ISL8489IB - 250kbps RS-485/422 Transceiver | Renesas
MPN: ISL8489IB ✓ פעילISL8489IB סקירה
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. These balanced interfaces belong to the broader wired-communication hierarchy and are commonly used where noise immunity, signal integrity, and reliable communication over longer cables are more important than single-ended signaling.
The verified product information identifies a 5 V supply, low power consumption, full-duplex operation, support for both RS-485 and RS-422, and data rates up to 250 kbps. Its 14-pin SOIC package supports conventional surface-mount PCB assembly. Because the device lacks separate RX and TX enable pins, it is particularly appropriate for designs that keep both directions of the balanced interface continuously active.
The ISL8489 family is described by the manufacturer as a BiCMOS 5 V single-transceiver solution designed for RS-485 and RS-422 balanced communication. Its low-power architecture supports equipment in which multiple interface channels may be present. High-speed or slew-rate-limited operation gives designers a choice according to cable length, topology, and signal-integrity requirements, although exact edge-rate and propagation-delay limits must be confirmed in the manufacturer datasheet.
Typical uses include industrial automation links, building-automation equipment, instrumentation, motor-control systems, and industrial data networks. The device can also support point-to-point balanced links where continuous full-duplex operation is preferred. Companion interface devices such as the SN65HVD06D, SP485ECN-L, and SN75174DWR may be relevant when designing connected RS-485 networks or comparing transceiver families.
A key design consideration is the absence of independent transmit and receive enables. PCB designers should therefore account for continuous driver activity and verify the driver state, bus termination, protection strategy, and cable topology against the system operating requirements. Decoupling, grounding, and differential-routing practices remain essential for reliable operation on externally accessible industrial buses.
This page consolidates verified distributor listings, exact interface and packaging information, sourcing data, comparison fields, and practical design guidance. Where detailed electrical limits or a verified pin mapping were not present in the supplied source data, the missing information is explicitly identified rather than estimated.
חלופות תחליף ישיר עבור ISL8489IB — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
ISL8489IA
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
ISL8489IB מפרטים
| Product Type | RS-485/RS-422 transceiver |
| Transceiver Configuration | 1 transmit / 1 receive |
| Communication Mode | Full duplex |
| מתח אספקה | 5 V |
| Maximum Data Rate | 250 kbps |
| Supported Standards | RS-485 and RS-422 |
| Driver and Receiver Enable Controls | No RX/TX enable controls |
| Logic Technology | BiCMOS |
| Power Classification | Low power |
| Signal Type | Balanced differential |
| Operating Mode Options | High speed or slew rate limited |
| מארז | 14-pin SOIC |
| סוג הרכבה | Surface mount |
מדריך תצורת פינים של ISL8489IB 14-pin soic
תצורת פינים עבור ISL8489IB (מארזת 14-pin soic). מספרי פינים, פונקציות ותרשימי חיבורים מוגדרים ב-Datasheet של היצרן. יש לעיין בו לקבלת ה-footprint המדויק והנחיות הלחמה.
אין נתוני פריסת פינים מפורטים עבור ISL8489IB.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
ISL8489IB מתאים עבור 6 יישוםs: Industrial Automation Communication, Motor Control and Feedback Network, Building Automation Equipment, Industrial Instrumentation, Point-to-Point Data Acquisition, Embedded Control and Sensor Interface.
Industrial Automation Communication
The ISL8489IB fits point-to-point industrial automation links that require balanced signaling at rates up to 250 kbps. Its 5 V full-duplex transceiver can connect a controller to a remote I/O module over an RS-485 or RS-422 cable while rejecting common-mode noise more effectively than a single-ended interface. The absence of separate RX and TX enable pins simplifies continuously active links. Engineers must still verify the operating temperature, protection rating, termination, and grounding requirements from the manufacturer datasheet.
מומלץ
Motor Control and Feedback Network
The ISL8489IB can support communication between a motor controller and a remote drive or feedback module when the required data rate is 250 kbps or lower. Full-duplex RS-422 operation is useful for dedicated command-and-response paths, while its low-power 5 V design suits compact embedded control equipment. The design should use a differential return path, suitable cable termination, and protection appropriate to the motor environment. Exact common-mode limits and surge withstand data were not present in the verified listings.
