MC1489MG - Quad EIA-232D Receiver | onsemi | 14-SOIC
Référence : MC1489MG ✓ ActifMC1489MG Présentation
An EIA-232 line receiver is an interface IC that converts bipolar RS-232 voltage levels into digital logic levels. It belongs to the line-receiver class within interface ICs, a larger functional group that also includes RS-232 drivers, transceivers, and multi-protocol interface devices. Unlike a transceiver, the MC1489MG performs reception only, allowing equipment with separate transmit and receive signal paths to use a dedicated receiver for each direction.
The four-channel architecture reduces the component count in equipment that exchanges multiple serial signals. Each receiver has a response-control function, which permits a resistor or a resistor and bias-voltage source to influence receiver behavior. Input resistance of 3.0 kΩ to 7.0 kΩ provides the required input loading for EIA-232D interfaces, while the ±30 V input signal range supports the voltage excursions characteristic of RS-232 signaling.
The MC1489MG is based on a monolithic low-power Schottky receiver design. This implementation supports four independent receive channels without requiring a separate receiver package for every signal. Because the part contains receivers rather than transmitters, it cannot independently generate the RS-232 voltage swings required to drive a remote communication port; it must be paired with an appropriate line driver when a design needs both transmission and reception.
Typical uses include industrial serial interfaces, data-terminal equipment, data-communication equipment, remote-control links, and legacy RS-232 ports. The device is particularly relevant when an existing design requires four receive channels in a single 14-pin surface-mount package. Its commercial extended temperature designation also makes it a candidate for equipment operating outside the usual consumer temperature range.
PCB design should preserve the EIA-232 input network, provide a stable supply and ground reference, and route each receiver input away from fast switching or high-current paths. The response-control terminals should be left at the configuration shown in the manufacturer application guidance. Review the pin-description table and operating limits in the manufacturer datasheet before finalizing the footprint and external networks.
Alternatives de remplacement direct pour MC1489MG — 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 alternativesMC1489MG Spécifications
| Receiver Type | Quad line receiver |
| Number of Receiver Channels | 4 channels |
| Interface Standard | EIA-232D |
| Input Resistance | 3.0 kΩ to 7.0 kΩ |
| Input Signal Range | ±30 V |
| Response Control | Separate response-control terminal for each receiver |
| Temperature Grade | Commercial extended |
| Package Code | SOP |
| Package Type | 14-pin SOIC, gull wing |
| Terminal Count | 14 terminals |
| Type de montage | Surface mount |
Guide de configuration des broches du MC1489MG 14-pin soic, gull wing
Configuration des broches du MC1489MG (boîtier 14-pin soic, gull wing). 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 MC1489MG.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MC1489MG convient pour 6 applications: Legacy RS-232 Equipment Interfaces, Industrial Data-Terminal Equipment, Multi-Channel Remote Control Interfaces, Data-Communication Equipment, Serial Port Expansion, Instrumentation and Measurement Equipment.
Legacy RS-232 Equipment Interfaces
The MC1489MG fits the receive side of legacy serial equipment where several EIA-232D signals must be converted into logic-level inputs. Its four independent receiver channels can reduce the number of packages needed on a controller board, while the documented 3.0 kΩ to 7.0 kΩ input resistance supports the interface loading requirements. The ±30 V input range covers the voltage excursions expected on the line. Because the MC1489MG does not include transmit drivers, a separate line-driver device is required when the board also sends RS-232 data.
Industrial Data-Terminal Equipment
Data-terminal equipment can use the MC1489MG to accept up to four RS-232 signals from a communications device. The commercial extended temperature grade makes the receiver appropriate for equipment designed for a wider operating environment than a typical consumer product. The board designer should apply the manufacturer input network to every channel and verify that the four receiver outputs remain compatible with the downstream logic family. A separate transmitter remains necessary for bidirectional serial links.
