MAX3243CPW - 3-5.5V 250kbps RS-232 Transceiver | Texas Instruments
N.º de pieza: MAX3243CPW ✓ ActivoMAX3243CPW Descripción general
An RS-232 transceiver is an interface IC that converts logic-level signals into RS-232 line levels and converts received RS-232 signals back into digital logic levels. Within the interface hierarchy, the MAX3243CPW combines a line driver, line receiver, and charge-pump-assisted level-shifting functions. Its three-driver, five-receiver arrangement is particularly useful for DE-9-style data terminal equipment interfaces that need more receiver channels than transmitter channels.
The MAX3243 offers flexible power features that can reduce consumption automatically, helping equipment designers limit power use when communication activity is low. Two always-enabled outputs, ROUT2B and INVALID, support checking a ring indicator and determining whether received RS-232 data is valid. The 3 V to 5.5 V operating range allows the same interface circuit to operate from either 3.3 V or 5 V system rails.
Operation at up to 250 kbps makes the device suitable for moderate-speed serial data links rather than only slow legacy port traffic. Its ±15 kV HBM ESD protection adds system-level ruggedness at externally accessible RS-232 connectors, where cables and user equipment can introduce electrostatic discharge. Protection ratings should still be complemented by appropriate board-level grounding and cable-routing practices.
Typical uses include industrial serial consoles, data acquisition equipment, test and measurement instruments, embedded control systems, and legacy peripheral interfaces. The five receivers are useful when a system must monitor several RS-232 inputs, such as modem-control, status, ring, and data signals, while three drivers can handle transmit and control lines.
PCB design should reserve the 28-pin TSSOP footprint, connect all supply and ground pins as directed by the manufacturer, place charge-pump capacitors close to their associated pins, and route RS-232 connector traces away from sensitive logic. Confirm signal direction, receiver enable, shutdown, and always-enabled output behavior against the manufacturer pin description before finalizing the schematic.
This product guide consolidates the principal electrical ratings, package information, interface use cases, verified cross-references, and practical layout considerations into an engineer-focused reference for selecting and implementing the MAX3243CPW.
Alternativas directas para MAX3243CPW — 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 MAX3243CPW (mismo factor de forma y huella) — difiere en ESD Protection, Number of Drivers, Number of Receivers, Supply Voltage Range.
MAX3243CUI+
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Ver hoja de datos →MAX3243CPW Especificaciones
| Product Type | Multichannel RS-232 line driver and receiver |
| Supply Voltage Range | 3 V to 5.5 V |
| Maximum Data Rate | 250 kbps |
| Number of Drivers | 3 |
| Number of Receivers | 5 |
| ESD Protection | ±15 kV HBM |
| Protected Connections | Serial-port connection pins, including GND |
| Package Type | 28-pin TSSOP |
| Tipo de montaje | Surface mount |
| Shutdown Control | Automatic power-saving feature |
| Always-Enabled Outputs | ROUT2B and INVALID |
| Driver Output Type | RS-232 line driver |
| Receiver Output Type | RS-232 line receiver |
Guía de configuración de pines de MAX3243CPW 28-pin tssop
Configuración de pines para MAX3243CPW (encapsulado 28-pin tssop). 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 MAX3243CPW.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
MAX3243CPW es adecuado para 6 aplicacións: DE-9 Serial Console Interface, Industrial Data Acquisition, Test and Measurement Equipment, Embedded Controller Communication, Legacy Peripheral Connectivity, Security and Access-Control Terminals.
DE-9 Serial Console Interface
The MAX3243CPW fits a DE-9-style console because it combines three RS-232 drivers with five receivers, allowing data, status, ring, and control signals to be monitored through one interface IC. It operates from 3 V to 5.5 V at up to 250 kbps, so a single design can cover both 3.3 V and 5 V embedded platforms. The five receiver channels provide more observation points than the three transmit channels, while ROUT2B and INVALID remain available for ring and validity checks. Place the charge-pump capacitors and interface bypass capacitors close to the device, and route connector-side traces away from sensitive digital circuitry.
Recomendado
Industrial Data Acquisition
The MAX3243CPW is useful in industrial data-acquisition equipment that receives commands and reports equipment status over an RS-232 link. Its three drivers support outbound data and selected control signals, while five receivers can monitor several independently arriving lines. The 250 kbps rate is appropriate for configuration transfers, status polling, and moderate-rate telemetry rather than continuous high-bandwidth streaming. Its 3 V to 5.5 V supply range simplifies adaptation between 3.3 V controllers and legacy 5 V peripherals. The ±15 kV HBM rating adds protection at an externally accessible connector, although industrial enclosure grounding and signal isolation should be assessed separately.
