MAX211IDW - 5V 120kbps RS-232 Transceiver | Texas Instruments
料号： MAX211IDW ⚠ 最后一次采购MAX211IDW 概述
An RS-232 transceiver is an interface IC that converts logic-level signals into RS-232 line levels and converts received line-level signals back into digital logic. Within the interface hierarchy, MAX211IDW is a multichannel RS-232 transceiver built around four RS-232 line drivers, five line receivers, and a dual charge-pump circuit. This topology allows multiple serial channels to share one supply while providing bipolar voltage generation for the driver outputs.
Key features include a 5 V supply, operation to 120 kbit/s, four line drivers, five line receivers, and ±15 kV ESD protection across the serial-port connection pins, including ground. The device is designed to meet the requirements of TIA/EIA-232-F and ITU V.28. Its additional fifth receiver provides flexibility for monitoring a modem handshake signal when the four main driver and receiver channels are already assigned.
The MAX211 architecture uses a dual charge-pump circuit to generate the positive and negative voltages required by RS-232 drivers. Four small external capacitors support charge-pump operation. The resulting interface can place a communication controller on the logic side and a DB9 or other RS-232 connector on the line side without requiring discrete level-shifting circuits. Pin-to-pin ESD protection extends robustness across exposed serial-port connections.
Typical uses include industrial serial-port adapters, data-acquisition equipment, POS terminals, service interfaces, and legacy computer peripherals. The 120 kbit/s operating rate supports moderate-speed asynchronous communication, while the four-driver and five-receiver arrangement is useful for systems requiring several handshake or control lines. The -40°C to +85°C range also suits industrial environments where commercial-temperature interface ICs may be insufficient.
Designers should use the manufacturer's charge-pump capacitor and bypass-capacitor recommendations, place the external capacitors close to their pins, and keep sensitive logic and communications routing separated from exposed connector and ESD paths. The device is marked last-time-buy by a verified distributor listing, so new designs should confirm availability and consider a supported modern interface before committing to a large production run.
This page combines verified manufacturer and distributor information with lifecycle context, drop-in alternatives, comparison parameters, and practical interface-design guidance. It highlights where MAX211IDW remains suitable for multichannel RS-232 and where supply availability or newer USB-to-serial solutions may be more appropriate.
直接替换替代料： MAX211IDW ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX211IDW （相同外形与封装尺寸） ——差异在于 Driver Output Swing, Operating Temperature Range, Package, RoHS Status.
MAX211CDW
✅ 直接替换联系询价
查看数据手册 →MAX211CDWG4
✅ 直接替换📋 参考替代料（不在目录中）
ADM211ARZ-REEL
✅ 直接替换📋 参考替代料（不在目录中）
MAX211IDW 规格参数
| 电源电压 | 5 V |
| Maximum Data Rate | 120 kbit/s |
| Line Drivers | 4 |
| Line Receivers | 5 |
| ESD Protection | ±15 kV |
| Driver Output Swing | ±9 V |
| 封装 | 28-pin SOIC |
| 工作温度范围 | -40°C to +85°C |
| 安装类型 | Surface mount |
| Interface Standard | RS-232 |
| Compliance Standard | TIA/EIA-232-F and ITU V.28 |
| ESD Test Model | Human Body Model |
| ESD Protected Pins | Serial-port connection pins, including GND |
| Charge-Pump Topology | Dual charge-pump circuit |
| External Charge-Pump Capacitors | 4 capacitors |
| Shutdown Supply Current | Low; numerical value not provided |
| RoHS 状态 | RoHS3 |
MAX211IDW 28-pin soic 引脚配置指南
MAX211IDW（28-pin soic 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： MAX211IDW.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MAX211IDW 适用于 6 应用s: Industrial Serial Port Adapter, Data Acquisition Equipment, Point-of-Sale Terminal Interface, Legacy Computer Peripheral, Communication Controller Interface, RS-232 to RS-485 Gateway.
Industrial Serial Port Adapter
MAX211IDW fits an industrial RS-232 adapter that must translate between a 5 V controller and an exposed DB9 or terminal interface. Its four drivers and five receivers support several data and handshake lines, while the -40°C to +85°C range covers demanding industrial environments. The 120 kbit/s rate is appropriate for legacy configuration and diagnostic protocols rather than high-speed data transfer. Using the fifth receiver for an input-only modem-control signal adds channel flexibility without another transceiver. The ±15 kV ESD protection on serial-port connection pins, including ground, improves robustness when the cable is exposed to user contact or industrial transients.
推荐
Data Acquisition Equipment
MAX211IDW can provide the legacy control interface between a data-acquisition controller and external laboratory or field equipment. Four driver channels can carry commands or handshake signals, and five receiver channels can accept status, acknowledgment, or monitoring signals. The 120 kbit/s maximum is sufficient for low-bandwidth command traffic but not bulk sensor streaming. The -40°C to +85°C specification supports industrial instrumentation, while ±15 kV ESD protection adds an important layer of protection for externally accessible connector pins. A single dual charge-pump section serves all four drivers, simplifying the power architecture compared with multiple discrete interface devices.
