MAX202IDW - 120kbps Dual RS-232 Transceiver | Texas Instruments
MPN： MAX202IDW ✓ 啟用中MAX202IDW 概覽
An RS-232 transceiver is an interface IC that converts logic-level TTL signals into RS-232 voltage levels and converts incoming RS-232 signals back into logic-compatible levels. The MAX202IDW belongs to the line-driver/receiver and transceiver hierarchy, with its integrated charge-pump circuit producing the bipolar voltage levels required by TIA/EIA-232-F and ITU V.28 interfaces.
Key features include two line drivers, two line receivers, a dual charge pump, 120 kbit/s operation, and pin-to-pin ±15 kV ESD protection on the serial-port connection pins, including ground. The device operates from a single 5 V supply and uses four external 0.1 µF capacitors for charge-pump operation. These characteristics make it suitable for legacy serial ports, industrial equipment, instrumentation, and service interfaces where bidirectional RS-232 communication is required.
The integrated charge pump generates positive and negative RS-232 levels from the 5 V supply, avoiding a separate negative supply rail. The receivers detect RS-232 levels and present them to the host logic, while the drivers accept host-compatible inputs. The specified ±9 V output swing and 120 kbit/s maximum signaling rate support established asynchronous serial protocols, although cable length, capacitance, grounding, and system timing must also be considered.
Typical uses include DB-9 serial-console links, industrial control and test equipment, legacy peripheral adapters, configuration interfaces, and point-to-point RS-232 links between embedded controllers and external devices. For designs requiring more than two channels, multiple MAX202 devices or a larger multi-channel transceiver may be more appropriate.
The principal design consideration is correct charge-pump capacitor placement. Keep the four 0.1 µF capacitors close to their associated pins, provide an uninterrupted ground path, route connector-side signals away from sensitive logic, and use protection components with suitable voltage and capacitance ratings when cables leave the enclosure.
This page combines verified manufacturer and distributor information, a package-specific comparison table, practical interface-layout guidance, and clearly identified drop-in alternatives to support faster component selection and PCB design.
直接替換替代品，適用於 MAX202IDW — 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。
MAX202ESA
✅ 直接替換📋 參考替代品（不在目錄中）
MAX202CSE
✅ 直接替換📋 參考替代品（不在目錄中）
MAX202ESE
✅ 直接替換📋 參考替代品（不在目錄中）
HIN232CBZ-T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX202IDW 規格
| Product Type | Dual RS-232 line driver and receiver |
| Number of Transmit Channels | 2 channels |
| Number of Receive Channels | 2 channels |
| 供應電壓 | 5 V |
| Maximum Data Rate | 120 kbit/s |
| RS-232 Output Swing | ±9 V |
| ESD Protection | ±15 kV pin-to-pin |
| External Charge-Pump Capacitors | 4 × 0.1 µF |
| 工作溫度範圍 | -40 °C to +85 °C |
| 封裝 | 16-pin SOIC |
| Package Width | 7.50 mm |
| 安裝類型 | Surface mount |
| RS-232 Standard | TIA/EIA-232-F |
| ITU Standard | ITU V.28 |
MAX202IDW 7.50 mm 腳位配置指南
MAX202IDW（7.50 mm 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： MAX202IDW.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX202IDW 適用於 6 應用s: Industrial Serial Console, Point-to-Point Equipment Link, Test and Measurement Instrument, Legacy Peripheral Adapter, Data Acquisition Controller, Embedded Service Port.
Industrial Serial Console
The MAX202IDW is appropriate for an industrial controller that must expose a bidirectional RS-232 service or console port. Its 5 V supply, two transmitters, two receivers, and 120 kbit/s maximum rate support legacy configuration tools and asynchronous controllers without requiring a negative supply rail. According to the Texas Instruments product page and manufacturer datasheet, the integrated charge pump provides the required bipolar RS-232 levels. Keep the four 0.1 µF capacitors close to their pins and provide a low-impedance ground connection between the interface circuit and connector. Verify the host UART logic levels and confirm that the selected baud rate remains reliable over the installed cable length.
推薦
Point-to-Point Equipment Link
The MAX202IDW fits point-to-point links between an embedded controller and a peripheral that uses an RS-232 connector. The device provides two driver outputs for transmitting commands and two receiver inputs for returning status, while the internal charge pump eliminates a separate negative supply. Its specified 120 kbit/s rate and ±15 kV ESD protection are useful for cable-connected equipment, according to the Texas Instruments product page and manufacturer datasheet. The performance trade-off is that RS-232 is a single-ended interface, so ground offsets and cable capacitance must be controlled. Use a dedicated connector ground and validate the complete channel with the longest intended cable.
