ISL8485CB - 5V 5Mbps RS-485/RS-422 Transceiver | Renesas
N.º de pieza: ISL8485CB ✓ ActivoISL8485CB Descripción general
An RS-485/RS-422 transceiver is an interface IC that converts logic-level digital signals into balanced differential signals and receives differential signals back into CMOS-compatible logic levels. The ISL8485CB belongs to the transceiver hierarchy of interface ICs, where RS-422 provides a balanced point-to-point or multidrop communication format and RS-485 supports longer, noise-tolerant multipoint buses. The part is intended for systems that require compact, reliable differential signaling rather than a single-ended communications interface.
The primary electrical attributes include a 5V supply, a 5Mbps data rate, one integrated driver, and one integrated receiver. The manufacturer family documentation identifies the ISL8485 as a CMOS 5V-powered RS-485/RS-422 transceiver family with low power consumption and both high-speed and slew-rate-limited configurations. The verified distributor description identifies the CB ordering code as an 8-SOIC, while the manufacturer document covers the related ISL8485, ISL8490, and ISL8491 family.
Typical uses include industrial control systems, factory automation, instrumentation, building automation, and embedded equipment connected through a balanced bus. In a half-duplex network, the transceiver converts transmitted data into differential bus voltage and receives remote data when the driver is disabled. The 5Mbps capability supports high-rate factory communication, while slew-rate limiting can reduce reflected signaling on longer or less controlled cables.
Designers should verify the complete pinout, enable polarity, driver and receiver disable behavior, termination requirements, and electrical limits against the Renesas datasheet before layout. RS-485 buses normally need termination at both physical ends, biasing to provide a defined idle state, and protection appropriate to the installation environment. The 8-SOIC package requires thermal and layout attention at elevated data rates or long-cable installations.
Alternativas directas para ISL8485CB — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
ISL8485IBZ-T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL8843AABZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL8843MBZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL81483IB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL8485CB Especificaciones
| Product Type | RS-485/RS-422 half-duplex transceiver |
| Tensión de alimentación | 5 V |
| Maximum Data Rate | 5 Mbps |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Logic Family | CMOS |
| Supported Standards | RS-485 and RS-422 |
| Communication Mode | Half-duplex |
| Encapsulado | 8-SOIC |
| Package Width | 3.90 mm |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Guía de configuración de pines de ISL8485CB 3.90 mm
Configuración de pines para ISL8485CB (encapsulado 3.90 mm). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para ISL8485CB.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ISL8485CB es adecuado para 6 aplicacións: Factory Automation Bus Interface, Industrial Control Cabinets, Building Automation Networks, Instrumentation and Test Equipment, Embedded Serial Communication, Communication Interfaces.
Factory Automation Bus Interface
The ISL8485CB fits factory automation links that distribute commands and collect data between a controller and remote I/O, motor-control electronics, sensors, or operator panels. Its single 5V supply and 5Mbps maximum data rate support fast differential communication over industrial cable runs. The half-duplex transceiver also reduces the component count by combining one driver and one receiver in an 8-SOIC package. In a multidrop RS-485 network, use driver-enable control to prevent multiple transmitters from driving the bus simultaneously. Termination, common-mode grounding, and surge protection should be selected for the installation environment.
Recomendado
Industrial Control Cabinets
The ISL8485CB is appropriate for PLC, data-acquisition, and control-cabinet equipment requiring an RS-485/RS-422 physical layer. Its low-power CMOS implementation is useful where several interface channels share limited board space, while the 5Mbps capability provides margin for high-rate data transfers. Place the transceiver near the connector and protected board edge to minimize exposed stub length. Verify the family’s exact operating-temperature and protection ratings before using it in extended-temperature cabinets. If the bus crosses a high-potential isolation barrier, add an appropriate isolated interface rather than relying on non-isolated protection alone.
Recomendado
Building Automation Networks
The ISL8485CB can connect building automation controllers, sensors, access equipment, and lighting modules over a balanced RS-485 network. Differential signaling reduces susceptibility to common-mode noise found near motors and fluorescent-ballast wiring, and the half-duplex arrangement supports bidirectional command and status traffic. The device’s 5V supply and 8-SOIC footprint simplify integration into compact controller boards. For long cable runs, follow the applicable RS-485 topology, terminate only the two physical ends, and provide a defined fail-safe bias. The verified source does not state a maximum cable length, so field length must be established from system margin and propagation-delay requirements.
