MC1489AD - Quad EIA-232D Receiver IC | onsemi
N.º de pieza: MC1489AD ✓ ActivoMC1489AD Descripción general
An EIA-232D line receiver is a type of interface IC that converts bipolar serial data from a communications port into a digital logic signal for a host, peripheral, or data-processing system. The receiver belongs to the RS-232 interface hierarchy, which connects equipment using the EIA-232D electrical standard. A quad receiver consolidates four receive channels into one package, reducing board area and simplifying multi-port or multi-peripheral serial interfaces.
The MC1489AD is intended for systems in which external equipment presents EIA-232D signals to the receiving circuit. Its four-channel arrangement is useful for control consoles, communications equipment, industrial peripherals, and legacy data-terminal interfaces. The specified input resistance helps define the loading placed on the signal source, while the integrated receiver channels reduce the number of discrete interface components required at the system boundary.
Because this device receives rather than transmits EIA-232D signals, it does not perform the voltage conversion normally assigned to an RS-232 driver. Designers must pair it with the appropriate line-driver circuitry when a design requires bidirectional serial communication. Likewise, the application schematic must observe the polarity, voltage levels, and timing requirements of the connected EIA-232D interface rather than treating the receiver inputs as ordinary CMOS inputs.
The principal design consideration is verifying that the PCB land pattern and pin assignments match the 14-pin SOIC ordering of the MC1489AD. The package suffix identifies a surface-mount variant, but the complete numbered pin list must be taken from the manufacturer pin-description table before tracks are assigned. Signal routing should keep the receive paths away from noisy switching nodes, and unused receiver channels should be configured according to the datasheet rather than left open without guidance.
Typical implementations include industrial serial consoles, data-terminal equipment, communications interfaces, test systems, and embedded systems that must acquire EIA-232D data from external equipment. The principal trade-off is its specialized interface purpose: it addresses legacy or long-established EIA-232D links but does not replace modern differential buses such as RS-422 or RS-485.
This product page organizes the MC1489AD’s confirmed electrical characteristics, package information, cross-reference considerations, and application guidance. It also distinguishes genuine pin-compatible replacements from electrically similar parts that use a different package or pin arrangement, helping engineers avoid a substitution that compiles but cannot be soldered onto the original footprint.
Alternativas directas para MC1489AD — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MC1489AD (mismo factor de forma y huella) — difiere en Package, Receiver Configuration, Input Resistance, Interface Standard, Mounting Type.
MC1489AD-T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC1489AD Especificaciones
| Receiver Configuration | 4 independent receivers |
| Interface Standard | EIA-232D |
| Product Type | Quad line receiver |
| Input Resistance | 3.0 kΩ to 7.0 kΩ |
| Number of Receive Channels | 4 channels |
| Encapsulado | 14-pin SOIC |
| Tipo de montaje | Surface mount |
Guía de configuración de pines de MC1489AD 14-pin soic
Configuración de pines para MC1489AD (encapsulado 14-pin soic). 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 MC1489AD.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
MC1489AD es adecuado para 6 aplicacións: Industrial Serial Control Interface, Legacy Data Terminal Equipment, Data Communications Equipment Interface, Instrumentation and Test Systems, Remote Monitoring Terminal, Multi-Peripheral Embedded System.
Industrial Serial Control Interface
The MC1489AD fits industrial equipment that receives commands or status data through an EIA-232D connection. Its four receiver channels allow one compact 14-pin SOIC to handle several incoming serial signals while the associated transmitter circuitry drives outbound data. The documented 3.0 kΩ to 7.0 kΩ input resistance defines how the receiver loads the EIA-232D source, while the quad arrangement reduces the number of discrete receiver packages on the controller board.
Recomendado
Legacy Data Terminal Equipment
The MC1489AD is appropriate for data terminal equipment that must acquire serial information from a legacy EIA-232D port. Its monolithic quad-receiver arrangement supports four incoming channels in one 14-pin SOIC, which is useful where front-panel status, control acknowledgment, and diagnostic data are presented by separate serial lines. The receiver should be paired with a suitable line driver when the board also requires EIA-232D transmission, and all unused channels should follow the datasheet configuration guidance.
