ISL8489IP - 5V 250kbps Full-Duplex RS-485/422 | Renesas
Référence : ISL8489IP ✓ ActifISL8489IP Présentation
An RS-485/RS-422 transceiver is an interface IC that converts logic-level signals into balanced differential transmissions and converts received differential signals back into logic levels. RS-485 supports multipoint bus communication over long cable runs, while RS-422 commonly supports point-to-point and one-driver topologies. A full-duplex transceiver provides separate paths for transmitting and receiving, unlike half-duplex designs that share a bus and require direction-control logic. The ISL8489IP therefore fits designs that need simultaneous bidirectional communication without sharing a physical signal pair.
Key verified features include a 5 V supply requirement, a maximum signaling rate of 250 kbps, full-duplex operation, support for both RS-485 and RS-422, low-power operation, and a slew-rate-limited operating option. The 14-pin PDIP package also provides through-hole compatibility for equipment requiring sockets, prototyping, or manually assembled industrial control boards. The indexed descriptions do not specify separate receiver-enable or transmitter-enable controls, indicating that this version is intended for continuous full-duplex operation.
The transceiver architecture provides differential signaling, which is valuable in environments containing industrial machinery, switching supplies, and long interconnects. Differential voltage is measured between the two conductors of a pair rather than relative to ground, improving noise immunity on the receive side. The 250 kbps rate is appropriate for low-to-moderate-speed control and monitoring links where higher signaling rates are unnecessary. The slew-rate-limited behavior can help reduce edge-related ringing and electromagnetic interference when implemented with a correctly terminated network.
Typical applications include industrial sensor and actuator networks, factory equipment links, building-control interfaces, laboratory instrumentation, point-to-point data links, and RS-422-compatible control systems. In these systems, the transceiver can connect a UART or microcontroller serial port to a balanced bus. Designers should still verify cable length, topology, grounding, termination, and logic-level compatibility against the complete system requirements before production release.
A key design consideration is that the 14-pin PDIP package is not as compact as a surface-mount transceiver. It nevertheless simplifies through-hole construction and socket-based maintenance. The principal engineering trade-off is between 250 kbps operation, low power, full-duplex behavior, and the practical size and assembly requirements of a 14-pin through-hole package.
This page consolidates the verified distributor and manufacturer-datasheet indexing information for the ISL8489IP with product-specific engineering guidance, specification gaps, and a transparent replacement assessment. It does not infer unseen electrical limits or substitute candidates whose pin compatibility has not been demonstrated.
Alternatives de remplacement direct pour ISL8489IP — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesISL8489IP Spécifications
| Product Type | RS-485/RS-422 transceiver |
| Tension d'alimentation | 5 V |
| Maximum Data Rate | 250 kbps |
| Duplex Mode | Full duplex |
| Supported Standards | RS-422 and RS-485 |
| Transceivers per Package | 1 |
| Drivers per Package | 1 |
| Receivers per Package | 1 |
| Signal Edge Control | Slew rate limited |
| Power Classification | Low power |
| Boîtier | 14-pin PDIP |
| Type de montage | Through-hole |
Guide de configuration des broches du ISL8489IP 14-pin pdip
Configuration des broches du ISL8489IP (boîtier 14-pin pdip). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour ISL8489IP.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ISL8489IP convient pour 6 applications: Industrial Sensor and Actuator Networks, Factory Equipment Communications, Point-to-Point RS-422 Data Links, Building and HVAC Control Networks, Laboratory and Test Instrumentation, Embedded Data-Acquisition Equipment.
Industrial Sensor and Actuator Networks
The ISL8489IP is appropriate for an industrial sensor or actuator network requiring one full-duplex RS-485/RS-422 link at up to 250 kbps. Its 5 V transceiver architecture connects a host UART or controller to balanced field wiring while providing differential signaling that is more resistant to common-mode noise than a single-ended interface. The slew-rate-limited configuration can also reduce edge-related ringing when the bus uses appropriate termination. The 14-pin PDIP package is convenient for through-hole control boards and prototypes, although cable length, grounding, topology, and transient protection must be established for the installation.
Factory Equipment Communications
The ISL8489IP can serve as the balanced communications interface between factory equipment and a controller operating at 250 kbps or less. Full duplex allows the transmit and receive paths to remain active independently, which is useful for equipment that exchanges commands and status data concurrently. Its RS-485/RS-422 capability supports differential cabling in electrically noisy environments, while the 14-pin PDIP construction simplifies socketed or manually assembled industrial electronics. Engineers should add the isolation, surge protection, grounding, and termination required by the site rather than assuming the transceiver alone provides industrial ruggedness.
