MC1489M - Quad EIA-232D Receiver | onsemi | SOIC-14
Référence : MC1489M ✓ ActifMC1489M Présentation
A line receiver is an interface IC used at the receiving end of a serial communications link. The MC1489M belongs to the broader line-receiver hierarchy, which includes EIA-232D receivers, interface transceivers, and multi-channel communications interface ICs. Its four channels allow one package to support four RS-232 data inputs, reducing component count in equipment with several serial ports, control links, or diagnostic interfaces.
The principal verified features include four receiver channels, 3.0 kΩ to 7.0 kΩ input resistance, and ±30 V input signal capability. Each receiver includes a response-control terminal to which a resistor, or a resistor and bias-voltage source, can be connected. This control allows the receiving behavior to be adjusted when the interface must accommodate different signaling thresholds or system-level conditions.
The MC1489M uses Schottky-related input structures to support low-power operation while receiving high-voltage bipolar signals. This is useful in EIA-232D equipment because the transmitter side supplies positive and negative voltages relative to the logic ground. The receiver therefore must tolerate a substantially wider input range than the logic devices connected to its outputs. The four-channel arrangement also preserves separate receive paths for simultaneous or independently controlled links.
Typical uses include RS-232 data-terminal equipment, industrial serial interfaces, instrumentation links, peripheral ports, and embedded systems that receive bipolar serial data. In such equipment, the MC1489M can sit between an external RS-232 connector and TTL or CMOS logic. The logic source impedance, grounding arrangement, and response-control network must be selected so the complete interface meets the intended EIA-232D system requirements.
Designers should pay particular attention to supply grounding, receiver input protection, unused control pins, and signal routing. A solid signal-ground reference, controlled traces, and appropriate input resistors are essential because RS-232 connectors can be exposed to ESD and other transients. Pin functions and electrical limits must be confirmed against the manufacturer datasheet before layout release or substitution.
This product record combines the verified onsemi datasheet information, distributor availability references, cross-reference candidates, and engineering-oriented selection guidance. It distinguishes confirmed drop-in candidates from general functional equivalents and highlights where additional electrical or lifecycle verification is still required.
Alternatives de remplacement direct pour MC1489M — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
MC1489A
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC1489
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SN75189
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SN75189A
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
DS1489AN
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC1489M Spécifications
| Receiver Configuration | 4 independent receivers |
| Interface Standard | EIA-232D |
| Input Resistance | 3.0 kΩ to 7.0 kΩ |
| Input Signal Range | ±30 V |
| Architecture | Monolithic quad line receiver |
| Response-Control Terminals | 4 individually accessible control terminals |
| Control Configuration | Resistor or resistor with bias-voltage source |
| Number of Terminals | 14 |
| Boîtier | SOIC-14 (SOEIAJ-14) |
| Package Type | Gull-wing surface-mount SOP |
Configuration des broches de MC1489M
| Broche 1 | R1OUT — Receiver 1 output |
| Broche 2 | R1IN — Receiver 1 input |
| Broche 3 | GND — Ground reference |
| Broche 4 | R2IN — Receiver 2 input |
| Broche 5 | R2OUT — Receiver 2 output |
| Broche 6 | R2CONT — Receiver 2 response-control terminal |
| Broche 7 | R3OUT — Receiver 3 output |
| Broche 8 | R3IN — Receiver 3 input |
| Broche 9 | R3CONT — Receiver 3 response-control terminal |
| Broche 10 | R4IN — Receiver 4 input |
| Broche 11 | R4OUT — Receiver 4 output |
| Broche 12 | R4CONT — Receiver 4 response-control terminal |
| Broche 13 | VCC — Positive supply terminal |
| Broche 14 | R1CONT — Receiver 1 response-control terminal |
Applications typiques
MC1489M convient pour 6 applications: RS-232 Data-Terminal Equipment, Industrial Serial Communication, Instrumentation and Test Equipment, Embedded Peripheral Interfaces, Peripheral and Printer Port, Remote Control and Diagnostics.
RS-232 Data-Terminal Equipment
The MC1489M fits the receive side of RS-232 data-terminal equipment because four independent receiver channels can share one 14-pin SOIC package. According to the onsemi MC1489 manufacturer datasheet, each input supports a bipolar range of ±30 V and presents 3.0 kΩ to 7.0 kΩ input resistance. These characteristics allow the IC to receive signals from an external EIA-232D connector while driving logic circuitry on the board. Each receiver’s response-control terminal provides an additional design variable, allowing a resistor or resistor-and-bias arrangement to be selected for the interface. The four-channel implementation reduces package count compared with using four separate receivers, although routing must preserve a stable signal-ground reference and minimize noise coupling into sensitive logic paths.
Recommandé
Industrial Serial Communication
The MC1489M is suitable for industrial equipment that receives several EIA-232D control or data signals. Its four receive channels, ±30 V input range, and individually controlled response terminals let one IC support multiple asynchronous links without adding four separate packages. The manufacturer datasheet identifies the device as a low-power Schottky quadruple line receiver, making it relevant to interfaces that must translate external bipolar signals into internal logic levels. In an industrial design, the receiver should be placed near the connector or protection network so that long unprotected board traces do not carry the external signal farther than necessary. Supply bypassing, chassis-to-signal-ground handling, and ESD protection also require careful review because the verified excerpts do not provide complete application-specific limits.
