MAX202CWE+ - 120kbps Dual RS-232 Transceiver | Maxim
Référence : MAX202CWE+ ✓ ActifMAX202CWE+ Présentation
An RS-232 transceiver is an interface integrated circuit that converts logic-level signals between a host or peripheral and a balanced-looking differential transmission system based on single-ended RS-232 levels. Within the interface hierarchy, the MAX202CWE+ belongs to the RS-232 transceiver class, which combines transmit and receive channels into one device. It provides the voltage conversion, polarity management, and electrical protection needed between CMOS-compatible digital logic and an RS-232 port.
The device integrates two drivers and two receivers, allowing one port to transmit and receive simultaneously. Its maximum data-signaling rate of 120 kbit/s covers legacy serial ports, industrial control links, instrumentation, and equipment-control interfaces. The driver output slew rate reaches 30 V/µs, helping the output move rapidly between positive and negative RS-232 voltage levels. Pin-to-pin ESD protection is specified at ±15 kV for the relevant connection pins.
Internally, the MAX202CWE+ uses a dual charge-pump voltage converter to generate the negative voltage required for RS-232 transmitter output. Two external 0.1 µF capacitors support the charge-pump circuit. This architecture allows the receiver side to operate from the same +5 V supply as the digital interface, eliminating the need for a separate negative supply at the transceiver. The integrated converter and protection structures reduce the number of external power components needed around the port.
Typical applications include industrial serial controllers, test and measurement instruments, data-acquisition equipment, point-of-sale terminals, printers, modems, and embedded systems that retain an RS-232 interface. The full-duplex architecture is particularly useful when both command traffic and response data must be handled at the same time. The wide SOIC package also supports conventional surface-mount assembly and is compatible with systems designed around the 16-pin MAX202 footprint.
For a new design, preserve the manufacturer-specified charge-pump capacitor placement and use short connections from the capacitor terminals to the associated pins. Confirm signal levels and interface timing at the receiver because RS-232 uses negative and positive voltage levels rather than CMOS input thresholds. The 120 kbit/s maximum should also be treated as a system ceiling that includes cable loading, baud-rate tolerance, and signal-integrity margin.
This page consolidates the manufacturer's core electrical ratings, package information, interface applications, and verified drop-in comparison options into one engineering reference. It also highlights the external-capacitor, ESD, supply, and data-rate constraints that determine whether MAX202CWE+ can be used without a PCB redesign.
Alternatives de remplacement direct pour MAX202CWE+ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
MAX202CWE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX202EWE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX201EWE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX202CWE+ Spécifications
| Product Type | Dual RS-232 transceiver with 2 drivers and 2 receivers |
| Tension d'alimentation | +5 V |
| Maximum Supply Voltage | 5.5 V |
| Data Signaling Rate | Up to 120 kbit/s |
| Driver Output Level | ±5 V EIA/TIA-232E |
| Driver Output Slew Rate | Up to 30 V/µs |
| ESD Protection | ±15 kV pin-to-pin on serial-port connection pins |
| Charge-Pump Capacitor | 0.1 µF external capacitor |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Duplex Mode | Full duplex |
| Boîtier | 16-pin wide SOIC, 7.50 mm body width |
| Type de montage | Surface mount |
| Temperature Grade | Commercial |
Guide de configuration des broches du MAX202CWE+ 16-pin wide soic, 7.50 mm body width
Configuration des broches du MAX202CWE+ (boîtier 16-pin wide soic, 7.50 mm body width). 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 MAX202CWE+.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MAX202CWE+ convient pour 6 applications: Industrial Serial Controllers, Test and Measurement Equipment, Point-of-Sale Terminals, Embedded Data Acquisition, Printer and Modem Interfaces, Legacy Communication Port Retrofit.
Industrial Serial Controllers
The MAX202CWE+ fits legacy industrial controller and test equipment that still exposes an RS-232 service port. Its two drivers and two receivers support full-duplex command and response traffic, while the 120 kbit/s signaling rate accommodates common serial-port baud rates below the device maximum. The ±15 kV pin-to-pin ESD protection is particularly valuable when the connector is exposed to user contact or industrial cabling. With a single +5 V supply and external 0.1 µF charge-pump capacitors, the interface avoids a separate negative supply and reduces external power-conversion complexity. Confirm the commercial temperature rating against the installation environment before using it in harsh industrial conditions.
Recommandé
Test and Measurement Equipment
The MAX202CWE+ is appropriate for instruments that need a compact, bidirectional service interface for configuration, diagnostics, and data transfer. Full-duplex operation allows the instrument to return acknowledgments and measurement results without switching the physical link direction. Its maximum 120 kbit/s signaling rate is suitable for legacy control and low-to-moderate-rate data channels, and the ±5 V EIA/TIA-232E driver levels support standard RS-232 receivers. The wide 16-pin SOIC package is useful where a through-hole or TSSOP implementation would be unsuitable. Place the charge-pump capacitors beside the device and maintain a clean return path to reduce conducted disturbance in sensitive instrumentation.
