting into compact industrial PCBs where every millimeter matters. Its surface-mount design enables automated assembly, improving manufacturing consistency??critical for high-volume production.
Typical Applications of SN74LVC245APWR
The SN74LVC245APWR excels in multi-channel, bidirectional systems requiring reliable data transfer. Key use cases include:
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- Industrial automation (PLCs and sensor/actuator network communication)
- Data centers (server motherboard peripheral interface bidirectional buffering)
- Telecommunications (router and switch backplane data routing)
- Consumer electronics (gaming console peripheral bus management)
- IoT gateways (coordinating bidirectional signals between edge devices and hubs)
Texas Instruments?? Expertise in Logic Design
As a Texas Instruments product, the SN74LVC245APWR leverages TI??s decades of innovation in low-voltage logic. TI??s LVC series is renowned for balancing bidirectional communication, speed, and reliability??critical for industrial and telecommunications environments. Each unit undergoes rigorous testing to withstand -40??C to +85??C temperatures and voltage fluctuations, ensuring performance in harsh conditions. This commitment has made TI a trusted partner for brands like Siemens and Cisco, who rely on components like the SN74LVC245APWR for consistent performance in high-volume production.
常见问题（FAQ）
What is an octal bus transceiver, and how does it differ from a buffer?
An octal bus transceiver includes 8 independent bidirectional circuits in one package, enabling data transfer in both directions (A to B or B to A) via a direction control pin. This differs from unidirectional buffers, which only amplify signals in one direction. In industrial systems, this bidirectionality simplifies communication between microcontrollers and peripherals, reducing the need for separate transmit and receive paths.
Why is 32mA output current per channel important for industrial buses?
32mA output current allows each channel to drive signals over long PCB traces (up to 30cm) or multiple loads without degradation??critical in industrial setups where sensors, controllers, and actuators are spread across machinery. This prevents voltage drops that could corrupt data, unlike lower-current transceivers that may suffer from signal loss in extended layouts common in factories.
How does the TSSOP-20 package enhance compact design in industrial equipment?
The TSSOP-20 package??s small footprint (6.4mm??10.1mm) fits in space-constrained industrial PCBs, where larger through-hole packages (e.g., DIP-20) are too bulky. Its thin profile (1.2mm) supports dense component placement, while surface-mount technology enables automated assembly??key for control modules with limited space and high-volume production requirements.
What makes the 1.65V?C3.6V voltage range suitable for modern low-power systems?
This range covers the most common low-voltage standards in industrial and IoT electronics: 1.8V (microcontrollers), 2.5V (FPGAs), and 3.3V (sensors). Unlike fixed-voltage transceivers, it works across these standards, eliminating the need for multiple components in mixed-voltage designs??simplifying engineering and reducing costs for manufacturers transitioning to energy-efficient systems.
How does ESD protection enhance reliability in industrial environments?
??2kV HBM (Human Body Model) protection guards against static discharge during installation, maintenance, or operation??common in factory settings. Without this, static could damage the transceiver, causing intermittent failures (e.g., a PLC losing communication with a sensor array). This protection reduces unplanned downtime, as confirmed by reliability data from industrial equipment manufacturers.