ISL8491IP - 5V 5Mbps RS-485/RS-422 Transceiver | Renesas
料号： ISL8491IP ✗ 停产ISL8491IP 概述
An RS-485/RS-422 transceiver is an interface IC that converts logic-level signals into differential balanced signals for reliable data transmission over cables. These differential signaling methods are members of the broader interface-controller category, connect digital systems to physical communication links, and provide improved noise immunity compared with single-ended logic interconnects. The ISL8491IP supports both protocols, allowing equipment designers to select the appropriate termination and biasing arrangement for the cable and system topology.
The verified part data identifies a 4.5 V to 5.5 V supply range, 5 Mbps maximum data rate, 70 mV receiver hysteresis, one transmitter, one receiver, full duplex, and an operating temperature range of -40°C to 85°C. These characteristics suit industrial equipment operating near a regulated 5 V rail and requiring communication speeds up to 5 Mbps. The through-hole PDIP-14 package is also appropriate for leaded PCB designs where a small surface-mount land pattern is not required.
The ISL8491IP is listed as obsolete in the verified source data. Consequently, engineers should not assume that new production procurement is available and should confirm lifecycle status, traceability, and last-time-buy opportunities directly with the manufacturer or an authorized distributor. Renesas Electronics Corporation is the listed supplier, while the original documentation is associated with Intersil Corporation.
Typical uses include industrial control links, factory automation equipment, remote sensor interfaces, RS-422 point-to-point links, and test-and-measurement systems. In these applications, the device separates the logic domain from the noisy cable environment through differential transmission and reception. Cable length, data rate, termination, common-mode range, and grounding remain system-level constraints that must be evaluated separately from the integrated circuit specifications.
A practical design step is to preserve the transmitter enable and receiver enable control paths, place termination only where required by the cable topology, and provide a stable 5 V supply close to the device. Since the verified sources do not provide a complete pin table, absolute maximum ratings, output current, or detailed electrical characteristics, those values should be confirmed in the manufacturer datasheet before final release.
This page combines verified distributor and datasheet information with lifecycle, sourcing, application, and design guidance. It also distinguishes verified facts from parameters that still require manufacturer-document confirmation, helping engineers evaluate the ISL8491IP without confusing an obsolete status with an interchangeable modern replacement.
直接替换替代料： ISL8491IP ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ISL8491IP （相同外形与封装尺寸） ——差异在于 Number of Drivers, Number of Receivers, Package, Product Type.
该产品暂无直接替换替代料。
请求替代料ISL8491IP 规格参数
| Product Type | RS-485/RS-422 line transceiver |
| Number of Drivers | 1 driver |
| Number of Receivers | 1 receiver |
| Duplex Mode | Full duplex |
| Supported Protocols | RS-422 and RS-485 |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Nominal Supply Voltage | 5 V |
| Maximum Data Rate | 5 Mbps |
| Receiver Hysteresis | 70 mV |
| 工作温度范围 | -40°C to +85°C |
| 安装类型 | Through-hole |
| 封装 | 14-pin PDIP |
| IC Type | CMOS line transceiver |
| Logic Family | CMOS |
ISL8491IP 14-pin pdip 引脚配置指南
ISL8491IP（14-pin pdip 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： ISL8491IP.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ISL8491IP 适用于 6 应用s: Industrial Control Bus, RS-422 Point-to-Point Link, Remote Sensor Interface, Factory Automation Equipment, Test and Measurement Equipment, Low-Speed Industrial Telemetry.
Industrial Control Bus
The ISL8491IP fits legacy factory-control equipment that uses a 5 V RS-485 differential bus for communicating sensor readings, actuator commands, and equipment status. Its 5 Mbps maximum data rate, full-duplex operation, 4.5 V to 5.5 V supply range, and -40°C to +85°C operating range support industrial temperature conditions. The transceiver separates logic signals from the balanced cable interface, improving noise immunity over long installations. Before adoption, verify common-mode limits, termination values, and ESD requirements in the datasheet. Because the device is obsolete, new deployments should include a documented last-time-buy or alternate-part plan rather than depend on open-market availability.
推荐
RS-422 Point-to-Point Link
The ISL8491IP is suitable for a point-to-point RS-422 connection between two circuit boards, a controller and remote data-acquisition unit, or laboratory equipment over a balanced cable. Full-duplex operation allows separate transmit and receive paths, while the 5 Mbps data-rate capability is substantially above typical low-speed field-bus traffic. Its 5 V supply range also integrates naturally with older CMOS logic systems. Cable length and data rate must be evaluated together rather than using the maximum rate as an unconditional distance specification. Termination, biasing, grounding, and driver enable sequencing should follow the verified application guidance in the manufacturer datasheet.