Recomendado
Test and Measurement Equipment
Instrumentation systems commonly use RS-232 for legacy printer, calibrator, and service-port connections, making the MAX3243CPW a practical multi-channel interface device. Five receivers can monitor data and control inputs from an instrument, while three drivers provide outbound command or status paths. The maximum 250 kbps rate supports short control exchanges and moderate serial transfers. Because test equipment often connects to user-supplied cables, the device's ±15 kV HBM protection is especially relevant. Use the manufacturer pin and capacitor guidance, provide a stable reference ground, and place protection or isolation ahead of the IC when the external environment exceeds the device's operating limits.
Recomendado
Embedded Controller Communication
The MAX3243CPW connects a microcontroller or processor to legacy RS-232 equipment while operating from a 3.3 V or 5 V rail. Its 250 kbps maximum rate accommodates many command protocols, boot-loader messages, and configuration exchanges. The five-receiver configuration allows the controller to inspect modem-control, carrier, ring, and other status lines without requiring multiple interface packages. Always-enabled ROUT2B and INVALID outputs can be read by a general-purpose input pin for ring and data-validity detection. Designers should confirm logic compatibility at the receiver outputs and observe the required charge-pump capacitor layout to prevent unintended signal or supply noise.
Recomendado
Legacy Peripheral Connectivity
The MAX3243CPW provides a practical bridge between modern electronics and legacy RS-232 peripherals that retain DE-9-style connectors. It can drive three outbound lines and monitor five inbound lines, enabling control and status functions as well as data transfer. Its 3 V to 5.5 V operation supports integration into both legacy 5 V equipment and newer 3.3 V systems. The 250 kbps limit supports legacy peripheral traffic while exceeding the throughput needed for many command-and-control protocols. Protect the connector-side interface appropriately, keep ground return paths short, and verify whether the connected equipment uses hardware handshaking before assigning all available receiver inputs.
Recomendado
Security and Access-Control Terminals
Access-control terminals and security equipment can use the MAX3243CPW to maintain a wired RS-232 service or supervisory channel to a remote controller. Three drivers can carry configuration, command, or acknowledgment traffic, while five receivers provide access to status and handshake inputs. The 250 kbps data rate is suitable for supervisory events and short configuration transactions. Its ±15 kV HBM protection is useful where service cables connect to external equipment, though enclosure design and cable routing remain central to electrostatic-discharge control. Use a defined ground strategy, avoid routing connector traces beneath sensitive processor areas, and validate the logic levels of ROUT2B and INVALID in the target firmware.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX3243CPW — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX3243CUI+ |
|---|---|---|
| Package | TSSOP-28 | TSSOP-28 |
| Brand | Texas Instruments | Texas Instruments |
| Supply Voltage Range | 3 V to 5.5 V | 3 V to 5.5 V |
| Maximum Data Rate | 250 kbps | 250 kbps |
| Automatic Power Features | Supported | AutoShutdown |
Diferenciadores clave
- Five receivers support more RS-232 input monitoring than a typical dual-channel interface (frente a MAX3243CUI+)
- Wide compatibility with modern and legacy supply rails (frente a MAX3243CUI+)
- Continuous status visibility through always-enabled outputs (frente a MAX3243CUI+)
- ESD protection is specified at externally relevant connection pins (frente a MAX3243CUI+)
Notas de diseño
Place the charge-pump and bypass capacitors at the pins identified in the manufacturer datasheet, using the shortest practical traces. The MAX3243's internal charge pump creates the RS-232 voltage levels, so long capacitor connections can increase timing variation and radiated noise. Use a footprint and pin numbering that match the 28-pin TSSOP package exactly, and verify every receiver input and driver output direction in the schematic review.
Do not assign receiver inputs or driver outputs from connector labels alone. A DE-9 connector can expose data, modem-control, status, and ring signals with different directions at the DTE and DCE ends. Build the signal map from the MAX3243CPW pin description, the connected equipment documentation, and the intended DTE or DCE role. The ROUT2B and INVALID outputs remain enabled, but their usefulness still depends on correct receiver routing.
Route connector-side RS-232 traces away from clock, ADC, and sensitive control paths, and maintain a continuous return-ground path. The ±15 kV HBM component rating helps at the IC pins but does not guarantee immunity at the connector or enclosure entry point. Use appropriately rated grounding and protection measures at exposed connectors, especially when long cables connect the equipment to uncontrolled external hardware.
Provide the 3 V to 5.5 V supply within the limits stated by the manufacturer and decouple the device close to its supply pins. Because the device can enter automatic power-saving modes when communication activity is absent, verify that the selected mode does not delay receiver detection, ringing indication, or required periodic handshakes. Use the always-enabled ROUT2B and INVALID outputs when the host must observe status continuously.
Información de cumplimiento
The identified technical information confirms ±15 kV HBM ESD protection but does not state the regulatory compliance status of the MAX3243CPW ordering code.