Recommandé
Point-of-Sale Terminals
The MAX202CWE+ can support bidirectional communication with RS-232 receipt printers, scanners, and payment peripherals in point-of-sale equipment. Two transmitters and two receivers allow command traffic and device responses to coexist on a full-duplex interface, which simplifies firmware flow control. The 120 kbit/s capability is more than adequate for many peripheral interfaces operating below that limit, while ESD protection helps reduce damage from cable transients at the exposed connector. The +5 V architecture integrates naturally with legacy POS logic and avoids requiring a separate negative rail. Designers should still verify the peripheral's voltage levels, connector pinout, and handshake timing because RS-232 implementations are not always standardized at the application layer.
Recommandé
Embedded Data Acquisition
The MAX202CWE+ provides a straightforward bridge between embedded controller logic and an RS-232 data-acquisition unit. The host-side interface operates from +5 V, while the integrated charge-pump generates the bipolar driver voltage required by RS-232. With a maximum signaling rate of 120 kbit/s, it suits supervisory commands, status packets, and sampled data streams that remain within the bandwidth limit. Its dual-channel arrangement supports simultaneous transmission and reception, which is useful for command-and-response protocols. The specified ±15 kV ESD protection adds interface robustness when the acquisition equipment is connected to external cables. Validate line capacitance and receiver thresholds when using long cables or unusually high baud rates.
Recommandé
Printer and Modem Interfaces
The MAX202CWE+ is suitable for printer, modem, and terminal interfaces that use the conventional RS-232 port. The device combines two driver outputs and two receiver inputs with an on-chip dual charge pump, allowing the interface to operate from one +5 V supply. Its 120 kbit/s maximum signaling rate accommodates legacy peripheral links while preserving a straightforward digital handshake through the UART. The ±15 kV pin-to-pin ESD rating is useful for ports connected to user-accessible cables. The 16-pin wide SOIC package also makes the device practical for equipment that already uses surface-mount assembly. For a successful replacement, confirm that every footprint pad, enable function, charge-pump connection, and supply pin matches the original design.
Recommandé
Legacy Communication Port Retrofit
The MAX202CWE+ is useful when maintaining or retrofitting an established RS-232 communication port with a 16-pin wide SOIC footprint. It preserves the familiar dual-driver, dual-receiver architecture while providing a documented maximum rate of 120 kbit/s and ±15 kV ESD protection. This makes it suitable for legacy equipment that cannot migrate immediately to another interface standard. Because the integrated charge pump still requires two external 0.1 µF capacitors, an existing board must provide those locations and the associated layout clearance. Review the obsolete or active status of each ordering code, and verify electrical limits rather than relying solely on package shape when treating an alternate as a drop-in replacement.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX202CWE+ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX202CWE | MAX202EWE | MAX201EWE |
|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 16-SOIC wide | 16-SOIC wide - same footprint | 16-SOIC wide - same footprint | 16-SOIC wide - same footprint |
| Device Type | 2/2 full-duplex RS-232 transceiver | 2/2 full-duplex RS-232 transceiver | 2/2 full-duplex RS-232 transceiver | Line transceiver; detailed comparison required |
| Data Rate | 120 kbit/s | 120 kbit/s | 120 kbit/s | 120 kbit/s |
Principaux différenciateurs
- Active MAX202 ordering option (vs MAX202EWE)
- Full 2/2 full-duplex channel count (vs MAX201EWE)
- Single +5 V interface implementation (vs MAX202CWE)
Notes de conception
Place the two 0.1 µF charge-pump capacitors directly beside their associated MAX202CWE+ pins, using the shortest practical traces and solid ground-plane connections. The capacitors carry switching current from the internal charge-pump circuit, so long loops can increase radiated noise and supply ripple. Follow the manufacturer datasheet layout when assigning the capacitor pads, and avoid placing sensitive signal or reference traces directly beneath the charge-pump nodes.
Do not treat every 16-pin RS-232 transceiver as a mechanical substitute. MAX202CPWR uses a 16-pin TSSOP package rather than the wide SOIC body used by MAX202CWE+, so its footprint is not interchangeable without a PCB change. For a true board-level replacement, verify pin numbering, enable behavior, charge-pump connections, supply limits, receiver thresholds, and package width. The MAX202EWE also carries an obsolete status, making lifecycle confirmation essential.
Keep RS-232 driver outputs away from sensitive receiver and analog inputs, and route the logic-side connections as short as practical. Although the device supports a 120 kbit/s signaling rate, cable length, loading, baud-rate tolerance, and receiver thresholds can reduce practical margin. Terminate only as required by the system and interface specification, and keep the ground reference continuous between the equipment and connected RS-232 equipment.
Decouple the +5 V supply locally and route the high-current return directly to the device ground and capacitor ground connections. The integrated charge pump creates the negative voltage required by the drivers, so inadequate supply decoupling can couple switching activity into the logic rails. Keep the MAX202CWE+ supply within its documented 5.5 V maximum and avoid placing sensitive analog loads where charge-pump current could create measurable voltage disturbance.
Informations de conformité
The target's manufacturer product page and the listed product information do not explicitly state the target device's RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The MAX202CWE+ is an interface IC rather than an automotive-qualified AEC-Q100 device.
