MAX3232CDW - 250kbps Dual RS-232 Transceiver | TI
Référence : MAX3232CDW ✓ ActifMAX3232CDW Présentation
An RS-232 transceiver is an interface IC that converts logic-level signals into RS-232 line voltages and converts received line voltages back into digital logic levels. It belongs to the interface IC hierarchy, where a transceiver connects a UART or other serial controller to a physical RS-232 port. The MAX3232 also provides level translation between CMOS logic and bipolar RS-232 signaling.
Key features include two RS-232 drivers, two RS-232 receivers, operation from a 3 V to 5.5 V supply, and a maximum data rate of 250 kbit/s. Its typical supply current is 300 µA, helping minimize power consumption in equipment that maintains an RS-232 port. The specified ±15 kV ESD protection applies to the serial-port terminals, including ground, improving robustness when cables are connected or disconnected.
The MAX3232 meets or exceeds the requirements of TIA/EIA-232-F and ITU V.28 standards. It uses external 0.1 µF charge-pump capacitors to generate the positive and negative voltage levels required by RS-232. These capacitors must be placed close to the charge-pump pins because excessive trace resistance and inductance can reduce driver output performance or disrupt startup.
Typical applications include industrial serial controllers, point-of-sale terminals, data acquisition equipment, test systems, and legacy peripheral connections. The dual-channel arrangement allows one port to transmit and receive simultaneously, while dual transceivers can support two complete RS-232 ports when additional multiplexers or connectors are used. The 16-pin SOIC package also simplifies assembly in conventional surface-mount industrial and commercial equipment.
The primary design consideration is maintaining the exact capacitor values and placement specified by the manufacturer datasheet. Designers should also account for RS-232's unbalanced signaling, use suitable protection around external connectors, and avoid interpreting the ±15 kV ESD rating as immunity to every surge or ESD event. This page combines verified technical specifications, sourcing information, drop-in alternatives, and practical integration guidance.
Alternatives de remplacement direct pour MAX3232CDW — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
MAX3232EIDWR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX3232ECDWR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX3232CDBR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX3232CDW Spécifications
| Product Type | Dual RS-232 line driver/receiver transceiver |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Supply Voltage Range | 3 V to 5.5 V |
| Maximum Data Rate | 250 kbit/s |
| Typical Supply Current | 300 µA |
| Logic Input Compatibility | 5 V logic |
| External Capacitor Value | 0.1 µF |
| ESD Protection | ±15 kV |
| RS-232 Compliance | TIA/EIA-232-F and ITU V.28 |
| Boîtier | 16-SOIC, 7.50 mm width |
| Type de montage | Surface mount |
Guide de configuration des broches du MAX3232CDW 16-soic, 7.50 mm width
Configuration des broches du MAX3232CDW (boîtier 16-soic, 7.50 mm 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 MAX3232CDW.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MAX3232CDW convient pour 6 applications: Industrial Serial Data Acquisition, Point-of-Sale Terminal Interface, Test and Measurement Equipment, Legacy Computer Serial Port, Embedded Controller Communication, Medical and Diagnostic Equipment.
Industrial Serial Data Acquisition
The MAX3232CDW fits industrial data-acquisition equipment that must communicate with legacy RS-232 instruments over short cable runs. Its two drivers and two receivers support bidirectional serial traffic, while the verified 250 kbit/s rate provides ample margin for typical command and measurement transfers. The 3 V to 5.5 V supply range accommodates both 3.3 V and 5 V control electronics. Because the interface is unbalanced, designers should use a suitable common ground, limit cable exposure, and rely on the specified ±15 kV terminal ESD protection together with enclosure-level protection.
Recommandé
Point-of-Sale Terminal Interface
The MAX3232CDW is suitable for point-of-sale terminals and peripheral controllers that retain an RS-232 connector for printer, scanner, or service-console compatibility. The 250 kbit/s capability exceeds the throughput of many legacy peripheral ports, while 5 V logic acceptance simplifies interfacing with a 5 V UART. The 300 µA typical supply current helps when the interface must remain available in low-power operating states. Board layout should keep the four 0.1 µF charge-pump capacitors short and should route the exposed connector through suitable transient-protection hardware.
Recommandé
Test and Measurement Equipment
The MAX3232CDW can connect a test instrument or laboratory controller to older RS-232 equipment. Two drivers and two receivers allow simultaneous command transmission and response reception, and the verified 250 kbit/s rate supports moderate-speed instrument protocols. Operating from 3 V to 5.5 V permits use in embedded test platforms that lack a dedicated 5 V interface rail. For reliable measurements, keep the transceiver ground connected to the instrument ground, minimize cable exposure, and avoid relying on the internal ESD rating as a substitute for a properly engineered connector protection network.
