MAX3232CDW - 250kbps Dual RS-232 Transceiver | TI
部品番号: MAX3232CDW ✓ 生産中MAX3232CDW 概要
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.
ドロップイン代替品: MAX3232CDW — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
MAX3232EIDWR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX3232ECDWR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX3232CDBR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX3232CDW 仕様
| 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 |
| パッケージ | 16-SOIC, 7.50 mm width |
| 実装タイプ | Surface mount |
MAX3232CDW 16-soic, 7.50 mm width ピン配置ガイド
MAX3232CDW (16-soic, 7.50 mm width パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: MAX3232CDW.
詳細は データシート をご参照ください。
主な用途
MAX3232CDW の用途: 6 件s: 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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MAX3232CDW — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- 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)
設計ノート
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.
コンプライアンス情報
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.
