SN65HVD20P - Extended Common-Mode RS-485 Transceiver | TI
MPN: SN65HVD20P ✓ Hoạt độngSN65HVD20P Tóm tắt
An RS-485 transceiver is an interface IC that converts logic-level signals between a host controller and a differential, balanced cable. The transmitter drives complementary differential outputs, while the receiver converts the differential input back into a logic signal. This differential signaling improves noise immunity over longer interconnects and is widely used in industrial automation, building controls, instrumentation, and communications equipment. The SN65HVD20 belongs to the RS-485 transceiver family within interface ICs and broader semiconductor communication devices.
The principal feature of the SN65HVD2x family is its extended common-mode range. According to the Texas Instruments SN65HVD2x datasheet, the family operates over an extended range of common-mode voltages beyond typical RS-485 devices while meeting the requirements of the TIA/EIA-485-A standard. The family also provides high ESD protection, wide receiver hysteresis, and failsafe operation, making it suitable for noisy industrial environments where ground-potential differences can occur between connected equipment.
The SN65HVD20P provides one transmit and one receive channel and operates in a half-duplex RS-422/RS-485 arrangement. Its PDIP package provides through-hole mounting and thermal reliability for industrial control equipment where surface-mount-only packages may be inconvenient. Exact propagation-delay, data-rate, common-mode, and supply-current limits should be selected against the operating requirements in the manufacturer datasheet before placing the part into a new bus design.
Typical applications include RS-485 industrial control networks, factory automation equipment, remote sensor interfaces, building-management systems, data-acquisition equipment, and communications between controller boards separated by different ground potentials. In these systems, the transceiver serves as the physical-layer interface between a microcontroller or programmable logic controller and a field bus. Cable length, topology, termination, biasing, and common-mode voltage determine whether the selected transceiver provides adequate signal margin.
For a new board, preserve the manufacturer-recommended decoupling near the supply pins, connect the driver and receiver grounds carefully, and install termination only at appropriate physical ends of the bus. The SN65HVD2x extended common-mode capability can improve tolerance to ground offsets, but it does not remove the need for twisted-pair routing, controlled-impedance layout, surge protection, and a correctly engineered bus. Use the pin-description table and application information in the manufacturer datasheet when assigning signals and defining the board footprint.
This product page combines the manufacturer identification, package information, sourcing references, drop-in replacement guidance, comparison parameters, and practical design notes needed to evaluate the SN65HVD20P for an industrial differential-communication design.
Bộ thay thế dễ dàng lắp đặt cho SN65HVD20P — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Không có bộ thay thế dễ dàng lắp đặt sẵn có cho sản phẩm này.
Yêu cầu các bộ thay thếSN65HVD20P Thông số kỹ thuật
| Product Type | RS-422/RS-485 transceiver |
| Number of Drivers | 1 driver |
| Number of Receivers | 1 receiver |
| Duplex Mode | Half-duplex |
| Supported Standards | TIA/EIA-485-A |
| ESD Protection | High ESD protection |
| Failsafe Operation | Supported |
| Hộp | PDIP-8, 8 pins |
| Kiểu lắp đặt | Through-hole |
Hướng dẫn cấu hình chân SN65HVD20P pdip-8, 8 pins
Cấu hình chân cho SN65HVD20P (pdip-8, 8 pins gói). Số thứ tự chân, chức năng và sơ đồ kết nối được xác định trong tài liệu thông số kỹ thuật của nhà sản xuất. Tham khảo nó để biết footprint và hướng dẫn hàn chính xác.
Không có dữ liệu chân cụ thể sẵn có cho SN65HVD20P.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
SN65HVD20P phù hợp cho 6 Áp dụngs: Industrial Automation Field Bus, Building Automation Controller, Remote Sensor and Data Acquisition, Factory Motor and Drive Communications, Industrial Gateway and Protocol Converter, Telecommunications and Remote Monitoring.
Industrial Automation Field Bus
The SN65HVD20P fits industrial automation field-bus nodes that connect a controller to remote actuators, sensors, or drive electronics over RS-485. Its extended common-mode range helps accommodate ground-potential differences between factory equipment, while wide receiver hysteresis improves margin in electrically noisy environments. The device provides one differential driver and one receiver for a half-duplex bus, with failsafe operation supporting defined behavior when the bus is idle or a driver is disabled. Engineers should still design termination and biasing for the complete network, route the differential pair as a twisted pair, and check the manufacturer limits for data rate, bus length, and node count.
Được đề xuất
Building Automation Controller
The SN65HVD20P is appropriate for building automation controllers that exchange commands and status with distributed HVAC, lighting, access, or environmental-monitoring modules over an RS-485 network. Extended common-mode operation provides additional tolerance for ground-offset conditions between separately powered panels, while the wide receiver hysteresis helps reject noise present on long wiring runs. Its half-duplex architecture reduces channel count compared with a full-duplex interface. The PDIP-8 package also supports through-hole assembly where component access or serviceability is important. Confirm the target baud rate, cable length, node count, and termination strategy in the manufacturer application information.
