MAX211CDW - 5V 4/5 RS-232 Transceiver | Texas Instruments
MPN： MAX211CDW ✗ 停產MAX211CDW 概覽
An RS-232 transceiver is an interface IC that combines logic-level driver and receiver circuits with the voltage levels required by the TIA/EIA-232-F and ITU V.28 serial-interface standards. These devices translate low-voltage digital signals into bipolar RS-232 levels at the transmitter and convert received bipolar signals back into logic levels. The MAX211CDW also includes a dual charge-pump circuit for generating the required positive and negative voltage rails.
Key features include four RS-232 drivers, five RS-232 receivers, a single 5 V supply, ±15 kV ESD protection on serial-port connection pins, and a maximum data rate of 120 kbit/s. The five receivers provide more receive channels than the four transmit channels, allowing additional modem-control or handshake signals to be monitored without requiring separate receiver circuitry.
The MAX211CDW uses a dual charge-pump architecture together with four small external capacitors to produce the bipolar voltage levels required by an RS-232 link. According to the manufacturer product information, the device provides pin-to-pin ESD protection across the serial-port connection pins, including ground, and meets the electrical requirements of TIA/EIA-232-F. These characteristics make the IC appropriate for legacy and industrial asynchronous serial interfaces.
Typical applications include industrial equipment controllers, data-acquisition systems, instrument interfaces, point-of-sale equipment, and RS-232 ports on embedded systems. The integrated protection is particularly useful where cables connect to external equipment through long or exposed routes, while the 120 kbit/s rate supports common asynchronous serial protocols and simple command exchanges.
Designers should place the charge-pump capacitors close to their associated pins, maintain the recommended external-capacitor values, and provide adequate PCB ground connectivity. Decoupling near VCC is also important because the charge pump and switching elements can return ripple to the supply rail. A clean layout helps preserve signal integrity and makes the protection circuitry more effective.
This page consolidates verified manufacturer and distributor information, identifies same-family drop-in candidates, and adds practical placement guidance, comparison parameters, and application-specific selection criteria that are not presented as a single block in the manufacturer datasheet.
直接替換替代品，適用於 MAX211CDW — 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。
MAX211CWE
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MAX211EWE
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MAX211CDW 規格
| Device Type | Multichannel RS-232 line driver and receiver |
| 供應電壓 | 5 V |
| Number of Drivers | 4 |
| Number of Receivers | 5 |
| Maximum Data Rate | 120 kbit/s |
| RS-232 Output Level | ±9 V |
| ESD Protection | ±15 kV |
| ESD Protected Connections | Pin-to-pin on serial-port connection pins, including GND |
| Standards Compliance | TIA/EIA-232-F and ITU V.28 |
| Charge-Pump Configuration | Dual charge-pump circuit |
| External Charge-Pump Capacitors | 4 capacitors |
| 封裝 | 28-pin SOIC |
| 安裝類型 | Surface mount |
MAX211CDW 28-pin soic 腳位配置指南
MAX211CDW（28-pin 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： MAX211CDW.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX211CDW 適用於 6 應用s: Industrial equipment controller, Data acquisition instrument, Point-of-sale peripheral, Embedded serial diagnostic port, Automated test and measurement equipment, Legacy computer serial-port adapter.
Industrial equipment controller
The MAX211CDW is appropriate for an industrial controller that must communicate with a legacy RS-232 console, printer, scanner, or service port. Its four drivers support multiple command or handshake outputs, while five receivers allow additional status signals to be monitored. The 5 V supply matches many embedded control boards, and the 120 kbit/s operating rate is suitable for conventional asynchronous serial protocols. The ±15 kV ESD protection provides useful defense on externally accessible pins. Engineering validation should still include system-level grounding, cable routing, temperature-grade review, and grounding of the serial-port shield according to the final enclosure and installation requirements.
推薦
Data acquisition instrument
The MAX211CDW can provide the host-side RS-232 connection for a laboratory or field data-acquisition instrument. Four drivers and five receivers support command transmission and the return of measurement status or control signals, while the 120 kbit/s rate is adequate for many sampled data and command traffic streams. Operating from a single 5 V rail simplifies interface design in embedded instruments, and pin-to-pin ESD protection is valuable when the port is exposed to user cables. The finished instrument must still verify logic levels, handshake timing, serial framing, isolation strategy, and regulatory EMC performance, because the transceiver specification alone does not validate the complete instrument interface.
