MAX232EID - 120kbps RS-232 Transceiver | Texas Instruments
料号： MAX232EID ✓ 量产中MAX232EID 概述
An RS-232 transceiver is an interface IC that translates logic-level signals between a host or controller and a noisy, long-distance serial link. The MAX232EID uses a capacitive voltage generator to produce the positive and negative voltages required by TIA/EIA-232-F and ITU V.28 interfaces. This places it within the RS-232 transceiver, interface IC, and broader semiconductor hierarchy.
Key features include operation from one 5 V supply, support for 1.0 µF charge-pump capacitors, a maximum data rate of 120 kbit/s, and receiver input levels extending to ±30 V. According to the Texas Instruments MAX232E product information, all RS-232 pins provide 15 kV human-body-model protection, 15 kV IEC61000-4-2 air-gap discharge protection, and 8 kV IEC61000-4-2 contact-discharge protection.
The MAX232EID combines two drivers and two receivers with the internal charge-pump circuitry required to generate bipolar RS-232 voltage levels from a 5 V supply. Its receivers convert incoming RS-232 signals to 5 V TTL or CMOS levels, while its drivers convert TTL or CMOS logic into TIA/EIA-232-F-compatible output levels. This integration simplifies legacy serial-port and industrial-control designs.
Typical applications include RS-232 ports on embedded systems, industrial controllers, test equipment, data-acquisition systems, and legacy computer peripherals. The 120 kbit/s operating rate supports many point-to-point serial links, while the enhanced ESD ratings are useful where a cable or connector can expose the interface to electrostatic discharge.
Use the pin-description and typical-application information in the manufacturer datasheet when assigning connector and protection components. Confirm the external charge-pump capacitor values, supply decoupling, logic-level compatibility, and connector-side protection against the operating environment before releasing a PCB layout.
This page combines the manufacturer specifications with practical interface guidance, package details, and verified drop-in comparison information. It helps engineers assess the MAX232EID for legacy RS-232 connectivity, identify compatible alternatives, and plan ESD-aware PCB implementation without changing the core transceiver architecture.
直接替换替代料： MAX232EID ——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： MAX232EID （相同外形与封装尺寸） ——差异在于 Package, Maximum Data Rate, Supply Voltage.
MAX232EPE+
✅ 直接替换📋 参考替代料（不在目录中）
MAX232DID
✅ 直接替换📋 参考替代料（不在目录中）
MAX202CDR
✅ 直接替换联系询价
查看数据手册 →MAX202CWE+
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →MAX3232CSE+
✅ 直接替换联系询价
查看数据手册 →MAX232EID 规格参数
| Product Type | Dual RS-232 line driver and receiver |
| Number of Driver Channels | 2 |
| Number of Receiver Channels | 2 |
| 电源电压 | 5 V |
| Maximum Data Rate | 120 kbit/s |
| RS-232 Output Voltage | ±9 V |
| Receiver Input Voltage | ±30 V |
| Charge-Pump Capacitor Value | 1.0 µF |
| Number of Charge-Pump Capacitors | 4 |
| Human-Body-Model ESD Protection | 15 kV |
| IEC61000-4-2 Air-Gap ESD Protection | 15 kV |
| IEC61000-4-2 Contact Discharge Protection | 8 kV |
| Logic Compatibility | 5 V TTL/CMOS |
| Interface Compliance | TIA/EIA-232-F and ITU V.28 |
| 封装 | 16-pin SOIC |
| 安装类型 | Surface mount |
MAX232EID 16-pin soic 引脚配置指南
MAX232EID（16-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： MAX232EID.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MAX232EID 适用于 6 应用s: Industrial Controller RS-232 Port, Data-Acquisition Equipment, Test and Measurement Instruments, Embedded Equipment Service Port, Legacy Peripheral Connectivity, RS-232-to-TTL Serial Interface.
Industrial Controller RS-232 Port
The MAX232EID fits an industrial controller that must translate 5 V logic into TIA/EIA-232-F levels for a point-to-point serial link. Its two-driver and two-receiver arrangement supports two serial channels, while the 120 kbit/s rate covers many legacy controller protocols. The stated 15 kV HBM, 15 kV IEC61000-4-2 air-gap, and 8 kV contact-discharge ratings improve robustness at a connector exposed to cable-borne electrostatic discharge.
