ISL8490IB - 5V Low-Power RS-485/RS-422 Transceiver | Renesas
부품 번호: ISL8490IB ✓ 활성ISL8490IB 개요
An RS-485 transceiver converts logic-level digital information into differential signals suitable for balanced industrial communication cables. Differential signaling provides resistance to common-mode noise and allows communication over longer cable runs than a single-ended interface. An RS-422 transceiver similarly uses differential signaling, normally in a point-to-point topology. The ISL8490IB therefore serves as an interface between a digital controller or host and physical copper wiring while placing the high-voltage, high-current bus activity on the transceiver side of the circuit.
The principal verified feature is its 5V supply operation. This places it among low-voltage CMOS interface devices intended for systems with compatible digital logic rails. The part is described as low power and as supporting either high-speed or slew-rate-limited communication. High-speed operation prioritizes data throughput, while slew-rate limiting reduces transition-edge energy and can help control electromagnetic interference and ringing on slower networks. Exact data-rate, supply-current, differential-output, input-threshold, and temperature-range values must be confirmed in the manufacturer datasheet before a design is released.
Typical uses include industrial RS-485 links, point-to-point RS-422 interconnects, instrumentation, factory automation, building controls, and embedded communication networks. In each case, the transceiver is placed between the controller UART or logic interface and the A/B differential pair. Appropriate cable routing, common-mode grounding, surge protection, termination, and fail-safe biasing remain important parts of the complete interface.
Designers should preserve the exact pin mapping and verify the required driver-enable, receiver-enable, termination, and exposed-pad details against the ISL8490 manufacturer datasheet. This page consolidates verified product identity, package information, source links, application guidance, and engineering considerations that are not presented together on a basic distributor listing.
드롭인 대체품: ISL8490IB — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
ISL8490IBZ-T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISL8490IB 사양
| 공급 전압 | 5 V |
| Supported Standards | RS-485 and RS-422 |
| Transceiver Configuration | Single transceiver |
| Power Class | Low power |
| Data-Rate Mode | High speed or slew-rate limited |
| Signal Type | Differential balanced signaling |
| 패키지 | 8-SOIC (0.154 in, 3.90 mm width) |
| 핀 수 | 8 pins |
| 실장 유형 | Surface mount |
| Logic Supply Family | CMOS, 5 V powered |
| Manufacturer | Intersil / Renesas Electronics |
ISL8490IB 8-soic (0.154 in, 3.90 mm width) 핀 구성 가이드
ISL8490IB(8-soic (0.154 in, 3.90 mm width) 패키지)의 핀 구성입니다. 핀 번호, 기능, 연결 다이어그램은 제조사 데이터시트에 정의되어 있습니다. 정확한 풋프린트와 솔더링 지침은 해당 문서를 참조하십시오.
다음에 대한 상세 핀아웃 데이터 없음: ISL8490IB.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
ISL8490IB 적합 용도: 6 애플리케이션s: Industrial RS-485 Automation Networks, Point-to-Point RS-422 Data Links, Building and HVAC Control Networks, Instrumentation and Sensor Networks, Embedded Serial Communication Interfaces, Slew-Rate-Limited Low-EMI Networks.
Industrial RS-485 Automation Networks
The ISL8490IB fits industrial automation links that require a 5V RS-485 interface and differential balanced signaling. It is placed between the controller UART and the A/B bus pair, where its low-power operation supports compact control equipment. The verified family information confirms RS-485 compatibility but does not provide the maximum data rate, common-mode range, or operating temperature, so those limits must be checked from the manufacturer datasheet. Cabling, grounding, termination, and transient protection should be designed separately rather than assumed from the transceiver designation.
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Point-to-Point RS-422 Data Links
The ISL8490IB is appropriate for point-to-point RS-422 equipment links that need balanced signaling at a 5V interface supply. Place it between the transmitting logic and the twisted pair, and use the receiver section for the return channel. The family supports both high-speed and slew-rate-limited operation, allowing the final configuration to follow the verified datasheet limits and the cable characteristics. Exact logic thresholds, differential output levels, and propagation timing are not supplied here and should be reviewed before signaling margins are assigned.
