SP490EN-L/TR - 5Mbps RS-485/RS-422 Transceiver | MaxLinear (Tape & Reel)
Артикул: SP490EN-L/TR ✗ Снят с производстваSP490EN-L/TR Обзор
An RS-485/RS-422 transceiver is an interface IC that converts single-ended logic signals into differential signals for balanced wired communication and converts received differential signals back into logic-level data. The differential signal path improves noise immunity and allows communication across longer cable runs than ordinary single-ended interfaces. SP490EN-L/TR sits within the interface-IC hierarchy as a bus transceiver for industrial, instrumentation, and data-communication equipment.
The SP490EN-L/TR combines one differential driver and one differential receiver in a full-duplex arrangement. Its low-power BiCMOS implementation is intended for 5 V systems and supports data rates up to 5 Mbps. The receiver sensitivity of ±200 mV helps recognize small differential signals, while the wide common-mode range allows useful operation in electrically noisy environments when the board and cabling are designed appropriately. The SP491 is identified by the datasheet as functionally similar but adds driver and receiver tri-state enable lines, so it is not used as a direct substitute here.
Typical applications include RS-485 field-bus links, industrial control and test equipment, point-to-point RS-422 links, data acquisition systems, and communication links between separated circuit boards. The full-duplex arrangement is useful where transmit and receive paths must operate independently, although the SP490EN-L/TR does not provide the explicit tri-state enable controls associated with SP491. Cable length and data rate must be selected together because transmission-line losses, termination, stub effects, and common-mode limits can reduce the usable cable distance.
For PCB design, keep the differential pair impedance-controlled and route the driver and receiver connections according to the system’s cable and termination strategy. Place termination and protection components close to the transceiver pins, and verify that the selected protection network does not degrade the receiver’s differential sensitivity or data-rate margin. Power-supply bypassing should be placed directly beside the device supply pins. The verified data does not provide exact absolute maximum ratings, propagation-delay limits, receiver common-mode limits, or package dimensions, so those values should be taken from the MaxLinear datasheet before final design release.
Аналоги без доработки для SP490EN-L/TR — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
SP491EN-L
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
LTC490IS8#PBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX488ECSA+
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SP490EN-L/TR Характеристики
| Product Type | RS-485/RS-422 differential line transceiver |
| Number of Drivers | 1 driver |
| Number of Receivers | 1 receiver |
| Duplex Mode | Full duplex |
| Supported Standards | RS-485 and RS-422 |
| Maximum Data Rate | 5 Mbps |
| Напряжение питания | 5 V |
| Receiver Input Sensitivity | ±200 mV |
| Common-Mode Range | Wide common-mode range; exact limits not specified in provided data |
| Диапазон рабочих температур | -40°C to +85°C |
| Корпус | 8-pin narrow SOIC |
| Тип монтажа | Surface mount |
| Driver/Receiver Architecture | Low-power BiCMOS |
| Enable Inputs | No explicit driver or receiver tri-state enable inputs |
| Bus Communication | Differential balanced signaling |
| Manufacturer Datasheet | SP490/SP491 data sheet |
Руководство по цоколевке SP490EN-L/TR в корпусе 8-pin narrow soic
Цоколевка для SP490EN-L/TR (корпус 8-pin narrow soic). Нумерация выводов, функции и схемы подключения определены в техническом описании производителя. Обратитесь к нему для точного посадочного места и рекомендаций по пайке.
Нет подробных данных о распиновке для SP490EN-L/TR.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
SP490EN-L/TR подходит для 6 применениеs: Industrial RS-485 Field-Bus Links, Point-to-Point RS-422 Data Links, Data-Acquisition Equipment, Test and Measurement Communication, Industrial Control Signal Distribution, Board-to-Board Communication.
Industrial RS-485 Field-Bus Links
The SP490EN-L/TR fits point-to-point or multi-drop RS-485 links that need one differential driver and one differential receiver at rates up to 5 Mbps. Its ±200 mV receiver sensitivity helps recover small differential signals on a balanced pair, while the low-power BiCMOS design supports compact 5 V interface sections. Place the transceiver near the cable connector and use a protection network appropriate to the installation. Verify common-mode limits, cable length, termination, and grounding before treating the 5 Mbps rating as usable across the complete bus.
Рекомендуется
Point-to-Point RS-422 Data Links
The SP490EN-L/TR is appropriate for full-duplex RS-422 communication between two circuit boards or equipment locations. Separate differential transmit and receive paths provide independent bidirectional operation, while the 5 V supply simplifies integration with 5 V logic. The 5 Mbps maximum data rate is useful for moderate-speed command and telemetry links. In a point-to-point design, route the differential pair with controlled impedance, provide terminations according to the cable model, and avoid adding unnecessary stubs that can reflect data-edge energy back toward the transceiver.