Recomendado
Data Communications Equipment Interface
The MC1489AD can serve as the receiving boundary between data communications equipment and a digital controller. The device is specifically described for EIA-232D data terminal equipment and data communications equipment interfaces, and its four channels support parallel reception of several serial inputs. With an input resistance specified from 3.0 kΩ to 7.0 kΩ, the part provides a defined source load. Board implementation should preserve signal polarity and provide the supply and bypass conditions required by the onsemi datasheet.
Recomendado
Instrumentation and Test Systems
MC1489AD is suitable for laboratory instruments that receive control commands or measurement records over EIA-232D. Four integrated receivers in a 14-pin SOIC allow a multi-channel instrument architecture to be implemented without four separate receiver packages. The 3.0 kΩ to 7.0 kΩ input resistance provides a defined loading value for the connected interface, and the surface-mount package supports compact front-end boards. Use the manufacturer pin table to implement channel routing and confirm that unused receiver outputs meet the required logic state.
Recomendado
Remote Monitoring Terminal
The MC1489AD can receive remote-monitoring commands and status reports in equipment built around an EIA-232D management link. Its four receiver channels allow separate alarm, acknowledgment, configuration, and diagnostic signals to enter the terminal controller when the remote equipment provides compatible outputs. The device’s monolithic implementation and 14-pin SOIC outline conserve board space compared with four single-channel packages. Engineers should still verify voltage margins, signal polarity, and timing against the equipment’s EIA-232D implementation.
Recomendado
Multi-Peripheral Embedded System
The MC1489AD is appropriate for embedded controllers that communicate with several EIA-232D peripherals through separate receive paths. Four receivers in one 14-pin SOIC simplify routing compared with discrete single-channel devices, while the specified 3.0 kΩ to 7.0 kΩ input resistance defines the loading presented by each channel. The device does not replace a line driver, so bidirectional ports require the appropriate transmitter alongside the MC1489AD. Firmware and hardware should be designed around the exact receiver polarity and pin functions shown in the datasheet.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC1489AD — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | |||
|---|---|---|---|---|
| Brand | onsemi | |||
| Package | 14-pin SOIC | |||
| Receiver Configuration | Quad receiver | |||
| Interface Standard | EIA-232D | |||
| Number of Receive Channels | 4 channels | |||
| Input Resistance | 3.0 kΩ to 7.0 kΩ | |||
| Mounting Type | Surface mount | |||
| Cross-Reference Candidates | MC1489AD | Performance described as identical; package compatibility not established | Package compatibility not established | Related four-channel receiver; 14-pin footprint not established |
Diferenciadores clave
- Four EIA-232D receiving channels in one package (frente a SN75189ADR)
- Confirmed surface-mount package for the target design (frente a MC1489AP)
- Documented receiver input-resistance range (frente a TI MC1489)
Notas de diseño
Treat the MC1489AD as a 14-pin SOIC and assign tracks only after cross-checking every physical pin against the manufacturer pin-description table. The published part description confirms the package outline but does not expose the complete pin map in the product listing. Confirm whether the land pattern, pin-1 orientation, and exposed or non-exposed pad arrangement match the selected ordering code before releasing Gerber files.
Route each EIA-232D receive path directly to its assigned MC1489AD input and keep the path away from switching nodes, high-current edges, and unrelated clock signals. The receiver input resistance is 3.0 kΩ to 7.0 kΩ, so source loading and signal integrity must be evaluated with the actual external driver and cable. Preserve the specified EIA-232D polarity at the connector and avoid introducing level-shifting logic before the receiver input.
Do not approve MC1489AP, MC1489N, SN75189ADR, or the TI MC1489 as a replacement solely because their descriptions mention related receiver functions. The published comparisons either do not establish the same package or explicitly identify a different pin-out. A drop-in decision requires an identical 14-pin SOIC land pattern, matching pin assignments, compatible supply conditions, and electrical performance adequate for the installed EIA-232D interface.
Plan the receiver section around the four independent channels and verify unused-channel states in the manufacturer documentation before finalizing the schematic. Keep the EIA-232D connector, protection elements, and receive inputs in a clear signal path, while separating them from switching power stages. If the board also transmits, use a separate line-driver circuit rather than expecting the MC1489AD receiver to perform the voltage-conversion role of an RS-232 driver.
Información de cumplimiento
No explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations were identified for MC1489AD. AEC-Q100 qualification is not applicable to this general-purpose interface IC unless a separate qualified ordering variant is specified.