ISL8483IB - 250kbps Half-Duplex RS-485/RS-422 IC | Renesas
Teilenummer: ISL8483IB ✓ AktivISL8483IB Übersicht
An RS-485/RS-422 transceiver is an interface IC that converts between logic-level digital signals and differential bus voltages. RS-422 provides a driver-dominant, point-to-point signaling method, while RS-485 permits multiple drivers on a shared bus when only one node transmits at a time. The ISL8483IB combines one transmitter and one receiver in one package, supporting half-duplex communication over a common pair of differential conductors.
Key features include a 250 kbps data rate, a 5 V supply, separate Rx and Tx enables, and a low-power shutdown function. The verified distributor description also identifies a slew-rate-limited configuration option. Slew-rate control reduces the edge speed of transmitted signals, limiting high-frequency harmonics and electromagnetic interference at the expense of maximum signaling rate compared with an unrestricted high-speed driver.
The ISL8483IB uses separate active-high receiver-enable and driver-enable controls, allowing the host to place the unused side of the transceiver into a disabled state. Its bidirectional half-duplex arrangement is useful where two endpoints exchange requests and responses over a shared pair of wires. The device also supports transmitter shutdown for systems that need to reduce supply consumption when the bus is inactive.
Typical applications include industrial serial interfaces, remote monitoring equipment, data acquisition modules, building-control systems, factory automation links, and RS-485-to-TTL conversion products. The 8-pin SOIC package supports conventional surface-mount assembly. The industrial temperature grade identified by the verified distributor listing makes the device suitable for equipment operating across an extended commercial temperature range, subject to the manufacturer's specified limits.
Designers should verify the complete datasheet pinout, absolute maximum ratings, recommended external network, driver-load capability, and shutdown behavior before releasing a PCB. Cabling, termination, grounding, and transceiver-enable sequencing are as important as the nominal 250 kbps rating because unbalanced or incorrectly terminated buses can cause reflections, common-mode voltage errors, and unreliable communication.
This page combines verified distributor information, structured drop-in-family alternatives, application guidance, and design notes in a format designed to accelerate component selection, replacement planning, and hardware implementation.
Drop-in-Alternativen für ISL8483IB – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
ISL8483IBZ
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ISL8483IBZ-T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ISL8483IV
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ISL8482IV
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ISL8481IV
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ISL8483IB Technische Daten
| Product Type | 1/1 RS-485/RS-422 transceiver |
| Datenrate | 250 kbps |
| Versorgungsspannung | 5 V |
| Communication Mode | Half-duplex |
| Supported Standards | RS-485 and RS-422 |
| Transmitter Count | 1 |
| Receiver Count | 1 |
| Receiver Enable | Yes |
| Transmitter Enable | Yes |
| Shutdown Function | Yes, low-power SHDN |
| Drive Configuration | High-speed or slew-rate-limited |
| Gehäuse | 8-SOIC |
| Montageart | Surface mount |
| Terminal Count | 8 |
| Temperature Grade | Industrial |
ISL8483IB 8-soic Pinbelegungsleitfaden
Pinbelegung für ISL8483IB (8-soic-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für ISL8483IB.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
ISL8483IB ist geeignet für 6 Anwendungs: Industrial RS-485 Control Links, RS-485 to TTL Serial Interfaces, Data Acquisition and Remote Sensors, Building and Facility Automation, Point-to-Point RS-422 Equipment Links, EMI-Controlled Communication Equipment.
Industrial RS-485 Control Links
The ISL8483IB fits half-duplex industrial control and automation links operating at up to 250 kbps on a 5 V supply. Its one-transmitter, one-receiver arrangement provides a bidirectional path over a shared differential pair, while separate Rx and Tx enables allow the controller to isolate unused functions. The verified 8-SOIC package is convenient for compact surface-mounted control boards. Engineers should preserve the recommended termination and fail-safe biasing network, keep the bus enable logic mutually exclusive, and validate grounding and common-mode behavior against the longest cable and highest noise environment expected in service.
Empfohlen
RS-485 to TTL Serial Interfaces
The ISL8483IB is applicable to industrial USB, serial, and embedded interface adapters that translate a host UART's logic signals into an RS-485 or RS-422 balanced bus. A 250 kbps nominal rate supports moderate-speed command and telemetry traffic, and the low-power shutdown function can reduce consumption when the bus is not active. The separate transmitter and receiver enables simplify direction control around the host UART. Because the verified data does not include pin names, designers must use the manufacturer pinout and verify logic polarity, bus-idle state, and shutdown timing before finalizing the adapter schematic.