Multi-Channel Remote Control Interfaces
A remote-control or supervisory system with several incoming command lines can use the MC1489MG for a consolidated four-channel receiver. Consolidating the receivers simplifies routing compared with four separate packages, while individual response-control terminals retain flexibility for each input path. The design must ensure that unused channels are handled according to the manufacturer guidance rather than left as floating inputs, and the ±30 V input range must be considered when defining protection and grounding.
Data-Communication Equipment
The MC1489MG was designed for data-communication equipment that interfaces with data-terminal equipment through EIA-232D signaling. It handles reception only, making it appropriate for a communication unit with distinct inbound and outbound channels. Using one four-channel receiver package simplifies the inbound signal section, but the outbound path still requires a suitable EIA-232 line driver. PCB placement should keep the high-voltage receive inputs away from sensitive logic to reduce coupling and ground-noise concerns.
Serial Port Expansion
When a system already has an RS-232 transmitter and needs additional receive inputs, the MC1489MG can expand the receiving side without changing the established transmit architecture. Its four channels provide a compact way to bring remote status or control signals into the host controller. The designer should compare the receiver logic output levels with the controller input thresholds and configure each response-control network as documented. This arrangement is especially useful for legacy equipment retaining only a receive connector or limited control inputs.
Instrumentation and Measurement Equipment
Measurement instruments and industrial controllers often combine slow control commands with RS-232 diagnostic links. The MC1489MG can receive the RS-232 side while other circuitry handles measurement functions and an external driver handles transmission. Its four-channel organization allows separate instrument-control, status, alarm, and service signals to share a receiver package. Place the receive network close to the connector, provide a stable common ground, and keep the MC1489MG supply return electrically coherent with the rest of the analog and digital circuitry.
Données de référence d'ingénierie pour MC1489MG — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit |
|---|---|
| Receiver Type | Quad line receiver |
| Number of Channels | 4 |
| Interface Standard | EIA-232D |
| Input Resistance | 3.0 kΩ to 7.0 kΩ |
| Input Signal Range | ±30 V |
| Response Control | Separate terminal for each receiver |
| Package | 14-pin SOIC, gull wing |
| Brand | onsemi |
| Temperature Grade | Commercial extended |
Principaux différenciateurs
- Four independent receiver channels in one package (vs MC1489N)
- Wide EIA-232 receive input range (vs 74AHCT125S14-13)
- Per-receiver response-control access (vs SN75189NSR)
Notes de conception
Route each EIA-232 receive input directly toward its associated receiver pin and place the documented input-network components near the connector or protection device. Keep these traces away from clocks, switching-regulator nodes, relay contacts, and high-current return paths. Although the receiver accepts signals up to ±30 V, correct routing limits capacitive coupling and helps preserve reliable interpretation of slow or noisy serial data.
Do not treat MC1489MG as a complete RS-232 port because it contains no line-driver outputs. Pair the receiver with a suitable EIA-232 driver when the design must transmit. Also avoid assuming that MC1489-family devices with different package codes are drop-in substitutes: the MG suffix denotes the 14-pin SOIC configuration, so the PCB land pattern and assembly process must be checked before replacement.
Use the manufacturer pin-description table to assign every output, response-control terminal, supply, and ground connection. The response-control networks influence each channel independently, so changing one receiver's control arrangement can unintentionally alter its behavior. Confirm that unused inputs and control terminals are connected exactly as required by the datasheet rather than allowing high-impedance nodes to float.
Verify the logic-level interface between each receiver output and the following digital device. The MC1489MG converts an EIA-232D input into a logic-level output, but the destination device must still recognize that voltage and signal polarity. Validate direction, inversion, and logic thresholds in the complete interface rather than treating the receiver output as a direct continuation of the RS-232 waveform.
Informations de conformité
No explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals statements were identified for MC1489MG. AEC-Q100 is not applicable because this is an interface receiver rather than an automotive-qualified device.
