MAX3243EEUI+ - 3/5 RS-232 Transceiver | Analog Devices
Référence : MAX3243EEUI+ ✓ ActifMAX3243EEUI+ Présentation
An RS-232 transceiver is an interface IC that converts logic-level digital signals into RS-232 line levels and converts incoming RS-232 signals back into CMOS-compatible logic. The MAX3243E belongs to the EIA/TIA-232 communications-interface family supporting V.28 and V.24 signaling. Its three-driver, five-receiver arrangement is particularly useful for DE-9 data-terminal-equipment connections, industrial control links, configuration ports, and service interfaces.
Key features include operation from a 3.0 V to 5.5 V supply, a maximum data rate of 250 kbps, ±15 kV human-body-model ESD protection on serial-port pins, and low-power shutdown with automatic wakeup. The shutdown current is specified at 1 µA, while the always-enabled ROUT2B and INVALID outputs provide remote-ring and input-validity monitoring functions.
The MAX3243E architecture supports both 3 V-powered and 5 V-powered systems. Automatic shutdown reduces supply consumption when the associated serial port is inactive, and automatic wakeup allows the interface to resume operation when valid serial activity is detected. This behavior is useful in distributed equipment where multiple RS-232 ports may remain present but unused for extended periods.
Typical applications include industrial serial controllers, test and measurement instruments, point-of-sale terminals, security equipment, embedded service consoles, and legacy computer peripherals. The five receivers also provide extra input channels beyond the three transmit channels, enabling ring-indicator, remote-control, or status-signal monitoring alongside the primary serial connection.
PCB design should preserve the manufacturer-recommended driver and receiver pin assignments, place the charge-pump and interface capacitors at their specified pins, and route exposed connector pins with direct ESD-current paths to ground. Check signal polarity, connector pin assignment, and logic levels before replacing an RS-232 controller with this transceiver.
This page provides a focused selection guide, practical interface-layout notes, and a parameter comparison covering the MAX3243EEUI+ and its identified same-package option. Engineers can use the manufacturer datasheet and product page to confirm final pin routing, timing limits, and operating conditions before releasing a PCB.
Alternatives de remplacement direct pour MAX3243EEUI+ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
MAX3243EEUI
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX3243EEUI+ Spécifications
| Product Type | RS-232 transceiver |
| Number of Drivers | 3 |
| Number of Receivers | 5 |
| Supply Voltage Range | 3.0 V to 5.5 V |
| Maximum Data Rate | 250 kbps |
| ESD Protection | ±15 kV HBM |
| Courant d'arrêt | 1 µA |
| Interface Standard | EIA/TIA-232 |
| V-Series Signaling | V.28 and V.24 |
| Duplex Mode | Full duplex |
| Boîtier | 28-pin TSSOP |
| Type de montage | Surface mount |
| Automatic Shutdown | Supported |
| Automatic Wakeup | Supported |
| ROUT2B Output | Always enabled |
| INVALID Output | Always enabled |
Guide de configuration des broches du MAX3243EEUI+ 28-pin tssop
Configuration des broches du MAX3243EEUI+ (boîtier 28-pin tssop). 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 MAX3243EEUI+.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MAX3243EEUI+ convient pour 6 applications: Industrial Serial Controller Interface, Point-of-Sale Terminal Connectivity, Test and Measurement Equipment, Legacy Computer Peripheral Port, Embedded Service and Diagnostics Port, Security and Access-Control Equipment.
Industrial Serial Controller Interface
The MAX3243EEUI+ fits industrial controllers that must exchange commands and status through an RS-232 connection while operating from a 3.0 V to 5.5 V supply. Three drivers support outbound control signals, while five receivers accommodate incoming data and additional status lines. The 250 kbps rate provides useful bandwidth for configuration traffic, while ±15 kV HBM protection strengthens a cable-connected port exposed to industrial transients. Automatic shutdown and wakeup reduce consumption when the serial link is idle without requiring the host to manage every low-power transition.
Recommandé
Point-of-Sale Terminal Connectivity
The MAX3243EEUI+ can support a point-of-sale terminal that communicates with a peripheral through a legacy RS-232 port. Its three drivers cover primary and secondary transmit paths, while the five receivers leave capacity for handshake, ring, or remote-status signals. Operation from 3.0 V to 5.5 V permits integration with either modern embedded logic or conventional 5 V terminal electronics. The device’s 250 kbps maximum rate is appropriate for transactional data, and AutoShutdown can lower power use when the peripheral port remains connected but inactive.