Recommandé
Instrumentation and Test Equipment
The MC1489M can serve as the interface between legacy RS-232 equipment and TTL or CMOS control logic in instrumentation systems. Its four channels are useful when an instrument accepts multiple remote commands, status lines, or data inputs. The verified 3.0 kΩ to 7.0 kΩ input resistance provides a defined loading range, while the ±30 V signal tolerance supports the bipolar EIA-232D interface described by onsemi. A practical implementation should divide external noise and ESD exposure through appropriately selected protection components, then route the recovered signals to logic or isolation circuitry. The four response-control terminals should be configured according to the manufacturer guidance rather than left floating. Because the supplied excerpts do not state propagation delay or output thresholds, timing margin and logic compatibility must be verified before use in high-rate instrumentation links.
Recommandé
Embedded Peripheral Interfaces
The MC1489M is applicable to embedded systems that retain a host-side RS-232 port for configuration, diagnostics, or legacy peripherals. Four receive channels can handle separate status, handshake, or command inputs while occupying one 14-pin surface-mount package. Its verified ±30 V receiver range is appropriate for the EIA-232D side of the interface, whereas the downstream microcontroller must remain within its own logic limits. Designers should verify output levels, supply compatibility, and propagation timing from the complete onsemi datasheet before connecting the receiver outputs directly to a processor. Placement near the connector reduces susceptibility to coupled noise, while a compact ground-return strategy helps the receiver interpret bipolar levels reliably. External series resistance or protection may also be required according to the connector exposure and system ESD requirements.
Recommandé
Peripheral and Printer Port
The MC1489M can be used in peripherals or printer interfaces where several received RS-232 signals are required but a full multi-channel transceiver would be unnecessary. Its four receiver channels provide functional density in a 14-pin SOIC package, and the response-control feature allows each channel to be adjusted with external components when required. This makes the device relevant to receive-only control ports, status ports, and legacy equipment interfaces. The implementation should include a defined signal ground, connector-side transient protection, and controlled return routing to minimize common-mode effects. Because the verified information does not provide a complete truth table, output polarity, or timing values, designers must consult the manufacturer datasheet before finalizing logic connections. Firmware should also avoid relying on marginal levels near the transition region.
Recommandé
Remote Control and Diagnostics
The MC1489M fits remote-control and diagnostic equipment that accepts four independent command or status inputs through an RS-232 interface. The quad architecture consolidates four receive paths into one package, while the verified input resistance and ±30 V range support the physical signaling conditions of EIA-232D. Response-control terminals allow the hardware designer to tune each receiver’s external network, which can be useful when several channels operate under different grounding or threshold conditions. To preserve signal quality, place the receiver close to the connector and protection components, maintain a continuous ground reference, and keep switching-power and high-current return paths away from receiver traces. Verify the actual connector, cable, and equipment-grounding arrangement because the interface standard and the specific system requirements jointly determine reliable operation.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC1489M — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC1489A | MC1489 | SN75189 | SN75189A | DS1489AN |
|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | Texas Instruments | Texas Instruments | Texas Instruments | National Semiconductor Corporation |
| Package | SOIC-14 (SOEIAJ-14) | SOIC-14 (SOEIAJ-14) | SOIC-14 (SOEIAJ-14) | SOIC-14 (SOEIAJ-14) | SOIC-14 (SOEIAJ-14) | SOIC-14 (SOEIAJ-14) |
| Receiver Channels | 4 | 4 | 4 | 4 | 4 | 4 |
| Interface Standard | EIA-232D | EIA-232D family | TIA/EIA-232-F family | TIA/EIA-232-F family | TIA/EIA-232-F family | EIA-232D family |
| Architecture | Monolithic low-power Schottky quadruple line receiver | Quadruple line receiver | Monolithic low-power Schottky quadruple line receiver | Monolithic low-power Schottky quadruple line receiver | Monolithic low-power Schottky quadruple line receiver | Quad line receiver |
Principaux différenciateurs
- Four independent receive channels in one interface package (vs SN75189)
- Explicit verified input resistance range (vs DS1489AN)
- Verified wide bipolar input signal capability (vs SN75189A)
Notes de conception
Place the MC1489M close to the RS-232 connector and any external transient-protection network. Keep the four receiver inputs away from switching nodes and high-current return paths. Maintain a continuous signal-ground reference beneath or adjacent to the routed interface region, and connect the connector ground to the circuit ground according to the system’s grounding policy. The verified ±30 V input range describes signal tolerance, not immunity from incorrect grounding or surge exposure.
Do not treat the response-control terminals as unused pins. The verified manufacturer datasheet states that a resistor, or a resistor and bias-voltage source, may be connected to each control terminal. Review the complete receiver-response table and select a network that is valid for the intended threshold and loading. Leaving these terminals improperly biased can change the receiver operating point and reduce interface reliability.
Confirm the device supply voltage, supply-current limits, and output logic levels from the full manufacturer datasheet because those values are not present in the supplied excerpts. Provide local supply decoupling and keep the return path short. If the receiver shares a board with switching converters, separate noisy return currents from the receiver ground and validate conducted and radiated noise at the connector and logic interfaces.
Informations de conformité
No verified RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification statements were included in the supplied data. AEC-Q100 is recorded as not applicable because no automotive qualification claim was provided for MC1489M.