推荐
Remote Sensor Interface
The ISL8491IP can connect a remote sensing assembly to a central controller when the sensor output must traverse an electrically noisy cable. Differential RS-422 signaling reduces susceptibility to externally induced noise, and the device's one-driver, one-receiver full-duplex configuration supports continuous command and measurement paths when the wiring provides separate pairs. The transceiver's 70 mV receiver hysteresis helps distinguish signal states amid noise, subject to the complete input-sensitivity specification. Engineers should verify the supported common-mode range, external protection, and ESD requirements before connecting long field wiring. The obsolete lifecycle status requires sourcing and design-change review.
推荐
Factory Automation Equipment
ISL8491IP-based interfaces can support legacy production equipment that exchanges commands and diagnostics between a controller and distributed modules. The 5 Mbps rate offers ample bandwidth for short control links, while RS-485's differential signaling is better suited to factory environments than ordinary single-ended logic. The -40°C to +85°C rating accommodates industrial ambient conditions, although the final system still requires enclosure-temperature and power-supply analysis. Confirm that the transceiver's enable timing is compatible with the controller and that the cable network uses appropriate termination and protection. For new production, compare a maintained legacy build with a footprint-redesign alternative because this MPN is obsolete.
推荐
Test and Measurement Equipment
The ISL8491IP can be used in legacy test equipment to transfer commands and results between an instrument controller and a remote measurement fixture. Full-duplex RS-422 communication is appropriate when the installation requires independent transmit and receive conductors and benefits from common-mode noise rejection. Its 5 V operation is convenient for older instrument electronics, and the 5 Mbps capability supports fast short-range data exchange. Care is required because the verified data does not specify every electrical limit, so designers should confirm input sensitivity, common-mode range, output loading, and ESD behavior directly from the datasheet. Obsolete-part procurement must also be documented.
推荐
Low-Speed Industrial Telemetry
The ISL8491IP is applicable to low-bandwidth telemetry links that carry periodic measurements or status information rather than continuous high-rate data. RS-422 differential signaling supports reliable communication over balanced wiring, and the transceiver's 70 mV receiver hysteresis provides additional state-transition margin in noisy environments. The 4.5 V to 5.5 V supply range allows operation from regulated 5 V rails, while full duplex permits simultaneous command and response traffic where four-wire wiring is practical. System designers must validate cable length, data rate, grounding, termination, and surge protection. Since the component is obsolete, production use should include an approved alternate that preserves the required pinout and environmental performance.
推荐
推荐产品汇总
工程参考数据： ISL8491IP ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 |
|---|---|
| Package | 14-pin PDIP |
| Brand | Renesas Electronics |
| Protocol Support | RS-422 and RS-485 |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Maximum Data Rate | 5 Mbps |
| Driver and Receiver Count | 1 driver and 1 receiver |
| Duplex Mode | Full duplex |
| Receiver Hysteresis | 70 mV |
| Operating Temperature Range | -40°C to +85°C |
| Mounting Type | Through-hole |
关键差异点
- Retains the original 14-pin PDIP interface footprint （对比 MAX13184EESD+)
- Provides explicit RS-422 and RS-485 protocol support （对比 MAX13184EESD+)
- Supports communication rates up to 5 Mbps （对比 MAX13184EESD+)
设计说明
Do not treat ISL8491IP and MAX13184EESD+ as interchangeable merely because both support RS-485/RS-422. The ISL8491IP uses a 14-pin PDIP footprint, while MAX13184EESD+ is an 8-pin SOIC device. Verify every signal, supply pin, enable polarity, and exposed connection against the applicable datasheet. A new PCB or carefully qualified adapter is required for the SOIC part.
Route the balanced RS-485 or RS-422 traces as a closely coupled differential pair over a continuous ground reference, and keep the transceiver interface section away from switching nodes and high-current return paths. Place termination components at the physical cable endpoints rather than adding them indiscriminately to every node. The complete ISL8491IP pinout was not available in the verified snippets, so confirm land-pattern orientation and pin numbering before fabrication.
Provide a stable 5 V supply within the verified 4.5 V to 5.5 V range and place suitable local decoupling close to the supply and ground terminals. The supplied data confirms a 5 V CMOS operating environment but does not provide the full current-limit or decoupling recommendations. Use the manufacturer datasheet to determine input capacitance, supply-current limits, and approved capacitor characteristics before finalizing the power network.
The ISL8491IP is listed as obsolete, so continuity of supply is a design risk independent of electrical compatibility. Use controlled procurement for repair quantities, obtain manufacturer lifecycle confirmation, and record traceability criteria. Avoid approving a new high-volume build without a reviewed alternate. Any substitute must be checked for package, pinout, supply voltage, logic levels, data rate, common-mode range, and transceiver enable behavior.
合规信息
The supplied verified data does not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because this is a general-purpose RS-485/RS-422 interface transceiver rather than an identified automotive-qualified variant.