ISL8485IP - 5Mbps RS-485/RS-422 Transceiver | Renesas
MPN： ISL8485IP ✓ 啟用中ISL8485IP 概覽
An RS-485/RS-422 transceiver is an interface IC that converts digital logic-level signals into differential signals for balanced wired communication and converts received differential signals back into logic levels. RS-422 supports point-to-point balanced links, while RS-485 permits multipoint buses and driver-enable control. The ISL8485IP belongs to the transceiver hierarchy within interface ICs and combines transmitter, receiver, bus-enable control, and protection functions in one package.
Key features include a 5Mbps maximum data rate, 4.5V to 5.5V supply tolerance, one-unit-load bus loading, and support for both RS-485 and RS-422 signaling. The 8-pin DIP package is suitable for conventional through-hole assembly, prototyping, repair, and industrial control equipment. Its half-duplex arrangement allows the same differential pair to transmit and receive, although external direction-control logic is normally required.
The BiCMOS architecture combines bipolar and CMOS characteristics to provide low-power operation with high data-rate capability. According to the Renesas ISL8485 family information, the ISL8485, ISL8490, and ISL8491 devices are 5V-powered single transceivers that meet RS-485 and RS-422 standards. The family supports supply voltages with 10% tolerance and presents one unit load to the RS-485 bus, helping control loading when multiple nodes share a communication line.
Typical applications include industrial factory automation, programmable-logic-controller communication, building-control networks, instrumentation links, and embedded serial-interface equipment. In these systems, the transceiver serves as the physical-layer interface between a controller UART or logic port and a balanced RS-485 or RS-422 cable. Its 5Mbps capability supports high-speed equipment links, while slew-rate-controlled variants in the broader family can be useful where lower EMI is the priority.
PCB design should preserve the differential signal path and provide controlled termination and biasing appropriate to the selected RS-485 or RS-422 topology. Keep the transceiver close to the connector, route the differential pair as a coupled pair, and place termination components where they can be configured for the intended network. The maximum 5.5V supply is especially important in industrial systems because transients and supply tolerances must remain within the device rating.
This product page combines verified distributor identification, package and interface details, family-level electrical characteristics, alternative sourcing information, and application-specific engineering guidance. It also distinguishes explicitly verified facts from parameters that require confirmation from the manufacturer datasheet before schematic release or production qualification.
直接替換替代品，適用於 ISL8485IP — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ISL8485IP （相同外形與佔位） — 差異在於 Manufacturer, Maximum Data Rate, Package, Product Type, Supply Voltage.
ISL8490IP
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ISL8491IP
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →SN75176AP
✅ 直接替換📋 參考替代品（不在目錄中）
SP485ES-L
✅ 直接替換📋 參考替代品（不在目錄中）
ISL8485IP 規格
| Product Type | RS-485/RS-422 transceiver |
| Manufacturer | Renesas Electronics |
| Transceiver Configuration | 1 transceiver, half-duplex |
| 供應電壓 | 4.5V to 5.5V |
| Nominal Supply Voltage | 5V |
| Maximum Data Rate | 5Mbps |
| Supported Standards | RS-485 and RS-422 |
| RS-485 Bus Loading | 1 unit load |
| Logic Family | BiCMOS |
| 封裝 | 8-pin DIP (8-PDIP) |
| 安裝類型 | Through-hole |
ISL8485IP 8-pin dip (8-pdip) 腳位配置指南
ISL8485IP（8-pin dip (8-pdip) 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： ISL8485IP.
請參閱 資料表 以查看完整腳位配置。
典型應用
ISL8485IP 適用於 6 應用s: Industrial PLC Communication, Factory Automation Bus, Building Control Networks, Instrumentation and Data Acquisition, Embedded Equipment Interfaces, Legacy Communication Equipment.
Industrial PLC Communication
The Renesas ISL8485IP fits half-duplex RS-485 links between a PLC and remote I/O, operator panels, or motor-control equipment. Its verified 5Mbps maximum data rate supports fast communication cycles, while the 4.5V-to-5.5V supply range accommodates regulated 5V industrial rails. The device presents one unit load to the bus, which simplifies node-count planning when combined with the loading of the other installed transceivers. In a typical design, the PLC UART connects to the transceiver logic pins and an external driver-enable signal controls transmit versus receive intervals.
推薦
Factory Automation Bus
The ISL8485IP is suitable for factory automation equipment that exchanges control and diagnostic data over balanced RS-485 wiring. Its verified 5Mbps capability is valuable for short, well-controlled links carrying frequent process updates, while the half-duplex topology requires deterministic bus-direction control. The 8-pin DIP package is practical for legacy machinery and repair boards where through-hole construction is common. Designers should calculate the cable budget, termination strategy, common-mode range, and grounding arrangement before using high data rates on long factory cables.