Point-to-Point RS-422 Data Links
For a point-to-point RS-422 link, the ISL8489IP provides a 5 V full-duplex differential interface capable of operation at 250 kbps. Separate differential transmit and receive pairs allow two devices to communicate simultaneously without a shared half-duplex direction-control path. This arrangement can simplify software flow control when both endpoints exchange information regularly. Because the device is slew-rate limited, system designers should verify edge rate, cable length, receiver bandwidth, and termination against their installed wiring rather than equating maximum data rate with maximum physical cable distance.
Building and HVAC Control Networks
The ISL8489IP fits low-speed building-control or HVAC equipment links that use balanced RS-485 or RS-422 signaling at 250 kbps or below. The full-duplex arrangement supports simultaneous command transmission and status reporting, while differential signaling improves noise tolerance in buildings containing variable-speed drives and switching equipment. Its 14-pin PDIP package is useful for control boards that favor through-hole assembly and service sockets. Confirm logic thresholds, bus loading, common-mode range, cable routing, and protective-device requirements because those operating limits are not fully available in the supplied verified excerpts.
Laboratory and Test Instrumentation
The ISL8489IP can provide a balanced laboratory or test-instrumentation link between a controller and peripheral equipment operating at up to 250 kbps. Full-duplex communication helps minimize procedural delays when a system must send commands while receiving measurements. The slew-rate-limited driver behavior may assist in controlling edge energy on appropriately terminated interconnects, while the 14-pin PDIP package facilitates breadboard, socket, and through-hole prototype construction. Instrument designers should still account for grounding loops, isolated test environments, cable length, and external surge or ESD protection.
Embedded Data-Acquisition Equipment
The ISL8489IP is suitable for embedded data-acquisition equipment that must aggregate or distribute information over a balanced RS-485 or RS-422 network at 250 kbps. One integrated transceiver provides both transmit and receive functions without requiring a separate half-duplex direction-control arrangement. Its 5 V operating supply suits many embedded control boards, and the 14-pin PDIP package is practical where component density is secondary to straightforward through-hole assembly. The design must still validate bus topology, node count, termination, isolated grounding, and environmental protection against the exact acquisition-site requirements.
Données de référence d'ingénierie pour ISL8489IP — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit |
|---|---|
| Brand | Renesas Electronics |
| Package | 14-pin PDIP |
| Product Type | RS-485/RS-422 transceiver |
| Supply Voltage | 5 V |
| Maximum Data Rate | 250 kbps |
| Duplex Mode | Full duplex |
| Transceiver Count | 1 transceiver per package |
| Signal Edge Control | Slew rate limited |
| Mounting Type | Through-hole |
| Power Classification | Low power |
Principaux différenciateurs
- Verified 250 kbps slew-rate-limited operation (vs Generic high-speed RS-485 transceiver)
- Integrated full-duplex operation (vs Half-duplex RS-485 transceiver)
- Serviceable through-hole package (vs Surface-mount RS-485 transceiver)
- Support for both RS-485 and RS-422 (vs Single-standard interface device)
Notes de conception
Route each RS-422 and RS-485 differential pair as a tightly coupled pair with continuous ground reference, avoid stubs, and place termination only where required by the selected bus topology. The ISL8489IP is a 14-pin PDIP device, so lead spacing and drilled footprint geometry must be checked against the actual package drawing rather than inferred from the generic PDIP name. Keep connector and protection devices near the entry point and separate noisy return currents from the transceiver ground reference.
Do not treat the RS-485 label as proof that every common-mode, supply, topology, or cable-length condition is satisfied. The verified excerpts establish 5 V operation, 250 kbps signaling, full-duplex operation, and slew-rate-limited behavior, but they do not provide complete electrical limits. Confirm the manufacturer datasheet for receiver thresholds, driver impedance, common-mode range, temperature limits, and absolute maximum ratings before choosing resistor values, protection components, or operating distance.
The slew-rate-limited driver behavior of ISL8489IP can reduce the severity of fast-edge ringing when the cable network is correctly terminated. It does not replace controlled board layout. Use the smallest practical stubs, maintain symmetric pair routing, reference the interface ground appropriately, and avoid placing the transceiver beside switching nodes or high-current return paths. Validate the completed system with a rise-time or common-mode measurement because the supplied data does not specify radiated-emission or immunity limits.
Place the transceiver's supply-decoupling network close to its supply and ground pins and use a local ground return that does not carry unrelated high-current loads. The indexed family description identifies the ISL8489 as a 5 V low-power device, but the supplied data does not include the numeric supply-current limit or quiescent-current curve. Confirm those values from the manufacturer datasheet, account for driver loading, and ensure the power source has adequate transient margin for the complete interface circuit.
Informations de conformité
The supplied verified data does not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is marked not applicable because the product is a general-purpose communications interface IC and no automotive qualification is stated.