מומלץ
Building Automation Equipment
The ISL8489IB is appropriate for building-automation controllers, room modules, and field interfaces that communicate over balanced RS-485 or RS-422 wiring. Its low-power operation helps limit the energy impact of multiple installed nodes, and the 250 kbps rate is sufficient for supervisory commands and sensor-status traffic. Because the IC has no independent transmit or receive enable, it favors continuously communicating endpoints rather than shared buses requiring local bus mute capability. Verify temperature and isolation requirements for the installation environment.
מומלץ
Industrial Instrumentation
The ISL8489IB can carry measurement and control traffic between an instrument and a remote host at speeds up to 250 kbps. Balanced differential signaling helps preserve data integrity where instrument cables pass near motors, switching equipment, or other noise sources. The device’s full-duplex configuration supports simultaneous command and response traffic on dedicated pairs. Designers should confirm receiver sensitivity, propagation delay, and operating-temperature specifications in the datasheet, then select shielding, grounding, and bus termination according to the installation.
מומלץ
Point-to-Point Data Acquisition
The ISL8489IB supports dedicated RS-422 point-to-point data-acquisition links where full-duplex operation and balanced signaling are useful. Its 250 kbps maximum data rate accommodates many sensor, status, and supervisory-data channels, while low-power 5 V operation is compatible with embedded acquisition equipment. Since there are no separate receiver or transmitter enable pins, both directions operate continuously and the PCB does not require enable-control logic. Cable length, noise margin, and isolation should be validated before deployment.
מומלץ
Embedded Control and Sensor Interface
The ISL8489IB can bridge a low-voltage control circuit to an external balanced sensor network when communication rates do not exceed 250 kbps. Its low-power 5 V operation and small 14-SOIC package can simplify compact industrial or embedded controller layouts. The lack of RX/TX enables makes the interface straightforward for always-on communication, but the driver remains active during normal operation. Board planners should preserve differential trace symmetry, provide local supply bypassing, and consult the official pinout before routing the 14-pin footprint.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ISL8489IB — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ISL8489IA |
|---|---|---|
| Package | 14-SOIC | 14-SOIC - same package family |
| Brand | Renesas Electronics | Renesas Electronics |
| Product Type | RS-485/RS-422 transceiver | RS-485/RS-422 transceiver |
| Transceiver Configuration | 1 transmit / 1 receive | 1 transmit / 1 receive |
| Supply Voltage | 5 V | 5 V |
| Maximum Data Rate | 250 kbps | 250 kbps |
| Communication Mode | Full duplex | Full duplex |
| RX/TX Enable Controls | No | No |
| Logic Technology | BiCMOS | BiCMOS |
| Verified Unit Price as of 2026-10-30 | $0.8471 starting price | Unavailable |
מבדילים עיקריים
- Compact full-duplex balanced interface (לעומתISL8489IA)
- Simple continuously enabled interface (לעומתISL8489IA)
- Low-power 5 V operation (לעומתISL8489IA)
הערות תכנון
Route the RS-485/RS-422 differential pair as a closely coupled pair over a continuous ground reference, avoiding splits in the plane beneath the traces. Keep the transceiver close to the connector and protection network, minimize stub branches, and use the same routing geometry for both conductors. Because the ISL8489IB supports only 250 kbps and may be used in slew-rate-limited mode, the final edge rate and cable length should be checked against the manufacturer recommendations.
Do not substitute a generic 8-pin RS-485 device for this 14-pin SOIC footprint. The ISL8489IB has one transmitter and one receiver but no independent RX or TX enable controls; many modern transceivers use those enables for shutdown or bus isolation. Confirm the official pin names, supply pins, ground pins, driver outputs, receiver inputs, and logic reference before releasing a replacement schematic or PCB.
Place the 5 V decoupling capacitor immediately beside the transceiver’s supply and ground pins, following the value and layout specified in the manufacturer datasheet. Keep switching-converter return currents and high-current motor paths away from the interface ground reference. If the cable leaves the enclosure, use appropriate surge and ESD protection ahead of the transceiver; the verified source set does not establish the ISL8489IB’s protection rating, so it must not be assumed.
Select termination only after determining the cable topology and whether the ISL8489IB is used for RS-422 point-to-point links or multidrop RS-485 networks. The absence of enable pins means the driver cannot be locally muted with an enable signal, which can complicate shared-bus arrangements. Verify node count, cable length, grounding method, and fault behavior in the system design rather than adding termination indiscriminately.
מידע על תאימות
The verified distributor and datasheet-index listings did not explicitly provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These statuses remain unknown rather than being inferred.