Recomendado
Instrumentation and Test Equipment
The ISL8485CB suits laboratory instruments that exchange measurement commands and results through a compact differential interface. Its 5Mbps rate supports efficient transfer of digitized readings and configuration data, while the integrated driver and receiver reduce board area compared with separate devices. Use controlled-impedance routing where required by the system and keep the transceiver ground return closely coupled to the differential pair. Because the supplied data does not confirm common-mode rejection, input sensitivity, or maximum bus voltage, verify those limits against the Renesas datasheet before connecting long laboratory leads. External protection may also be required for user-accessible connectors.
Recomendado
Embedded Serial Communication
The ISL8485CB provides an RS-485 or RS-422 interface for embedded controllers that need a robust physical layer instead of an exposed single-ended UART connection. The 5V supply aligns with many controller boards, and the 8-SOIC package is straightforward to route in a conventional mixed-signal layout. A single half-duplex channel can be shared among multiple nodes when driver enable is sequenced correctly. Software should account for turnaround delay because the driver and receiver share the bus. Preserve the device’s operating requirements around supply sequencing and enable control, which are not fully specified in the supplied search snippets and must be confirmed in the manufacturer datasheet.
Recomendado
Communication Interfaces
The ISL8485CB is suited to RS-485/RS-422 interface cards, gateways, and communication modules that need a compact balanced-line driver and receiver. Its 5Mbps maximum rate supports demanding data transfers, and the 8-SOIC package allows direct placement near a board-edge connector. A careful layout can keep the differential traces short and symmetrical while placing termination and protection components at the connector. The part also offers the option of slew-rate-limited operation within the documented family, which may help control edge-related emissions on longer interconnects. Confirm the exact operating mode, disable polarity, and timing values from the manufacturer datasheet before publishing a replacement-board BOM.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISL8485CB — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ISL8485IBZ-T | ISL8843AABZ | ISL8843MBZ | ISL81483IB |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Interface Standard | RS-485/RS-422 | RS-485/RS-422 | RS-485/RS-422 | RS-485/RS-422 | RS-485/RS-422 |
Diferenciadores clave
- Directly identified as a 5Mbps half-duplex 8-SOIC transceiver (frente a ISL8843MBZ)
- Verified 5V supply and one-driver, one-receiver arrangement (frente a ISL81483IB)
- Cross-reference evidence supports replacement without circuit modification (frente a ISL8485IBZ-T)
Notas de diseño
Place the ISL8485CB close to the external connector and route the differential bus as a tightly coupled pair with a continuous reference plane. Keep termination, protection, and optional fail-safe bias components near the transceiver or connector according to the intended topology. Minimize stub branches because unequal stub lengths can degrade signal integrity at the verified 5Mbps operating limit.
Do not enable multiple bus drivers at the same time. On a shared RS-485 network, coordinate driver-enable signals and allow adequate receiver turnaround time before interpreting returned data. Also avoid treating the 5Mbps headline rate as guaranteed over every cable length; propagation delay, reflections, grounding, and electromagnetic interference can reduce the usable margin.
Keep the supply-return path continuous and place local supply bypassing close to the transceiver supply pin. Separate the RS-485/RS-422 traces from switching nodes and high-current return paths where practical. Because the verified material does not expose the detailed pin map, confirm pin numbers and enable polarity in the official Renesas datasheet before assigning bypass capacitors or protection devices.
Slew-rate-limited operation can reduce high-frequency energy on slower or less controlled interconnects, but the exact control and transmission-delay tradeoffs are not present in the supplied snippets. Compare the manufacturer’s high-speed and limited-slew-rate curves against the required data rate and cable length. Shielding, proper cable grounding, and common-mode protection may be needed in electrically noisy installations.
Información de cumplimiento
The verified comparison data describes the ISL8485CB family as RoHS compliant. No verified information was supplied for REACH, lead-free status, halogen-free status, conflict minerals, or automotive qualification.