推薦
Point-of-sale peripheral
A point-of-sale terminal or peripheral can use the MAX211CDW to bridge a low-voltage controller to an RS-232 receipt printer, scanner, or customer-display equipment. The five-receiver count provides extra channels for busy, acknowledge, or other handshake monitoring without separate receiver ICs. Its 120 kbit/s rate supports common serial command traffic, and the 5 V operation fits controller boards designed around legacy peripheral interfaces. ±15 kV ESD protection on the serial-port connection pins is especially relevant when equipment is repeatedly connected and disconnected. Production designs should confirm connector pin assignments, cable length, grounding, and the applicable retail-environment compliance requirements.
推薦
Embedded serial diagnostic port
The MAX211CDW is suitable for a diagnostic or service connector on an embedded controller because it combines four transmit channels, five receive channels, and integrated ESD protection in one 28-pin SOIC. The 120 kbit/s limit supports many boot-loader, configuration, and firmware diagnostic protocols without requiring a high-speed physical-layer device. A single 5 V supply simplifies integration with embedded power systems, while the extra receiver can monitor modem-control lines. Firmware designers must define the connector's full signal map and ensure the transmitter is disabled when the interface is not in use. ESD protection supplements rather than replaces correct cable routing, grounding, and connector design.
推薦
Automated test and measurement equipment
The MAX211CDW can serve as the remote-control interface in automated test and measurement equipment that communicates with a host computer over RS-232. Four drivers and five receivers accommodate commands, status lines, and handshake signals, while 120 kbit/s is practical for short control messages and moderate data transfer. The 5 V supply and integrated charge pump reduce the number of external support components, although four charge-pump capacitors are still required. Integrated ±15 kV ESD protection improves robustness in laboratory environments where the interface cable may be handled frequently. Final qualification should check timing margins, ground offsets, and behavior during hot-plug or cable-replacement events.
推薦
Legacy computer serial-port adapter
The MAX211CDW is a practical choice for adding a legacy computer serial port to an embedded controller board. Its four drivers and five receivers support the classic RS-232 subset used for transmit, receive, and hardware-handshake lines, and the 120 kbit/s rate matches many legacy peripheral protocols. Because the IC operates from 5 V, it integrates readily with older system architectures. The 28-pin SOIC package requires care to preserve the exact MAX211 pin mapping during layout. Designers should also assess whether the target computer uses a DB9 connection, whether ground is tied at the connector, and whether an additional galvanic-isolation barrier is required for long cables or high-potential installations.
推薦
推薦產品摘要
工程參考資料，適用於 MAX211CDW — 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 | MAX211CWE | MAX211EWE |
|---|---|---|---|
| Package | 28-pin SOIC | 28-pin SOIC | 28-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Supply Voltage | 5 V | 5 V | 5 V |
| Driver Count | 4 | 4 | 4 |
| Receiver Count | 5 | 5 | 5 |
| Maximum Data Rate | 120 kbit/s | 120 kbit/s | 120 kbit/s |
| RS-232 Output Level | ±9 V | ±9 V | ±9 V |
| ESD Protection | ±15 kV | ±15 kV | ±15 kV |
| Interface Standards | TIA/EIA-232-F and ITU V.28 | TIA/EIA-232-F and ITU V.28 | TIA/EIA-232-F and ITU V.28 |
| Charge-Pump Capacitors | 4 external capacitors | 4 external capacitors | 4 external capacitors |
主要差異化特點
- Five receivers support more monitored signals than a four-driver channel count requires (對比MAX211CWE)
- Integrated ESD protection covers the serial-port connection pins (對比MAX211EWE)
- Single 5 V operation with integrated dual charge-pump generation (對比MAX211CWE)
設計說明
Place the four required charge-pump capacitors close to their designated MAX211 pins and maintain short, direct current paths. Keep the VCC bypass capacitor adjacent to the supply pin and provide an uninterrupted ground plane beneath the interface circuitry. Because the charge pump generates bipolar voltages for the RS-232 drivers, long capacitor traces and split ground planes can increase radiated noise or reduce effective signal margin.
Route the RS-232 driver and receiver nets directly to the connector or protection network without unnecessary stubs. Maintain a common reference ground for the transceiver and connector, and follow the manufacturer's recommendations for connector ground and cable-shield termination. Do not assume that the device's ±15 kV ESD rating makes external protection or system grounding unnecessary; ESD performance also depends on surge current returning through a low-impedance path.
Use a clean 5 V supply and decouple the IC near VCC because charge-pump operation can produce supply ripple and transient current. Confirm the actual operating and shutdown supply currents from the current manufacturer datasheet before sizing the regulator. The supplied source data does not provide current limits, so a conservative regulator and capacitor design should be based on verified operating data rather than assumptions.
合規資訊
The verified data identifies TIA/EIA-232-F and ITU V.28 interface compliance and ±15 kV ESD protection, but it does not provide RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is not applicable because this is an interface IC and no automotive qualification is stated.