推荐
Point-of-Sale Terminal Interface
MAX211IDW is appropriate for legacy point-of-sale equipment that still communicates through an RS-232 connector. The four-driver arrangement supports bidirectional data and control traffic, and the fifth receiver can monitor an additional handshake or status line. Its 120 kbit/s rate matches many peripheral-control protocols but requires careful cable and software support for modern point-of-sale networks. ESD protection is especially valuable in retail equipment where the connector may be handled frequently. The -40°C to +85°C range also allows use in kiosks and terminals installed beyond controlled room conditions. Because the verified lifecycle is last-time-buy, product planners should confirm supply before new deployments.
推荐
Legacy Computer Peripheral
MAX211IDW can preserve an RS-232 connection in legacy computer peripherals, test fixtures, and service equipment that require a direct bipolar serial interface. A modern USB-to-CDC or USB-to-UART bridge is simpler for new designs, but MAX211IDW remains useful when existing equipment expects RS-232 levels and existing cables are already deployed. The 120 kbit/s limit is adequate for configuration, control, and low-speed status transfers. Its four drivers and five receivers support common modem-control arrangements, while the integrated dual charge pump reduces component count. The -40°C to +85°C rating and ±15 kV connector-pin protection improve suitability for long-lived industrial peripherals.
推荐
Communication Controller Interface
MAX211IDW can connect an asynchronous communication controller to a physical RS-232 port while handling both transmit and receive conversion. The four line drivers generate the required bipolar levels, and the five line receivers restore received signals to logic-compatible levels for the controller. At up to 120 kbit/s, the device suits many control-oriented protocols but does not replace high-speed differential buses such as RS-485. The Texas Instruments documentation identifies TIA/EIA-232-F and ITU V.28 alignment, supporting design confidence for legacy serial communication. Correct implementation still requires appropriate connector grounding, cable design, and appropriate protection for the user environment.
推荐
RS-232 to RS-485 Gateway
MAX211IDW can serve as the host-facing RS-232 side of a gateway that connects legacy equipment to a longer-distance differential network. The controller uses the four driver and five receiver channels for serial control and handshake functions, while a separate differential transceiver handles the field-side bus. This partitioning is useful when an existing RS-232 host must communicate with modern RS-485 infrastructure. The 120 kbit/s ceiling limits traffic throughput and should be checked against the gateway protocol. ESD protection on exposed serial-port pins improves survival at the host connector, and the -40°C to +85°C range supports industrial enclosure temperatures. The last-time-buy status requires careful procurement planning.
推荐
推荐产品汇总
工程参考数据： MAX211IDW ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX211CDW | MAX211CDWG4 | ADM211ARZ-REEL |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | 28-pin SOIC | 28-pin SOIC | 28-pin SOIC | 28-pin SOIC |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V |
| Maximum Data Rate | 120 kbit/s | 120 kbit/s | 120 kbit/s | 120 kbit/s |
| Line Drivers | 4 | 4 | 4 | 4 |
| Line Receivers | 5 | 5 | 5 | 5 |
关键差异点
- Verified industrial temperature coverage （对比 MAX211CDW)
- Five receivers provide an additional monitoring channel （对比 ADM211ARZ-REEL)
- Documented 15 kV connector-side ESD protection （对比 MAX211CDWG4)
设计说明
Place the four charge-pump capacitors and the supply bypass capacitor directly beside their associated MAX211IDW pins. Keep the high-voltage RS-232 driver traces away from adjacent logic, clock, and sensitive analog nets. The verified manufacturer description confirms that the charge pump uses four small external capacitors, so following the exact capacitor values and layout in the MAX211 datasheet is necessary to achieve reliable operation.
Route connector-side and charge-pump-node traces conservatively because they can carry switching energy associated with ±9 V driver outputs. Avoid placing test points or long branches directly on charge-pump nodes, and provide a clear return path between the interface ground and connector ground. Keep the logic-side ground reference continuous while respecting the datasheet's guidance on charge-pump capacitor placement.
Do not substitute a modern USB bridge without reviewing the entire communication and power design. MAX211IDW supports legacy RS-232 electrical signaling at up to 120 kbit/s, whereas a USB-to-serial device changes the host interface, connector, driver support, and power requirements. For an actual repair, verify every PCB pin, the 5 V supply, charge-pump capacitors, logic levels, and the connector pinout before fitting a substitute.
合规信息
The verified distributor listing identifies MAX211IDW as RoHS3. The manufacturer states that the interface meets TIA/EIA-232-F, and the verified listing references ITU V.28. No verified AEC-Q100, REACH, lead-free, halogen-free, or conflict-minerals statements were provided.