推荐
Data-Acquisition Equipment
The MAX232EID can interface a data-acquisition controller with a legacy instrument over RS-232. Two receivers allow the controller to consume command acknowledgements and status information, while two drivers support outbound commands and requests. Operation from one 5 V supply and use of four external 1.0 µF charge-pump capacitors simplify the interface, although receiver inputs extending to ±30 V require correct signal conditioning and grounding.
推荐
Test and Measurement Instruments
The MAX232EID is suitable for legacy test equipment that accepts command strings and returns measurement data through an RS-232 port. A 120 kbit/s link rate supports instruments using serial configuration protocols, and the two-channel structure permits simultaneous status and data paths where the connected protocol permits it. Place the transceiver close to the DB9 or equivalent connector and incorporate suitable chassis grounding and connector protection for bench and field use.
推荐
Embedded Equipment Service Port
The MAX232EID can provide a service and configuration port on embedded industrial equipment while the product retains a 5 V logic domain. Its two drivers and two receivers enable a local console or external controller to exchange commands and diagnostic information. The enhanced ESD ratings are especially relevant when the port is exposed during installation, but the connector cable, chassis, and protective ground must be designed as part of the complete electrostatic-discharge system.
推荐
Legacy Peripheral Connectivity
The MAX232EID allows a modern controller with 5 V CMOS logic to communicate with a legacy peripheral that uses a TIA/EIA-232-F port. The integrated charge-pump voltage generator produces the required positive and negative signal levels from one 5 V supply, avoiding a separate bipolar supply. For designs operating at the 120 kbit/s limit, verify cable length, capacitive loading, driver slew behavior, and receiver thresholds against the manufacturer data.
推荐
RS-232-to-TTL Serial Interface
The MAX232EID is useful in interface adapters that connect a TTL/CMOS-based controller to an RS-232 bus or device. Its receivers translate incoming bipolar RS-232 signals to 5 V logic levels, while its drivers provide the complementary conversion in the transmit direction. Four external 1.0 µF capacitors support the internal charge pump, and decoupling must be placed close to the supply pins to control supply noise on the logic side of the board.
推荐
推荐产品汇总
工程参考数据： MAX232EID ——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 | MAX232EPE+ | MAX232DID | MAX202CDR | MAX202CWE+ | MAX3232CSE+ |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | 16-pin SOIC | 16-pin SOIC | 16-pin SOIC | 16-pin SOIC | 16-pin SOIC | 16-pin SOIC |
| Transmitter Count | 2 | 2 | 2 | 2 | 2 | 2 |
| Receiver Count | 2 | 2 | 2 | 2 | 2 | 2 |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
关键差异点
- Enhanced IEC61000-4-2 protection on every RS-232 pin （对比 MAX232DID)
- Close same-family electrical match （对比 MAX232EPE+)
- Higher supported data rate than MAX202-family substitutes （对比 MAX202CDR)
设计说明
Route the four 1.0 µF charge-pump capacitors using the shortest practical paths specified by the manufacturer application circuit. Keep each capacitor close to its associated IC pin, minimize loop area, and place the device-side of each capacitor next to the relevant supply or pump node. This reduces switching transients and prevents the charge-pump network from disturbing nearby logic traces.
Do not treat the MAX232EID as a logic-level RS-232 driver with ±5 V output. The capacitive voltage generator must develop bipolar levels compliant with TIA/EIA-232-F, while the receiver converts those bipolar inputs into 5 V TTL or CMOS levels. Verify the charge-pump capacitor value, polarity, supply decoupling, and logic thresholds before assembling the prototype.
Use a solid ground reference between the transceiver and connector shield, and provide a low-impedance return path for externally arriving discharge current. The internal ESD ratings protect the device pins, but they do not replace connector-side protection, chassis grounding, cable design, or an enclosure strategy. Validate the completed system with the applicable IEC61000-4-2 test configuration.
Check receiver thresholds and driver rise or fall behavior when the cable is long, the baud rate is high, or the remote device uses unusual RS-232 timing. The MAX232EID supports up to 120 kbit/s, but the practical communication distance also depends on cable capacitance, loading, grounding, and the connected equipment. Avoid substituting MAX202-family parts when the original design requires the full MAX232EID data-rate rating.
合规信息
The MAX232E product information identifies IEC61000-4-2 air-gap and contact-discharge protection. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status were not stated in the available records.