推薦
Building Control Networks
The ISL8485IP can connect a building controller to distributed sensors, actuators, lighting modules, or access-control equipment using RS-485. Its one-unit-load bus behavior is important when several nodes share the wiring, and the 5Mbps rate provides ample physical-layer headroom for many control protocols. Because building installations vary in cable length and noise, engineers should select termination and fail-safe bias values for the actual topology and validate the transceiver against the protocol's timing requirements.
推薦
Instrumentation and Data Acquisition
The ISL8485IP is appropriate for laboratory and industrial instrumentation that must transfer commands and measurements between a controller and remote analog or digital acquisition modules. The verified 5Mbps maximum rate supports high-volume serial transfers, and the half-duplex architecture can share one balanced pair for transmit and receive operation. Its 5V supply tolerance permits use with conventional regulated laboratory rails. Designers should keep the differential route away from switching-node wiring and verify receiver thresholds, isolation requirements, and grounding when the instrument uses a separate power domain.
推薦
Embedded Equipment Interfaces
The ISL8485IP can bridge a microcontroller or processor UART to an RS-485 or RS-422 physical layer in embedded equipment. Its low-power 5V architecture is suited to established control boards, and the 8-pin DIP format allows straightforward assembly in prototypes or repair-oriented products. The transceiver handles differential signaling but not protocol framing, so the host controller must handle addresses, timing, collision avoidance, and direction control. Firmware should prevent transmit-enable overlap and provide controlled turnaround between transmission and reception.
推薦
Legacy Communication Equipment
The ISL8485IP is a practical choice for maintaining or repairing legacy 5V equipment that uses an 8-pin half-duplex RS-485/RS-422 transceiver position. Its through-hole DIP package aligns with older through-hole boards and simplifies socket-level replacement where appropriate. The 5Mbps rating covers many short industrial communication ports, while the one-unit-load specification supports shared-bus planning. Before installation, technicians should compare the original device's enable polarity, receiver fail-safe behavior, driver strength, and pin names because the verified excerpts do not provide a complete cross-manufacturer pin table.
推薦
推薦產品摘要
工程參考資料，適用於 ISL8485IP — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ISL8490IP | ISL8491IP | SN75176AP | SP485ES-L | SP485CS-L |
|---|---|---|---|---|---|---|
| Package | 8-pin DIP (8-PDIP) | 8-pin DIP (8-PDIP) | 8-pin DIP (8-PDIP) | 8-pin DIP (8-PDIP) | 8-pin DIP (8-PDIP) | 8-pin DIP (8-PDIP) |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Texas Instruments | Exar | Exar |
| Transceiver Configuration | 1 transceiver, half-duplex | Single half-duplex transceiver | Single half-duplex transceiver | Differential bus transceiver | RS-485/RS-422 transceiver | RS-485/RS-422 transceiver |
| Supported Standards | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 and RS-422 | RS-485/RS-422 candidate | RS-485/RS-422 | RS-485/RS-422 |
主要差異化特點
- Verified high-speed capability (對比SP485ES-L)
- Documented supply tolerance (對比SN75176AP)
- One-unit-load RS-485 bus loading (對比SP485CS-L)
- Same-brand family integration (對比ISL8490IP)
設計說明
Route the differential pair as a tightly coupled pair from the transceiver pins to the connector or isolation barrier, and minimize stub branches. Keep the transceiver close to the connector to reduce exposed trace length, while separating it from switching regulators and high-current inductors. The ISL8485IP supports data rates up to 5Mbps, but edge rates can be much faster than the data rate, so return paths and ground references must remain continuous across the board.
Do not substitute the part based only on the 8-pin DIP outline. Verify the numbered pin functions, transmit-enable polarity, receiver enable behavior, driver strength, receiver thresholds, and shutdown-control implementation. The verified excerpts establish the package and broad RS-485/RS-422 function but do not provide a full cross-manufacturer pin table. Confirm those details in each candidate's datasheet before approving a drop-in replacement.
Select termination and fail-safe biasing for the actual network topology rather than copying a universal resistor arrangement. Place termination at the physical ends of the cable, and determine whether the selected protocol or transceiver configuration includes internal fail-safe bias. Because the ISL8485 supports a 5Mbps rate, excessive edge energy can couple into adjacent cables or measurement circuits even when the average data traffic is low.
Operate the ISL8485IP only within its verified 4.5V-to-5.5V supply range. Place normal bypass capacitance close to the device supply and ground pins according to the manufacturer guidance, while keeping the connector-side surge path away from sensitive logic. Industrial systems may experience supply transients, so verify whether the selected board also requires external overvoltage, undervoltage, or surge protection rather than assuming the transceiver itself provides it.
合規資訊
The verified excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields require confirmation from the current Renesas product documentation or manufacturer declarations.