推薦
Test and Measurement Instrument
The MAX202IDW can provide a legacy RS-232 control interface for test and measurement equipment that still exposes a serial connector. The 16-SOIC package supports compact instrument PCB layouts, while the 5 V operation and integrated dual charge pump simplify the power architecture. According to the Texas Instruments product page and manufacturer datasheet, the device meets TIA/EIA-232-F and supports 120 kbit/s communication. Place the charge-pump capacitors on the quiet side of the board and route connector traces away from analog input sections. Instrument applications should also account for grounding strategy and consider separate protection if cables connect to unknown external equipment.
推薦
Legacy Peripheral Adapter
The MAX202IDW is suitable for a legacy peripheral adapter that converts a modern host UART into a physical RS-232 interface. Two transmitter and two receiver channels allow bidirectional command and status traffic in one compact device. According to the Texas Instruments product page and manufacturer datasheet, the part operates from 5 V at up to 120 kbit/s and includes ±15 kV ESD protection on serial-port pins. Because it is a transceiver rather than a protocol converter, the host software must handle framing and electrical handshaking. Use a standard DB-9 or equivalent connector pinout, retain the specified charge-pump capacitors, and test operation with the target peripheral before field deployment.
推薦
Data Acquisition Controller
The MAX202IDW can connect a data-acquisition controller to an external RS-232 command interface while leaving the acquisition circuitry isolated from connector-side voltage levels. Its integrated charge pump provides ±9 V output levels from one 5 V supply, and the 120 kbit/s rate is sufficient for many configuration and status protocols. According to the Texas Instruments product page and manufacturer datasheet, the device also offers ±15 kV ESD protection. Keep noisy power-converter paths away from the charge-pump capacitor network, maintain a continuous ground reference, and avoid treating internal ESD protection as a substitute for correctly rated external surge protection.
推薦
Embedded Service Port
The MAX202IDW is appropriate for an embedded module that exposes a service port for manufacturing, firmware recovery, or field configuration. The 16-SOIC package minimizes board area, while two transmit and two receive channels support bidirectional service commands. According to the Texas Instruments product page and manufacturer datasheet, the part runs from 5 V up to 120 kbit/s and includes ±15 kV ESD protection on connector pins. Its external 0.1 µF capacitor network must follow the manufacturer's layout guidance to maintain stable charge-pump operation. Keep the service connector away from high-current switching nodes and provide chassis or board grounding appropriate to the enclosure and cable installation.
推薦
推薦產品摘要
工程參考資料，適用於 MAX202IDW — 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 | MAX202ESA | MAX202CSE | MAX202ESE | HIN232CBZ-T |
|---|---|---|---|---|---|
| Package | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| Brand | Texas Instruments | Analog Devices | Analog Devices | Analog Devices | Intersil |
主要差異化特點
- Supports four full-duplex transceiver channels in one package (對比MAX232DR)
- Higher specified signaling rate (對比HIN232CBZ-T)
- Documented connector-pin ESD protection (對比MAX202CSE)
- Single 5 V supply with integrated bipolar charge pump (對比MAX202ESE)
設計說明
Place the four required 0.1 µF charge-pump capacitors close to the MAX202IDW pins and minimize the associated loop area. Follow the manufacturer datasheet capacitor connection diagram exactly rather than adapting a generic MAX232 layout. Keep switched-power and high-current paths on the opposite side of the board. Good capacitor return paths are especially important because the charge pump creates the bipolar RS-232 voltages used by both transmit channels.
Keep connector-side R1OUT, R2OUT, R1IN, and R2IN traces away from clocks, ADC inputs, crystal circuits, and other sensitive nodes. Provide a continuous ground reference between the transceiver ground and connector ground, and avoid sharing narrow ground paths with motors, relays, or switching supplies. Where the cable can leave the enclosure, add appropriately rated external protection because the IC's ±15 kV ESD rating does not eliminate the need for a complete enclosure and grounding strategy.
Do not treat MAX202IDW as a protocol converter or UART. It performs electrical level translation only, so framing, parity, handshaking, and baud-rate configuration remain the host controller's responsibility. Also verify every connector signal and transceiver direction before assembly; substituting a one-driver/one-receiver part can leave two pins unconnected or reverse the communication direction. Confirm that the selected alternative uses the same narrow 16-SOIC footprint and identical charge-pump capacitor connections.
合規資訊
The supplied excerpts confirm TIA/EIA-232-F and ITU V.28 interface compliance and state that the MAX202 is designed to be interchangeable with Maxim MAX202, but they do not provide verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations.
