MAX3221IPW - 250kbps Single RS-232 Transceiver | Texas Instruments
N.º de pieza: MAX3221IPW ✓ ActivoMAX3221IPW Descripción general
An RS-232 transceiver is the interface between a low-voltage digital controller and a serial port using bipolar signal levels. Also called an RS-232 line driver/receiver or interface transceiver, it belongs to the interface IC hierarchy and translates controller-side logic into RS-232 levels while converting an incoming RS-232 signal back to logic. The MAX3221 supports one communications direction, making it suitable for point-to-point serial links, control consoles, industrial equipment, and embedded systems.
Key features include operation from a 3 V to 5.5 V supply, support for data rates up to 250 kbps, and ±15 kV ESD protection on the serial-port connection pins, including ground. The device accepts 5 V logic input while operating from a 3.3 V supply. Its dual charge-pump architecture requires only 0.1 µF external capacitors, while low standby current supports power-conscious designs.
Technically, the MAX3221 contains one line driver, one line receiver with a dedicated enable pin, and the charge-pump circuitry needed to generate positive and negative RS-232 voltage levels. According to the manufacturer datasheet, the interface meets TIA/EIA-232-F requirements and provides the electrical interface between an asynchronous communication controller and a serial-port connector. This combination allows a modern microcontroller or processor to communicate with legacy RS-232 equipment without implementing discrete level-shifting circuitry.
Typical applications include industrial automation and factory equipment, point-to-point serial adapters, test and measurement instruments, security and access-control systems, and embedded diagnostic ports. The dedicated receiver enable provides a way to place the receive path in a controlled state, while the 3.3 V-compatible supply helps simplify interfaces based on modern logic rails.
When designing a board around the MAX3221IPW, place the required charge-pump capacitors close to their corresponding pins and route the RS-232 connector interface away from sensitive analog or high-speed digital paths. External protection, grounding, and cable-routing practices remain important because the specified ±15 kV ESD rating applies to the device pins rather than to every possible system-level surge, lift, or cable event.
This product record combines verified manufacturer specifications, distributor availability information, same-footprint replacement data, and practical interface-design guidance. It is intended to help engineers identify the correct RS-232 transceiver, verify package and pin compatibility, plan decoupling, and distinguish a genuine drop-in replacement from a merely similar line-driver or receiver.
Alternativas directas para MAX3221IPW — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
MAX3221ECPWR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX3221ECPWG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX3221CPWR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SN75C3221PWR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TRS3221EIPWR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX3221IPW Especificaciones
| Product Type | Single-channel RS-232 line driver/receiver |
| Number of Drivers | 1 driver |
| Number of Receivers | 1 receiver with dedicated enable pin |
| Supply Voltage Range | 3 V to 5.5 V |
| Maximum Data Rate | 250 kbps |
| ESD Protection | ±15 kV on serial-port connection pins |
| RS-232 Compliance | TIA/EIA-232-F |
| Charge-Pump Architecture | Dual charge-pump circuit |
| External Capacitor Value | 0.1 µF |
| Logic Input Compatibility | Accepts 5 V logic input with a 3.3 V supply |
| Standby Current | 1 µA typical |
| Receiver Enable | Dedicated enable pin |
| Encapsulado | 16-pin TSSOP |
| Tipo de montaje | Surface mount |
Guía de configuración de pines de MAX3221IPW 16-pin tssop
Configuración de pines para MAX3221IPW (encapsulado 16-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 MAX3221IPW.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
MAX3221IPW es adecuado para 6 aplicacións: Industrial Automation Serial Interfaces, Embedded Point-to-Point Serial Links, Test and Measurement Equipment, Security and Access-Control Systems, Network Equipment Maintenance Ports, Portable and Battery-Powered Controllers.
Industrial Automation Serial Interfaces
The MAX3221IPW suits legacy RS-232 service ports on industrial controllers because it combines one 250 kbps driver, one receiver with a dedicated enable, and operation from 3 V to 5.5 V in a 16-pin TSSOP. The interface can translate between a controller’s low-voltage UART signals and the bipolar RS-232 levels used by older equipment. Its ±15 kV ESD protection on serial-port pins adds useful device-level ruggedness in electrically noisy environments, although chassis grounding and cable surge protection remain required.
Recomendado
Embedded Point-to-Point Serial Links
The MAX3221IPW is appropriate when a microcontroller must connect directly to one RS-232 endpoint at up to 250 kbps. Its 3.3 V-compatible supply lets it operate alongside modern embedded logic while accepting 5 V logic input, and the single-driver/single-receiver arrangement avoids allocating unused channels. The dual charge-pump circuit uses only 0.1 µF external capacitors, helping keep the interface area small, but the external connector and signal-ground path still require careful layout.