Recommandé
Legacy Computer Serial Port
The MAX3232CDW is useful when a modern controller must retain compatibility with a legacy computer or peripheral RS-232 port. Its full-duplex 2/2 channel arrangement supports transmit and receive paths, and its 250 kbit/s maximum data rate covers the common serial-port speeds used by legacy equipment. The 5 V logic input compatibility simplifies use with conventional UART hardware, while operation down to 3 V allows a compact controller to share a 3.3 V supply. Verify the legacy device’s voltage levels and ground reference before connecting, because RS-232 uses bipolar voltage signaling.
Recommandé
Embedded Controller Communication
The MAX3232CDW provides a simple physical layer between a microcontroller or embedded processor UART and an RS-232 connector. The 250 kbit/s rate is suitable for configuration transfers, diagnostics, and short command sessions, while the 3 V to 5.5 V supply range accommodates both 3.3 V and 5 V designs. Logic compatibility eliminates the need for a separate line-driver IC in many applications. Firmware must avoid assuming RS-232 signal polarity is TTL-compatible, and the PCB must provide local charge-pump capacitors plus appropriate connector-side protection.
Recommandé
Medical and Diagnostic Equipment
The MAX3232CDW can provide service-port connectivity in medical and diagnostic equipment designed around an RS-232 service interface. The 2/2 full-duplex configuration supports command and response traffic, and the ±15 kV terminal ESD protection adds a layer of ruggedness for accessible connectors. Its 250 kbit/s rate is more than adequate for configuration and diagnostic traffic. The device itself is not represented as an AEC-Q100 or medical-grade-qualified component, so the finished system must address electrical isolation, applicable regulatory requirements, fault behavior, and patient-safety boundaries separately.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX3232CDW — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX3232EIDWR | MAX3232ECDWR | MAX3232CDBR |
|---|---|---|---|---|
| Package | 16-SOIC (DW) | 16-SOIC (DW) | 16-SOIC (DW) | 16-SOIC (DBR) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Driver/Receiver Channels | 2 drivers, 2 receivers | 2 drivers, 2 receivers | 2 drivers, 2 receivers | 2 drivers, 2 receivers |
| Maximum Data Rate | 250 kbit/s | 250 kbit/s | 250 kbit/s | 250 kbit/s |
Principaux différenciateurs
- Verified dual full-duplex RS-232 channel arrangement (vs MAX3232EIDWR)
- 250 kbit/s operation with low 300 µA typical supply current (vs MAX3232ECDWR)
- ±15 kV terminal ESD protection in a 16-SOIC package (vs MAX3232CDBR)
Notes de conception
Place the four required 0.1 µF charge-pump capacitors directly beside their associated MAX3232CDW pins. Use short PCB traces with low inductance and a solid ground plane, and avoid routing the capacitor connections through long copper paths. The capacitor loop carries rapidly changing charge-pump current, so long connections can increase ringing and reduce the reliability of the generated RS-232 voltage rails.
Do not treat the ±15 kV ESD figure as complete connector protection. Use it as the device-level rating and evaluate whether the external connector path requires series impedance, TVS devices, shielding, or chassis grounding. Also verify the connected RS-232 equipment uses compatible bipolar voltage levels and a common ground; a TTL-level signal or missing ground connection can produce unreliable operation even when the transceiver itself is functioning correctly.
Keep the RS-232 driver outputs and receiver inputs away from clocks, switching regulators, and sensitive analog inputs. Maintain the ground connection between the interface board and connected equipment, and route the cable-side portion of the interface with minimal loop area. Because RS-232 is unbalanced, long cable runs and large ground-potential differences can reduce noise immunity regardless of the transceiver's specified data rate.
Decouple the MAX3232CDW supply locally with placement consistent with the manufacturer's recommended circuit. The charge-pump capacitors generate the positive and negative voltages needed by the RS-232 drivers, so unstable or noisy supply voltage can affect signaling margin. Do not estimate the charge-pump voltage from nominal 5 V logic levels; verify the driver output levels and receiver thresholds against the connected equipment using the manufacturer datasheet.
Informations de conformité
The supplied manufacturer and distributor excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The MAX3232 is described as meeting or exceeding TIA/EIA-232-F and ITU V.28, but that protocol compliance is not a substitute for material-compliance declarations.
