MAX232ESE+ - Dual RS-232 Transceiver | Maxim Integrated
MPN： MAX232ESE+ ✓ 啟用中MAX232ESE+ 概覽
An RS-232 transceiver is an interface IC that converts low-voltage digital logic signals into RS-232-compatible electrical levels and converts incoming RS-232 signals back into logic-compatible levels. Within the broader hierarchy of interface ICs, transceiver ICs connect processor or controller logic to communication ports. The MAX232 family is especially useful where a positive single supply is available but the external line requires bipolar RS-232 voltage levels.
The MAX232ESE+ uses CMOS circuitry and includes the charge-pump circuitry required to generate the bipolar levels used by the RS-232 drivers. Two driver outputs support transmit channels, while two receiver inputs support receive channels. Its stated operating supply range of 4.5 V to 5.5 V supports conventional +5 V digital systems. The manufacturer describes the family as particularly suitable for battery-powered equipment because a shutdown mode can reduce power consumption when the interface is not active.
Its principal application is point-to-point serial communication between a host controller and an external RS-232 device. Typical examples include industrial control terminals, data-acquisition equipment, service interfaces, and legacy peripheral connections. At data rates up to 120 kbps, the device accommodates many legacy asynchronous serial protocols while operating from a single 5 V rail. A 120 kbps capability should not be confused with the much higher data rates sometimes associated with USB-to-serial converters.
Circuit design requires correct treatment of RS-232 signal levels, including ground reference and, where cable length or noise conditions require it, protection for the external interface. Charge-pump capacitors must be connected exactly as shown in the manufacturer’s recommended application circuit. Keep the charge-pump and communication traces away from sensitive analog inputs, and verify the logic levels and connector-side protection before releasing a board.
This page combines the manufacturer interface specifications, package information, application guidance, and verified cross-reference findings in a format intended for schematic review and sourcing decisions. It also distinguishes pin-compatible alternatives from options that require different packages or electrical changes, helping engineers assess replacement risk before modifying a PCB.
直接替換替代品，適用於 MAX232ESE+ — 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： MAX232ESE+ （相同外形與佔位） — 差異在於 Package, Product Type, Data Rate, ESD Protection, Logic Compatibility.
MAX232ESE+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX232CSE+T
✅ 直接替換聯絡詢價
查看資料表 →MAX232IN
✅ 直接替換聯絡詢價
查看資料表 →SP232ACP-L
✅ 直接替換聯絡詢價
查看資料表 →MAX232ESE+ 規格
| Product Type | Dual RS-232 line driver and receiver transceiver |
| Number of Transmit Channels | 2 channels |
| Number of Receive Channels | 2 channels |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Maximum Data Rate | 120 kbps |
| Interface Standard | EIA/TIA-232E |
| Interface Standard | CCITT V.28 |
| Interface Standard | V.24 |
| Technology | CMOS |
| Package Type | 16-pin SOIC |
| 安裝類型 | Surface mount |
| Shutdown Feature | Available |
MAX232ESE+ 16-pin soic 腳位配置指南
MAX232ESE+（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： MAX232ESE+.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX232ESE+ 適用於 6 應用s: Industrial Controller Serial Port, Data-Acquisition Equipment, Battery-Powered Test Equipment, Legacy Peripheral Adapter, Serial Service and Configuration Port, Point-to-Point Communication Link.
Industrial Controller Serial Port
The MAX232ESE+ fits a legacy industrial controller that exposes a +5 V logic UART but must connect to an RS-232 instrument through a DB9 or terminal connector. Its two transmitters and two receivers support bidirectional serial communication, while the 4.5 V to 5.5 V supply range matches a conventional +5 V control rail. The interface supports data rates up to 120 kbps and targets EIA/TIA-232E, CCITT V.28, and V.24 communications. Place the charge-pump capacitors exactly as specified in the manufacturer application circuit and route the connector-side return conductor to maintain a reliable logic reference.
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Data-Acquisition Equipment
The MAX232ESE+ can connect a data-acquisition controller to a legacy host or service terminal without requiring a separate ±12 V supply. Two receive channels allow the controller to monitor two RS-232 inputs, while two transmit channels support command and data paths. The 120 kbps maximum data rate is suitable for many instrument-control and status-reporting protocols that operate below that limit. Because exposed RS-232 connectors can receive electrical transients, the board should add appropriate connector-side protection and maintain a low-impedance connection between interface ground and the equipment ground.