추천
Building and HVAC Control Networks
The ISL8490IB can connect a low-voltage controller to a balanced building-control bus where RS-485 compatibility and low-power operation are useful. Its 8-SOIC format supports compact PCB layouts, while differential signaling helps reject common-mode noise found around motors, relays, and long building wiring. The selection must remain conditional on verified temperature and ESD ratings. Add surge protection, maintain a defined reference ground, and avoid using transceiver logic pins as substitutes for a dedicated industrial surge-protection network.
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Instrumentation and Sensor Networks
ISL8490IB fits instrumentation buses where a sensor controller must exchange data over a noisy industrial cable. The transceiver converts single-ended digital signals into differential RS-485 or RS-422 signaling, improving noise immunity relative to a direct logic-level connection. The 5V low-power operation is useful for distributed modules with constrained power budgets. Before deployment, confirm receiver sensitivity, common-mode range, and temperature performance from the original datasheet, then design termination and fail-safe biasing for the exact network topology.
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Embedded Serial Communication Interfaces
The ISL8490IB bridges a microcontroller or processor UART to an external balanced cable. Its single-transceiver arrangement can support one transmit and one receive differential channel, making it suitable for compact embedded modules that need standard RS-485 or RS-422 connectivity. Use the enable and mode-control functions exactly as shown in the manufacturer pinout because their logic levels and timing are not present in the supplied snippets. Keep the digital trace short and route the differential pair as a coupled pair on the PCB.
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Slew-Rate-Limited Low-EMI Networks
The ISL8490IB is a candidate for slower balanced networks where reduced edge speed can help limit EMI and ringing. Its verified family description explicitly supports a slew-rate-limited mode, but the applicable data rate and timing specifications must be read from the manufacturer datasheet rather than inferred. Keep the differential trace geometry consistent, avoid long stubs, and validate the completed board with an oscilloscope or EMC pre-compliance measurement. This approach can improve implementation practicality where uncontrolled fast edges would otherwise create unnecessary cable harmonics.
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추천 제품 요약
엔지니어링 참조 데이터: ISL8490IB — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ISL8490IBZ-T |
|---|---|---|
| Package | 8-SOIC (0.154 in, 3.90 mm width) | 8-SOIC |
| Brand | Renesas Electronics / Intersil | Intersil / Renesas Electronics |
| Supply Voltage | 5 V | 5 V |
| Supported Standards | RS-485 and RS-422 | RS-485 and RS-422 |
| Transceiver Configuration | Single transceiver | Single transceiver |
| Power Class | Low power | Low power |
| Operating Mode | High speed or slew-rate limited | High speed or slew-rate limited |
| Pin Compatibility | 8-SOIC baseline | Reported complete replacement with consistent terminals |
| Price Tier | Quotation required; no verified numeric price | Quotation required; no verified numeric price |
주요 차별점
- Documented same-package replacement path (vs ISL8490IBZ-T)
- Supports two communication operating approaches (vs ISL8490IBZ-T)
- Compact standardized interface footprint (vs ISL8490IBZ-T)
설계 노트
Route the A/B or differential bus as a tightly coupled pair and keep the transceiver close to the cable connector. Avoid adding unterminated branch stubs because they can create reflections and degrade the usable communication distance. The verified material identifies the part as an 8-SOIC differential transceiver but does not provide a complete footprint or pin map, so use the exact manufacturer drawing and verify pad and paste geometry during PCB release.
Do not assume that every ISL8490 suffix has identical procurement or thermal characteristics. The verified cross-reference reports ISL8490IBZ-T as a complete replacement with matching terminals and package, but the ordering code, reel format, temperature grade, and date-code policy should still be confirmed. Also verify enable polarity and receiver/driver control states from the datasheet rather than copying them from another RS-485 transceiver.
Select the communication rate and termination strategy with cable length, node count, and edge rate in mind. The family supports high-speed and slew-rate-limited modes, but the permitted data rate and timing must come from the manufacturer datasheet. Keep protective devices outside the high-speed differential path where possible, provide a controlled ground reference, and validate the finished interface for emissions and susceptibility under the applicable system standard.
Provide a clean 5V rail and place the required bypass capacitor at the supply pins with a short, low-inductance return path. The supplied snippets do not state supply-current limits or decoupling values, so these must be taken directly from the original ISL8490 datasheet. Confirm logic-level compatibility with the controller and account for the transceiver's enabled and disabled current when estimating power-budget margins.
규정 준수 정보
The supplied verified snippets do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred from the manufacturer name.