Рекомендуется
Data-Acquisition Equipment
The SP490EN-L/TR can connect a remote sensor or measurement module to a data-acquisition unit over a balanced RS-485 or RS-422 cable. The differential receiver’s ±200 mV sensitivity and 5 Mbps capability allow the interface to carry serialized measurement data reliably when the cable and termination are correctly designed. Use the same pair for transmit commands and receive data where full duplex is required. For hazardous or electrically noisy installations, add appropriately rated surge protection and consider galvanic isolation outside the transceiver.
Рекомендуется
Test and Measurement Communication
The SP490EN-L/TR can serve as the physical communication layer in test equipment that exchanges commands and results between a controller and an instrument. Its one-driver/one-receiver full-duplex arrangement is useful for continuous control traffic, and its 5 Mbps rate exceeds the needs of many low-bandwidth measurement protocols. Keep the analog and digital return paths controlled in the PCB stack-up, terminate the cable according to the instrument specification, and validate operation across all cable lengths and grounding conditions.
Рекомендуется
Industrial Control Signal Distribution
The SP490EN-L/TR can connect a controller to a remote actuator, sensor, or I/O module over a balanced communication pair. Differential signaling improves immunity to common-mode noise compared with a single-ended interface, which is valuable around motors, relays, and switching power converters. The 5 V supply is convenient for embedded 5 V control electronics. Add surge and ESD protection at exposed connectors, maintain a defined ground strategy, and confirm that the transceiver’s operating temperature and communication rate suit the machine environment.
Рекомендуется
Board-to-Board Communication
The SP490EN-L/TR can provide a robust differential link between two circuit boards when a balanced cable or controlled board-to-board interconnect is required. The full-duplex topology supports simultaneous transmit and receive traffic, and the 5 V operation avoids requiring a separate high-voltage interface supply. For short board-to-board routes, still evaluate connector pin assignments, return-path continuity, impedance, and ESD exposure. For longer cables, treat the link as a transmission-line system and apply appropriate termination.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для SP490EN-L/TR — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | SP491EN-L | LTC490IS8#PBF | MAX488ECSA+ |
|---|---|---|---|---|
| Brand | MaxLinear | MaxLinear | Linear Technology | Maxim Integrated |
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 |
| Transceiver Configuration | 1 transmitter / 1 receiver | Related 1 transmitter / 1 receiver family; enable lines added | RS-485/RS-422 transceiver | RS-485/RS-422 transmitter/receiver |
| Supported Standards | RS-485 and RS-422 | RS-485 and RS-422 | RS-485/RS-422 | RS-485/RS-422 |
Ключевые отличия
- Higher verified maximum data rate than the listed MAX488ECSA+ comparison candidate (против MAX488ECSA+)
- No explicit tri-state enable lines (против SP491EN-L)
- Verified ±200 mV receiver sensitivity (против LTC490IS8#PBF)
Заметки по проектированию
Route the differential pair as a controlled-impedance pair with continuous return-path planning. Avoid splitting the driver and receiver routing across unrelated layers or around split planes. If the cable is electrically long relative to the 5 Mbps edge rate, use termination and protection components selected from the cable and transceiver requirements, and verify reflections and attenuation with the complete interconnect.
Place the transceiver close to the connector or cable interface so that high-frequency transient energy is absorbed before it propagates through the board. Keep bypass capacitance close to the supply and ground pins, and place ESD or surge protection at the entry point. Confirm that the protection network remains compatible with the differential data rate and receiver sensitivity.
Do not substitute SP491 for SP490 without reviewing the pin functions. The verified MaxLinear description says SP491 adds driver and receiver tri-state enable lines, while SP490EN-L/TR does not have those explicit controls. Likewise, a related SOIC-8 transceiver is not automatically drop-in compatible; verify pin names, voltage tolerances, receiver thresholds, timing, and enable behavior before production use.
Use a continuous ground reference beneath the interface and maintain a deliberate grounding strategy between the transceiver, cable shield, and chassis or protective earth. Differential signaling reduces common-mode noise but does not eliminate radiated or conducted emissions. Keep switching regulators and high-current return paths away from the differential pair, and evaluate the complete system for EMC compliance.
Информация о соответствии
The supplied verified data does not explicitly establish RoHS, REACH, lead-free, halogen-free, or conflict-minerals status for SP490EN-L/TR. AEC-Q100 is treated as not applicable because no automotive qualification claim was provided.