Recommandé
Test and Measurement Equipment
The MAX3243EEUI+ is well suited to RS-232 service and command ports on test and measurement equipment. Multiple receivers allow the instrument to monitor more than one incoming signal, while the three transmit channels can control accessories or other instruments. The MAX3243E family operates from 3.0 V to 5.5 V and supports data rates up to 250 kbps for command exchange and result transfer. ±15 kV HBM protection adds useful margin on externally accessible ports, although the connector shield and enclosure grounding still require careful implementation.
Recommandé
Legacy Computer Peripheral Port
The MAX3243EEUI+ provides a practical interface bridge between modern controller logic and a legacy RS-232 peripheral. Its three-driver, five-receiver arrangement accommodates the classic DE-9 DTE use case and additional control signals, while the 28-pin TSSOP package supports compact board layouts. The 3.0 V to 5.5 V operating range allows integration across mixed-voltage equipment. At rates up to 250 kbps, the transceiver can handle configuration, status, and firmware-transfer traffic subject to the peripheral’s own protocol and timing limits.
Recommandé
Embedded Service and Diagnostics Port
The MAX3243EEUI+ suits embedded systems that retain a field-service or diagnostics connector using RS-232. Three transmit channels can carry commands or control signals, and five receive channels can support response data plus ring and validity indications. The always-enabled ROUT2B and INVALID outputs are especially useful in systems that need to observe remote signals without placing the entire transceiver into shutdown. With a 250 kbps data rate, automatic wakeup, and a 1 µA shutdown current, the device balances diagnostic capability with low idle consumption.
Recommandé
Security and Access-Control Equipment
The MAX3243EEUI+ can serve as the wired RS-232 interface in access-control panels, readers, and security controllers that exchange commands with a host. The five receivers provide additional input capacity for status and ring signaling, while the three drivers support outbound control paths. Its 3.0 V to 5.5 V supply range simplifies integration into mixed embedded systems, and the 250 kbps rate covers typical administrative and event traffic. The ±15 kV HBM protection rating is useful for a port connected through external cabling, although cable routing and chassis grounding remain essential.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX3243EEUI+ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX3243EEUI |
|---|---|---|
| Brand | Analog Devices | Analog Devices |
| Package | 28-pin TSSOP | 28-pin TSSOP |
| Transceiver Configuration | 3 drivers / 5 receivers | 3 drivers / 5 receivers |
| Supply Voltage Range | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Maximum Data Rate | 250 kbps | 250 kbps |
| ESD Protection | ±15 kV HBM | ±15 kV HBM |
| Shutdown Current | 1 µA | 1 µA |
| AutoShutdown and Wakeup | Supported | Supported |
Principaux différenciateurs
- Five receivers provide more input capacity than the three transmit channels (vs MAX3238ECAI+)
- Supports a 250 kbps RS-232 data rate (vs MAX3243EETJ+T)
- Combines low-power control with always-enabled status outputs (vs MAX3238EEAI+)
Notes de conception
Place all charge-pump capacitors and the required supply capacitors at the pins identified in the manufacturer datasheet, keeping each loop as short as practical. The MAX3243E generates bipolar RS-232 levels through internal charge-pump circuitry, so long capacitor connections can increase transient ringing and emissions. Follow the datasheet’s recommended capacitance and tolerance values rather than substituting a generic bulk-capacitor arrangement.
Route connector-facing RS-232 traces away from clocks, switching-regulator inductors, and high-speed digital nets. Keep the transceiver close to the connector and provide a low-impedance return path for cable surge currents. The ±15 kV HBM rating protects the IC’s serial pins, but ESD energy must still be directed away from sensitive logic through controlled board layout, enclosure grounding, and connector placement.
Confirm driver and receiver polarity, connector mapping, and logic thresholds before layout release. The five receiver channels may carry data, ring indication, or validity signals rather than five independent communication ports, so assigning them by function prevents firmware and hardware mismatches. Use the always-enabled ROUT2B and INVALID outputs according to the manufacturer’s timing and logic definitions.
Do not treat the MAX3243EEUI+ as a differential RS-485 transceiver or as a replacement for a MAX202 or MAX211 circuit without checking the pin map. These devices share the broader RS-232 interface category but can differ in channel count, package, control features, and external support components. The MAX3243EEUI is the closest identified same-package ordering option, while the MAX3238 and MAX3248 references use different packages or configurations.
Informations de conformité
The manufacturer product page confirms the MAX3243E family, but the available information does not establish the target component’s complete regional compliance declarations. The MAX3243EEUI+ is an interface IC rather than an automotive-qualified power device.