MAX3243IDW - 250kbps 3/5 RS-232 Transceiver | Texas Instruments
MPN： MAX3243IDW ✓ 啟用中MAX3243IDW 概覽
An RS-232 transceiver is an interface IC that converts between single-ended logic-level signals and the bipolar voltage levels used by RS-232 equipment. It combines drivers, receivers, and often charge-pump voltage-generation circuitry into one package. This integrated approach reduces external component count and helps designers implement PC serial ports, industrial controls, data-collection equipment, and other systems that require reliable serial communication over longer cable runs.
The MAX3243IDW operates from a 3 V to 5.5 V supply, allowing use in both 3.3 V and 5 V systems. Its 250 kbps signaling rate supports legacy serial-port data rates and other multichannel RS-232 links. Individual channel enable and shutdown functions provide control over transmitter and receiver activity, while AutoShutdown operation reduces supply current when no valid signal is present. The integrated charge pump supports standard RS-232 voltage generation without an external DC-DC converter.
Electrical protection is a significant feature for connector-facing circuits. The MAX3243 provides ±15 kV ESD protection using the Human Body Model on RS-232 bus pins. Protection does not replace proper connector design, external surge protection, or controlled cable routing, but it adds a useful barrier against electrostatic discharge encountered during handling and field installation.
Typical applications include DE-9 serial-port interfaces, industrial data acquisition, point-of-sale equipment, test and measurement systems, and embedded control systems that exchange commands or diagnostic data with RS-232 peripherals. The three-driver and five-receiver arrangement is especially useful when one controller must communicate with multiple external devices while maintaining independent transmit control.
Design should account for charge-pump capacitor selection, local bypassing, unused-channel configuration, and the voltage-versus-current behavior of RS-232 drivers. Keep ground and signal routing consistent with the referenced design, place bypass and charge-pump components close to the device, and validate cable length and data rate together because both influence signal integrity and receiver margin.
This product page combines the manufacturer's electrical and package information with practical interface guidance, application scenarios, parameter-level comparisons, and replacement criteria. It is intended to help engineers determine whether the MAX3243IDW meets voltage, channel-count, data-rate, ESD, package, and lifecycle requirements before committing it to an RS-232 design.
直接替換替代品，適用於 MAX3243IDW — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品MAX3243IDW 規格
| Product Type | Multichannel RS-232 line driver and receiver |
| Supply Voltage Range | 3 V to 5.5 V |
| Maximum Data Rate | 250 kbps |
| Number of Drivers | 3 channels |
| Number of Receivers | 5 channels |
| ESD Protection | ±15 kV using the Human Body Model |
| AutoShutdown Supply Current | 1 µA |
| Technology | RS-232 and CMOS |
| 工作溫度範圍 | -40 °C to +85 °C |
| 封裝 | 28-pin DW SOIC |
| 腳位數 | 28 pins |
| 安裝類型 | Surface mount |
| RS-232 Compliance | TIA/EIA-232-F and ITU V.28 |
| Single-Supply Operation | 3 V to 5.5 V single supply |
MAX3243IDW 28-pin dw soic 腳位配置指南
MAX3243IDW（28-pin dw soic 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： MAX3243IDW.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX3243IDW 適用於 6 應用s: DE-9 Serial-Port Interface, Industrial Data Acquisition, Point-of-Sale Terminal, Test and Measurement Control, Embedded Controller Serial Link, Security and Access-Control Equipment.
DE-9 Serial-Port Interface
The MAX3243IDW fits a DE-9-style serial interface because it combines three drivers and five receivers in one 28-pin DW SOIC. Its 250 kbps data-rate capability covers conventional RS-232 communication, while the 3 V to 5.5 V supply range allows operation in both 3.3 V and 5 V equipment. The ±15 kV Human Body Model protection on bus pins adds defense at connector-facing circuits. Place bypass and charge-pump capacitors according to the manufacturer's layout, route the cable return with the signal paths, and validate the complete interface against the selected cable length and baud rate.
推薦
Industrial Data Acquisition
The MAX3243IDW is appropriate for industrial acquisition equipment that connects a controller to several RS-232 instruments. Three independently controlled transmit channels and five receive channels reduce the number of separate interface ICs required by the board. Operation from 3 V to 5.5 V supports embedded controllers operating on 3.3 V, while 250 kbps provides ample margin for many legacy measurement protocols. The connector-facing ±15 kV Human Body Model protection rating is useful in equipment that may be handled during installation, although external surge and cable protection may still be required.