Recomendado
Test and Measurement Equipment
The MAX3221IPW can provide a compact control or service interface for test and measurement instruments that retain an RS-232 port. At a maximum 250 kbps, it is suitable for configuration commands, status reporting, and legacy instrument control rather than high-volume data transfer. The 3 V to 5.5 V supply range supports mixed-generation instrument logic, while ±15 kV ESD protection on the serial connection improves robustness in bench and field environments.
Recomendado
Security and Access-Control Systems
The MAX3221IPW is useful for access-control panels and security equipment that expose an RS-232 configuration or diagnostics port. The dedicated receiver-enable pin provides a controllable receive path, and the device’s 1 µA typical standby current can assist low-power implementations. Its single-channel architecture is adequate for command-and-response links up to 250 kbps. Because access-control systems may connect to external cables, designers should pair the device rating with proper connector grounding, shield termination, and system-level surge protection.
Recomendado
Network Equipment Maintenance Ports
The MAX3221IPW can implement a basic maintenance or out-of-band console connection for networking equipment, where one RS-232 link must be added in a limited board area. The 16-pin TSSOP footprint, 0.1 µF charge-pump capacitors, and 3.3 V operation support compact designs. Its 250 kbps limit is more than adequate for console sessions and configuration traffic. Keeping the RS-232 traces away from Ethernet magnetics and high-speed lines is important to prevent both EMI coupling and ground-current interference.
Recomendado
Portable and Battery-Powered Controllers
The MAX3221IPW can support RS-232 connectivity in portable instruments and battery-powered controllers that require a legacy port. Its 3 V minimum supply aligns with common 3.3 V systems, while the 1 µA typical standby current helps reduce consumption when the interface is inactive. The MAX3221IPW is limited to one channel and 250 kbps, so it should be selected for control or diagnostic traffic rather than bulk data transfer. Efficient standby use still depends on correct enable control and the charge-pump capacitor arrangement specified by the manufacturer.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX3221IPW — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX3221ECPWR | MAX3221ECPWG4 | MAX3221CPWR | SN75C3221PWR | TRS3221EIPWR |
|---|---|---|---|---|---|---|
| Package | TSSOP-16 | TSSOP-16 | TSSOP-16 | TSSOP-16 | TSSOP-16 | TSSOP-16 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Transceiver Configuration | 1 driver and 1 receiver | Single-channel RS-232 transceiver | Single-channel RS-232 transceiver | Single-channel RS-232 transceiver | Single-channel RS-232 transceiver | Functionally equivalent single-channel RS-232 transceiver |
Diferenciadores clave
- Documented high-level ESD protection (frente a SN75C3221PWR)
- Explicit receiver-control function (frente a TRS3221EIPWR)
- Compact 3.3 V-compatible integration (frente a MAX3221CPWR)
Notas de diseño
Place the MAX3221 charge-pump capacitors directly beside the corresponding IC pins and keep the charge-pump current loop compact. Route the RS-232 connector nets away from clocks, ADC inputs, and sensitive analog circuitry. The connector ground and shield should connect to the system reference network through a deliberate path; do not rely on a high-speed digital return current as the signal-ground route.
Treat the RS-232 connector as an external cable entry point even though the device provides ±15 kV ESD protection. Use a low-impedance chassis or signal-ground connection, provide shield termination appropriate to the equipment, and consider external protection for lightning or industrial surge events. Keep protected connector traces short and avoid routing them beneath the transceiver or unrelated digital circuits.
Decouple the MAX3221 supply close to the VCC and charge-pump supply pins with the capacitance required by the manufacturer datasheet. Keep high-current return paths out of the sensitive receiver reference area. Because the charge pump generates bipolar RS-232 levels from a low-voltage supply, stable local supply decoupling helps prevent disturbance from reaching the connected controller.
Do not assume that two RS-232 transceivers are interchangeable solely because both are labeled single-channel and use TSSOP-16. Before substituting MAX3221ECPWR, SN75C3221PWR, or TRS3221EIPWR, verify the numbered pin map, receiver-enable polarity, temperature range, supply limits, data rate, external capacitor values, and ESD rating. Also verify that the alternative's driver and receiver directions align with the PCB traces.
Información de cumplimiento
The supplied verified excerpts do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is treated as not applicable because the MAX3221IPW is an industrial interface IC rather than an automotive-qualified device in the provided data.