Được đề xuất
Remote Sensor and Data Acquisition
The SN65HVD20P can connect a data-acquisition controller to remote sensors over a differential RS-485 bus, especially where the remote equipment is grounded at a different potential. The transceiver’s extended common-mode range and high ESD protection improve robustness in industrial environments, while wide receiver hysteresis supports reliable detection of a small differential signal. Place the transceiver close to the connector and cable entry, maintain a continuous ground reference, and route the differential pair away from switching nodes. The bus must remain within the manufacturer’s electrical limits for data rate, common-mode voltage, cable length, and attached node count.
Được đề xuất
Factory Motor and Drive Communications
The SN65HVD20P suits communications links between a PLC or motion controller and industrial motor-drive modules where reliable differential signaling and tolerance to electrical noise are important. Its one-driver, one-receiver, half-duplex arrangement supports economical bus nodes, and the extended common-mode range helps when controller and drive cabinets have different ground potentials. High ESD protection reduces sensitivity to electrostatic discharge encountered in industrial equipment. Power-system engineers should still separate drive energy from signal wiring, use suitable protection networks where required, and validate fault behavior and bus termination with the complete drive topology.
Được đề xuất
Industrial Gateway and Protocol Converter
The SN65HVD20P can provide the physical RS-485 endpoint in an industrial gateway or protocol converter that bridges legacy field equipment to a modern controller network. The half-duplex transceiver reduces the number of interface pins needed for bidirectional bus traffic, while failsafe operation provides a controlled output state when the remote link is inactive. Extended common-mode capability is useful when field-side equipment has an independent ground reference. For gateways, place protection and filtering ahead of the transceiver, use a dedicated transceiver ground where appropriate, and confirm that bus direction control avoids contention during transmission and reception.
Được đề xuất
Telecommunications and Remote Monitoring
The SN65HVD20P is suitable for remote monitoring modules that use an RS-485 management or telemetry bus to exchange status with central equipment. Extended common-mode operation can improve tolerance to voltage differences between powered sites, and high ESD protection is valuable in equipment exposed to installation or maintenance transients. Wide receiver hysteresis supports reliable interpretation of the differential signal under noisy conditions. The designer should select baud rate and termination for the actual cable length, provide local biasing only where the bus plan requires it, and use an isolation strategy when very large ground offsets or high-surge environments make a non-isolated interface unsuitable.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho SN65HVD20P — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này |
|---|---|
| Brand | Texas Instruments |
| Package | PDIP-8, 8 pins |
| Product Type | RS-422/RS-485 transceiver |
| Number of Drivers | 1 driver |
| Number of Receivers | 1 receiver |
| Duplex Mode | Half-duplex |
| Common-Mode Range | Extended common-mode range |
| ESD Protection | High ESD protection |
| Receiver Hysteresis | Wide receiver hysteresis |
| Failsafe Operation | Supported |
| Standards Support | TIA/EIA-485-A requirements |
| Mounting Type | Through-hole |
Ghi chú thiết kế
Place the SN65HVD20P close to the RS-485 connector and the point where the cable enters the PCB. Route the A and B conductors as a tightly coupled pair on a continuous reference plane, keep their spacing consistent, and avoid stubs, test pads, and switching-node crossings. The long transceiver-to-connector path can degrade common-mode rejection and increase susceptibility to ESD, so minimize it before optimizing the internal bus layout.
Do not treat extended common-mode operation as a substitute for correct bus engineering. Match data rate to cable length, termination impedance, node count, and transceiver characteristics. Install termination only at the physical ends of the main bus, avoid star branches with long stubs, and apply biasing once in a defined location when required. Confirm driver enable and receiver-enable behavior in the manufacturer pin table before designing firmware-controlled bus turnaround.
Connect the transceiver ground reference to the equipment ground through the strategy described by the manufacturer and the system grounding architecture. If high ESD or surge energy may reach the cable, add a suitably rated protection network close to the connector and verify that it does not distort normal differential signaling. Isolation can be preferable when the connected equipment can develop large ground offsets or when regulatory requirements demand a protective barrier.
Use the supply range and decoupling recommendations stated in the Texas Instruments SN65HVD2x datasheet. Place the required bypass capacitor adjacent to the device supply pins with a short return path to ground, and account for supply noise and transients arriving through the cable interface. Validate the design across the intended supply tolerance because changes in supply voltage can affect transceiver timing, common-mode behavior, and available noise margin.
Thông tin tuân thủ
Compliance status was not stated in the accessible manufacturer and distributor records. Review the current Texas Instruments product page or material declaration before release.