推薦
Point-of-Sale Terminal
The MAX3243IDW can support point-of-sale equipment that communicates with receipt printers, scanners, cash drawers, or service consoles over RS-232. Its three transmitters and five receivers provide useful channel flexibility for consolidating peripheral connections into one interface circuit. The single 3 V to 5.5 V supply range simplifies adaptation between embedded systems operating at 3.3 V and conventional 5 V peripherals. Use the MAX3243IDW ESD rating as part of the overall enclosure and connector protection strategy, and verify each peripheral's logic levels, handshake signaling, and cable requirements before finalizing the interface.
推薦
Test and Measurement Control
The MAX3243IDW is useful in test and measurement instruments that communicate with computers, controllers, or service interfaces through RS-232. The combination of three drivers, five receivers, and a 250 kbps maximum data rate supports command and response channels while avoiding several discrete interface packages. Its 3 V to 5.5 V operating range allows integration with both legacy 5 V equipment and modern 3.3 V control hardware. Keep connector traces away from sensitive measurement circuits, provide a stable ground reference, and test the complete cable path because baud rate, cable length, and grounding jointly determine practical RS-232 reliability.
推薦
Embedded Controller Serial Link
The MAX3243IDW suits embedded controllers that need a compact multi-channel RS-232 interface to external modules. It supports a 3.3 V system supply without requiring a separate 5 V rail, while its 250 kbps capability is substantially above many legacy peripheral baud rates. Automatic shutdown and per-channel control can help reduce unnecessary transmitter activity in systems where not every port is continuously populated. Confirm the controller's UART logic levels, implement the manufacturer's charge-pump capacitor arrangement, and test signal margins with the longest intended cable and the most demanding peripheral configuration.
推薦
Security and Access-Control Equipment
The MAX3243IDW can support access-control and security equipment that uses RS-232 for configuration, diagnostics, or peripheral connections. The multi-channel arrangement allows one controller to manage several RS-232 destinations, while the 3 V to 5.5 V supply range accommodates both legacy and embedded logic domains. Its ±15 kV Human Body Model bus-pin protection is beneficial in systems that may be serviced or installed by field personnel. Protection must still be coordinated with the enclosure, connector, grounding, and external surge controls because integrated ESD protection does not eliminate every transient or wiring fault.
推薦
推薦產品摘要
工程參考資料，適用於 MAX3243IDW — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Product Type | Multichannel RS-232 line driver and receiver |
| Brand | Texas Instruments |
| Package | 28-pin DW SOIC |
| Supply Voltage Range | 3 V to 5.5 V |
| Maximum Data Rate | 250 kbps |
| Number of Drivers | 3 channels |
| Number of Receivers | 5 channels |
| ESD Protection | ±15 kV Human Body Model |
| Operating Temperature Range | -40 °C to +85 °C |
| AutoShutdown Supply Current | 1 µA |
| RS-232 Compliance | TIA/EIA-232-F and ITU V.28 |
主要差異化特點
- Integrated multichannel interface (對比MAX3232IPW)
- Wide single-supply operating range (對比MAX232NSR)
- Connector-facing ESD protection (對比SP232EET-L/TR)
設計說明
Place the MAX3243IDW charge-pump capacitors and supply-bypass components directly beside their associated pins, following the Texas Instruments recommended layout. Keep these high-current loops compact and provide a continuous ground reference near the device. Connector-side return current should follow the cable ground as closely as practical, while long unprotected traces between the transceiver and connector should be minimized to reduce susceptibility to external transients.
Validate RS-232 operation using the intended baud rate, cable length, and peripheral configuration rather than relying only on the 250 kbps headline data rate. RS-232 margin depends on driver voltage, receiver threshold, cable capacitance, grounding, and reflections. Leave receiver and driver channels available for configuration when unused, and verify that no downstream connection can exceed the device's absolute-maximum input or output limits.
Do not treat the ±15 kV Human Body Model rating as protection against every surge, cable fault, or uncontrolled ground difference. Add connector design, chassis grounding, isolation, or external surge protection where the interface can encounter severe transients. Also confirm that the requested MAX3243 suffix provides the required 28-pin DW package, since similar family members use different package and temperature-grade order codes.
合規資訊
The MAX3243IDW is an industrial-temperature RS-232 interface IC, not an automotive-qualified device. Its datasheet states TIA/EIA-232-F and ITU V.28 interface compliance; environmental-material declarations require confirmation from the manufacturer.
