MAX3221CAE+ - 3 to 5.5V RS-232 Transceiver | Analog Devices
N.º de pieza: MAX3221CAE+ ✓ ActivoMAX3221CAE+ Descripción general
An RS-232 transceiver is an interface IC that combines a transmitter and receiver for communicating between a logic-level device and an RS-232 port. The transmitter converts low-voltage TTL or CMOS signals into RS-232 levels, while the receiver converts incoming RS-232 signals back into logic-compatible levels. The MAX3221 family belongs to the interface IC hierarchy and provides a practical way to bridge modern embedded systems with legacy RS-232 equipment.
The MAX3221CAE+ includes Maxim's AutoShutdown feature, allowing the on-board power supply and driver circuitry to shut down when the receiver does not detect a valid signal. According to the Analog Devices MAX3221 product page, the device operates from +3V to +5.5V and reaches a supply current of 1 µA. These characteristics are particularly valuable in battery-powered instruments where a permanently active RS-232 interface would increase standby power consumption.
The MAX3221 is a 1-driver/1-receiver 16-pin SSOP version of the 2-driver/2-receiver MAX3223. Its integrated RS-232 supply uses charge-pump circuitry to develop the voltage swing needed by the transmitter. The C designation denotes the family's capacitor configuration, while the E designation provides shutdown-control functionality. The A suffix identifies the package and temperature-related ordering configuration used in the MAX3221CAE+ ordering code.
Typical applications include battery-powered test equipment, handheld configuration tools, serial adapters, industrial instrumentation, point-of-sale equipment, and embedded systems that must communicate with a host computer through an RS-232 port. The 16-pin SSOP footprint is useful for compact designs, although engineers should verify connector protection, cable length, logic levels, and supply compatibility against the system requirements.
The principal design consideration is signal integrity. RS-232 is a single-ended, unbalanced interface, so cable routing and ground quality can materially affect noise immunity. Place the transceiver close to the interface connector, provide a low-impedance ground path, use suitable protection for exposed cables, and observe the manufacturer's recommended charge-pump capacitor values. External circuitry may also be required for hardware handshaking or for conditioning signals on long or electrically noisy cables.
This page organizes the MAX3221CAE+ specifications, application guidance, package information, and verified same-package alternatives into an engineering-focused reference. It also highlights the practical trade-offs among shutdown, supply-voltage, capacitance, and temperature variants so designers can make a replacement decision based on actual circuit requirements rather than package similarity alone.
Alternativas directas para MAX3221CAE+ — 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 MAX3221CAE+ (mismo factor de forma y huella) — difiere en Package, Supply Voltage Range, AutoShutdown Supply Current, ESD Protection, Interface Standard.
MAX3221CAE-
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX3221ECAE+T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX3221EEAE+T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX3221EUE+
✅ Sustitución directaConsulte el precio
Ver hoja de datos →ICL3221EIAZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX3221CAE+ Especificaciones
| Product Type | RS-232 transceiver |
| Transceiver Configuration | 1 transmitter and 1 receiver |
| Supply Voltage Range | +3 V to +5.5 V |
| AutoShutdown Supply Current | 1 µA |
| Encapsulado | 16-pin SSOP |
| Tipo de montaje | Surface mount |
| Number of Drivers | 1 driver |
| Number of Receivers | 1 receiver |
| Interface Standard | RS-232 |
| Estado RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
| Lead-Free Status | unknown |
Guía de configuración de pines de MAX3221CAE+ 16-pin ssop
Configuración de pines para MAX3221CAE+ (encapsulado 16-pin ssop). 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 MAX3221CAE+.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
MAX3221CAE+ es adecuado para 6 aplicacións: Battery-Powered Test Instrument, Industrial Serial Adapter, Handheld Configuration Tool, Point-of-Sale Terminal, Data Acquisition Controller, Embedded Service Console.
Battery-Powered Test Instrument
The MAX3221CAE+ fits battery-powered test instruments that communicate with a host through RS-232. Its +3 V to +5.5 V supply range supports 3.3 V and 5 V portable systems, while the 1 µA AutoShutdown supply current reduces demand when no valid receiver signal is present. Place the transceiver near the serial connector, use the manufacturer-recommended charge-pump capacitors, and confirm that the host port uses compatible logic levels and signal polarity.