Empfohlen
Data Acquisition and Remote Sensors
The ISL8483IB can connect a controller or data-acquisition unit to distributed RS-485 sensors over a 250 kbps half-duplex link. Differential signaling reduces susceptibility to common-mode noise relative to single-ended communication, while the independent enables permit controlled transmit and receive intervals. The 5 V operating supply aligns with many embedded systems. In field installations, use twisted pair, proper reference grounding, protected connector routing, and verified bias resistors at one designated location. The transceiver rating alone does not determine maximum cable length; topology, baud rate, noise, and grounding remain critical to reliable operation.
Empfohlen
Building and Facility Automation
The ISL8483IB supports low-to-moderate-speed building automation networks that use half-duplex RS-485 physical layers for sensors, controllers, and equipment interfaces. Its 250 kbps rate is appropriate for supervisory command and status traffic, while the shutdown function can reduce system load during idle periods. Industrial temperature grading makes it a candidate for equipment located outside a tightly controlled enclosure, although the exact operating-temperature limits must be taken from the manufacturer datasheet. The implementation should include surge protection, isolated or carefully referenced grounds where required, and bus segmentation to prevent excessive loading.
Empfohlen
Point-to-Point RS-422 Equipment Links
The ISL8483IB can implement a point-to-point RS-422 link between two pieces of equipment when its receiver and transmitter enable controls are sequenced by the host. The same 8-SOIC transceiver supports both RS-422 and RS-485 operation, allowing a shared platform to address driver-dominant point-to-point and multidrop bus needs. At 250 kbps, usable distance still depends on cable impedance, termination, topology, and interference. Use twisted-pair wiring, terminate the long RS-422 line at the receiver, and avoid relying on the transceiver's logic-side enables as a substitute for electrical isolation.
Empfohlen
EMI-Controlled Communication Equipment
The ISL8483IB's identified slew-rate-limited option is useful when a 250 kbps balanced link must reduce fast edge harmonics in industrial or building equipment. Slower driver edges can lower radiated emissions and improve compatibility with sensitive neighboring circuitry, though they may reduce usable distance or leave less timing margin at the maximum data rate. The choice between high-speed and slew-rate-limited operation must follow the manufacturer guidance and measured board-level emissions. Keep the differential pair tightly coupled, provide a continuous ground reference where permitted, and place termination close to the receiver to limit reflections.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ISL8483IB – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ISL8483IBZ | ISL8483IBZ-T | ISL8483IV | ISL8482IV | ISL8481IV |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Product Type | 1/1 half-duplex transceiver | 1/1 half-duplex transceiver | 1/1 half-duplex transceiver | 1/1 half-duplex transceiver | 1/1 half-duplex transceiver | 1/1 half-duplex transceiver |
| Data Rate | 250 kbps | 250 kbps | 250 kbps | 250 kbps | 250 kbps | 250 kbps |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Supported Standards | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 and RS-422 | RS-485 and RS-422 |
| Receiver and Transmitter Enables | Yes | Yes | Yes | Yes | Yes | Yes |
| Low-Power Shutdown | Yes | Yes | Yes | Yes | Yes | Yes |
Wichtigste Unterscheidungsmerkmale
- Integrated half-duplex bus control (vs. ISL8483IBZ)
- Production packaging flexibility within the same family (vs. ISL8483IBZ-T)
- Direct RS-485 and RS-422 support (vs. ISL8483IPZ)
Designhinweise
Keep the differential bus traces as a tightly coupled pair and route them away from switching nodes, clocks, and high-current return paths. Place the transceiver close to the connector and place any required protection devices near the entry point. Maintain a continuous ground reference under the interface where the system architecture permits it. Because the verified search excerpts do not expose the complete pinout, verify every signal and exposed connection against the manufacturer package drawing before finalizing placement or copper routing.
Do not allow the transmitter and receiver enable controls to create an unintended bus conflict. In half-duplex operation, use deterministic firmware or hardware logic so that only one node drives the bus at a time. Also follow the manufacturer guidance for fail-safe biasing, termination, and shutdown states. A 250 kbps nominal rate does not guarantee reliable communication over an arbitrary cable length; topology, impedance, grounding, common-mode range, and electromagnetic noise must be evaluated together.
Use the identified slew-rate-limited operating option when the system requires reduced edge harmonics, but confirm that the reduced bandwidth still supports the selected baud rate and cable length. Terminate the bus at the physical ends rather than at every node, and avoid placing unnecessary termination across the pair. Validate emissions and immunity on the assembled board because connector cables, power converters, enclosure grounding, and adjacent circuitry can dominate the final EMC performance.
Compliance-Informationen
The verified distributor data identifies an industrial temperature grade but does not explicitly state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification status. The ISL8483IBZ ordering code suggests a separate lead-free suffix, but that detail must be confirmed from the manufacturer datasheet or product documentation.
