MAX232EID - 120kbps RS-232 Transceiver | Texas Instruments
MPN： MAX232EID ✓ 啟用中MAX232EID 概覽
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.
直接替換替代品，適用於 MAX232EID — 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。
此系列的變體
與下列產品可直接替換的同系列型號： MAX232EID （相同外形與佔位） — 差異在於 Package, Maximum Data Rate, Supply Voltage.
MAX232EPE+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX232DID
✅ 直接替換📋 參考替代品（不在目錄中）
MAX202CDR
✅ 直接替換聯絡詢價
查看資料表 →MAX202CWE+
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MAX3232CSE+
✅ 直接替換聯絡詢價
查看資料表 →MAX232EID 規格
| Product Type | Dual RS-232 line driver and receiver |
| Number of Driver Channels | 2 |
| Number of Receiver Channels | 2 |
| 供應電壓 | 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 |
| 封裝 | 16-pin SOIC |
| 安裝類型 | Surface mount |
MAX232EID 16-pin soic 腳位配置指南
MAX232EID（16-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： MAX232EID.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX232EID 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 MAX232EID — 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 | 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 |
主要差異化特點
- Enhanced IEC61000-4-2 protection on every RS-232 pin (對比MAX232DID)
- Close same-family electrical match (對比MAX232EPE+)
- Higher supported data rate than MAX202-family substitutes (對比MAX202CDR)
設計說明
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.
合規資訊
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.