Recomendado
Industrial Serial Adapter
The MAX3221CAE+ is suitable for compact industrial serial adapters that bridge a modern embedded controller to an RS-232 equipment port. Its one-driver, one-receiver arrangement provides the required bidirectional signal path, and the 16-pin SSOP package limits board area. A production design should provide a low-impedance ground connection, route the interface away from switching nodes, and determine whether external overvoltage protection is required for the connected cable.
Recomendado
Handheld Configuration Tool
The MAX3221CAE+ supports handheld configuration tools that exchange setup commands with a host computer. The +3 V operating capability aligns with many portable embedded systems, and AutoShutdown can reduce standby consumption when the RS-232 connection is inactive. Validate the receiver thresholds and driver levels against the host interface, and include a stable reference ground to avoid interpreting ground offset as data corruption.
Recomendado
Point-of-Sale Terminal
The MAX3221CAE+ can provide legacy peripheral connectivity in a point-of-sale terminal that needs one RS-232 channel. The 16-pin SSOP package supports compact PCB layouts, and the +3 V to +5.5 V range accommodates common embedded supply rails. Because RS-232 is an unbalanced interface, keep the connector ground return short, separate it from motor and switching-power currents, and confirm whether the peripheral requires hardware handshake signals.
Recomendado
Data Acquisition Controller
The MAX3221CAE+ is appropriate for a data-acquisition controller that uses a host computer for configuration or data transfer. Its single transmitter and receiver cover a standard bidirectional RS-232 link, while the low shutdown current benefits systems that spend substantial time between host commands. Check the acquisition system’s baud-rate limit, handshake requirements, and cable length against the manufacturer specifications before finalizing the interface.
Recomendado
Embedded Service Console
The MAX3221CAE+ fits an embedded service console used for firmware loading, diagnostics, and field-service access. The 16-pin SSOP footprint leaves space for the rest of the controller, and the device accepts both 3.3 V and 5 V supply environments. Place the RS-232 circuitry near the connector, maintain continuous ground reference, and use the manufacturer-defined enable behavior to avoid unintended driver activity during system startup.
Recomendado
Datos de referencia de ingeniería para MAX3221CAE+ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX3221CAE- | MAX3221ECAE+T | MAX3221EEAE+T | MAX3221EUE+ | ICL3221EIAZ |
|---|---|---|---|---|---|---|
| Package | 16-SSOP | 16-SSOP | 16-SSOP | 16-SSOP | 16-SSOP | 16-SSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Intersil |
| Transceiver Configuration | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver |
| Interface Standard | RS-232 | RS-232 | RS-232 | RS-232 | RS-232 | RS-232 |
Diferenciadores clave
- Low-voltage operation with automatic power reduction (frente a ICL3221EIAZ)
- Exact C-configuration family option (frente a MAX3221EEAE+T)
- Direct manufacturer family continuity (frente a MAX3221EUE+)
Notas de diseño
Place the MAX3221CAE+ and its charge-pump capacitors close to the RS-232 connector. Keep the connector-side ground return short and connect it to a quiet ground plane, because RS-232 is an unbalanced interface and ground offset can distort valid data. Route the interface away from switching regulators, relays, motors, and high-current return paths to reduce common-mode interference.
Use the charge-pump capacitor values and layout specified in the manufacturer MAX3221 datasheet. Capacitor placement is part of the charge-pump design because incorrect values or long traces can alter startup behavior and driver performance. Confirm the system's minimum startup voltage, 3.3 V or 5 V supply tolerance, and AutoShutdown timing before finalizing the rail-selection components.
Treat the RS-232 connector as an exposed industrial interface. Determine whether the connected cable requires transient-voltage protection, series damping, or additional logic protection. Keep protection components close to the connector and outside the transceiver's normal operating signal path. Also verify whether the application requires hardware handshake signals beyond the one transmitter and one receiver provided by the MAX3221CAE+.
Do not assume that every MAX3221 order code is electrically identical. The C, E, A, U, and temperature-related suffixes can change charge-pump capacitance, enable behavior, or environmental qualification. For a replacement, compare the manufacturer pin descriptions, recommended capacitors, logic thresholds, enable polarity, and operating-temperature range rather than relying only on the shared SSOP-16 footprint.
Información de cumplimiento
The MAX3221 family is an RS-232 interface IC for industrial, commercial, and portable equipment rather than an automotive-qualified device. Specific RoHS, REACH, lead-free, and halogen-free declarations require confirmation from the applicable manufacturer product documentation.