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Battery-Powered Test Equipment
The MAX232ESE+ is useful in battery-powered test equipment where a full-size PC serial port may be unavailable but an RS-232 service interface is required. Its 4.5 V to 5.5 V operating range suits a +5 V system, and the family’s shutdown capability can reduce consumption when the interface is idle. The two-channel transmit and receive arrangement is adequate for command links, firmware downloads, and diagnostic reporting. Select the external capacitors and protection network from the datasheet, and verify the temperature grade for the product’s portable operating environment.
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Legacy Peripheral Adapter
The MAX232ESE+ enables a modern controller board to communicate with printers, scales, programmers, or other legacy peripherals that use RS-232. The single +5 V supply requirement reduces system complexity compared with an interface that needs separate positive and negative rails. At rates up to 120 kbps, the device supports common asynchronous control protocols while its two drivers and two receivers provide useful channel flexibility. Verify the peripheral’s logic polarity, handshake requirements, connector pinout, and maximum cable distance before deployment, since those details are not standardized across all RS-232 equipment.
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Serial Service and Configuration Port
The MAX232ESE+ is appropriate for a service port used to configure equipment, download firmware, or retrieve diagnostic data. A controller UART can use one transmit channel and one receive channel, while the second pair can support a second device or a hardware-handshake path if required by the system design. The device operates from 4.5 V to 5.5 V and supports up to 120 kbps, making it suitable for many embedded configuration interfaces. Keep the external cable interface away from sensitive analog circuitry and include overvoltage protection where the port is accessible to users.
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Point-to-Point Communication Link
The MAX232ESE+ supports a point-to-point RS-232 link between two systems using the EIA/TIA-232E interface and a maximum supported data rate of 120 kbps. Its CMOS transmitter inputs and receiver outputs let digital controller logic connect directly through the IC, while the on-chip charge-pump network supports the bipolar voltage levels required at the line interface. The design should follow the manufacturer’s recommended capacitor connections and account for line capacitance, cable length, grounding, and ESD protection. This application is best suited to legacy equipment rather than high-speed contemporary serial links.
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推薦產品摘要
工程參考資料，適用於 MAX232ESE+ — 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 | MAX232ESE+T | MAX232CSE+ | MAX232IN | SP232ACP-L | MAX232DR |
|---|---|---|---|---|---|---|
| Package | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Sipex | Maxim Integrated |
| Transmitter Channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels |
| Receiver Channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels |
| Technology | CMOS | CMOS | CMOS | CMOS | CMOS | CMOS |
| Temperature Grade Suffix | E | E | C | I | Industrial grade designation | D |
主要差異化特點
- Direct single-supply RS-232 interface (對比SP232ACP-L)
- Up to 120 kbps operation (對比MAX232IN)
- Established Maxim Integrated MAX232 family (對比SP232ACP-L)
設計說明
Follow the manufacturer recommended charge-pump capacitor and bypass-capacitor connections exactly. Place the charge-pump capacitors close to their dedicated pins, provide a short return path to ground, and avoid routing those switching nodes beneath or parallel to sensitive analog signals. The MAX232ESE+ generates bipolar line voltage internally, so careless layout can couple charge-pump noise into adjacent circuitry even when the communication signal itself is clean.
Do not assume that every MAX232 suffix is an exact production equivalent. MAX232ESE+T retains the same 16-SOIC electrical concept but changes the ordering or packing notation, while MAX232CSE+, MAX232IN, and MAX232DR use different grade codes. Before substitution, verify the package drawing, temperature range, lifecycle status, shutdown pin behavior, logic thresholds, and external capacitor values against the schematic and the current manufacturer datasheet.
Keep the logic-side traces away from the RS-232 connector and charge-pump section, and route the cable-side return with a short, low-impedance ground path. If the connector is user accessible, add appropriately rated ESD and surge protection close to the connector. Protection components must not interfere with receiver thresholds or the 120 kbps operating limit.
合規資訊
The interface IC is not an automotive-qualified power device, so AEC-Q100 is not applicable. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status were not explicitly identified in the cited product information and remain unknown.