MAX3221CAE+ - 3 to 5.5V RS-232 Transceiver | Analog Devices
MPN： MAX3221CAE+ ✓ 啟用中MAX3221CAE+ 概覽
An RS-232 transceiver is an interface IC that combines a transmitter and receiver for communicating between a logic-level device and an RS-232 port. The transmitter converts low-voltage TTL or CMOS signals into RS-232 levels, while the receiver converts incoming RS-232 signals back into logic-compatible levels. The MAX3221 family belongs to the interface IC hierarchy and provides a practical way to bridge modern embedded systems with legacy RS-232 equipment.
The MAX3221CAE+ includes Maxim's AutoShutdown feature, allowing the on-board power supply and driver circuitry to shut down when the receiver does not detect a valid signal. According to the Analog Devices MAX3221 product page, the device operates from +3V to +5.5V and reaches a supply current of 1 µA. These characteristics are particularly valuable in battery-powered instruments where a permanently active RS-232 interface would increase standby power consumption.
The MAX3221 is a 1-driver/1-receiver 16-pin SSOP version of the 2-driver/2-receiver MAX3223. Its integrated RS-232 supply uses charge-pump circuitry to develop the voltage swing needed by the transmitter. The C designation denotes the family's capacitor configuration, while the E designation provides shutdown-control functionality. The A suffix identifies the package and temperature-related ordering configuration used in the MAX3221CAE+ ordering code.
Typical applications include battery-powered test equipment, handheld configuration tools, serial adapters, industrial instrumentation, point-of-sale equipment, and embedded systems that must communicate with a host computer through an RS-232 port. The 16-pin SSOP footprint is useful for compact designs, although engineers should verify connector protection, cable length, logic levels, and supply compatibility against the system requirements.
The principal design consideration is signal integrity. RS-232 is a single-ended, unbalanced interface, so cable routing and ground quality can materially affect noise immunity. Place the transceiver close to the interface connector, provide a low-impedance ground path, use suitable protection for exposed cables, and observe the manufacturer's recommended charge-pump capacitor values. External circuitry may also be required for hardware handshaking or for conditioning signals on long or electrically noisy cables.
This page organizes the MAX3221CAE+ specifications, application guidance, package information, and verified same-package alternatives into an engineering-focused reference. It also highlights the practical trade-offs among shutdown, supply-voltage, capacitance, and temperature variants so designers can make a replacement decision based on actual circuit requirements rather than package similarity alone.
直接替換替代品，適用於 MAX3221CAE+ — 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： MAX3221CAE+ （相同外形與佔位） — 差異在於 Package, Supply Voltage Range, AutoShutdown Supply Current, ESD Protection, Interface Standard.
MAX3221CAE-
✅ 直接替換📋 參考替代品（不在目錄中）
MAX3221ECAE+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX3221EEAE+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX3221EUE+
✅ 直接替換聯絡詢價
查看資料表 →ICL3221EIAZ
✅ 直接替換📋 參考替代品（不在目錄中）
MAX3221CAE+ 規格
| Product Type | RS-232 transceiver |
| Transceiver Configuration | 1 transmitter and 1 receiver |
| Supply Voltage Range | +3 V to +5.5 V |
| AutoShutdown Supply Current | 1 µA |
| 封裝 | 16-pin SSOP |
| 安裝類型 | Surface mount |
| Number of Drivers | 1 driver |
| Number of Receivers | 1 receiver |
| Interface Standard | RS-232 |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
| Lead-Free Status | unknown |
MAX3221CAE+ 16-pin ssop 腳位配置指南
MAX3221CAE+（16-pin ssop 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： MAX3221CAE+.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX3221CAE+ 適用於 6 應用s: Battery-Powered Test Instrument, Industrial Serial Adapter, Handheld Configuration Tool, Point-of-Sale Terminal, Data Acquisition Controller, Embedded Service Console.
Battery-Powered Test Instrument
The MAX3221CAE+ fits battery-powered test instruments that communicate with a host through RS-232. Its +3 V to +5.5 V supply range supports 3.3 V and 5 V portable systems, while the 1 µA AutoShutdown supply current reduces demand when no valid receiver signal is present. Place the transceiver near the serial connector, use the manufacturer-recommended charge-pump capacitors, and confirm that the host port uses compatible logic levels and signal polarity.
推薦
Industrial Serial Adapter
The MAX3221CAE+ is suitable for compact industrial serial adapters that bridge a modern embedded controller to an RS-232 equipment port. Its one-driver, one-receiver arrangement provides the required bidirectional signal path, and the 16-pin SSOP package limits board area. A production design should provide a low-impedance ground connection, route the interface away from switching nodes, and determine whether external overvoltage protection is required for the connected cable.
推薦
Handheld Configuration Tool
The MAX3221CAE+ supports handheld configuration tools that exchange setup commands with a host computer. The +3 V operating capability aligns with many portable embedded systems, and AutoShutdown can reduce standby consumption when the RS-232 connection is inactive. Validate the receiver thresholds and driver levels against the host interface, and include a stable reference ground to avoid interpreting ground offset as data corruption.
推薦
Point-of-Sale Terminal
The MAX3221CAE+ can provide legacy peripheral connectivity in a point-of-sale terminal that needs one RS-232 channel. The 16-pin SSOP package supports compact PCB layouts, and the +3 V to +5.5 V range accommodates common embedded supply rails. Because RS-232 is an unbalanced interface, keep the connector ground return short, separate it from motor and switching-power currents, and confirm whether the peripheral requires hardware handshake signals.
推薦
Data Acquisition Controller
The MAX3221CAE+ is appropriate for a data-acquisition controller that uses a host computer for configuration or data transfer. Its single transmitter and receiver cover a standard bidirectional RS-232 link, while the low shutdown current benefits systems that spend substantial time between host commands. Check the acquisition system’s baud-rate limit, handshake requirements, and cable length against the manufacturer specifications before finalizing the interface.
推薦
Embedded Service Console
The MAX3221CAE+ fits an embedded service console used for firmware loading, diagnostics, and field-service access. The 16-pin SSOP footprint leaves space for the rest of the controller, and the device accepts both 3.3 V and 5 V supply environments. Place the RS-232 circuitry near the connector, maintain continuous ground reference, and use the manufacturer-defined enable behavior to avoid unintended driver activity during system startup.
推薦
工程參考資料，適用於 MAX3221CAE+ — 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 | MAX3221CAE- | MAX3221ECAE+T | MAX3221EEAE+T | MAX3221EUE+ | ICL3221EIAZ |
|---|---|---|---|---|---|---|
| Package | 16-SSOP | 16-SSOP | 16-SSOP | 16-SSOP | 16-SSOP | 16-SSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Intersil |
| Transceiver Configuration | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver | 1 transmitter and 1 receiver |
| Interface Standard | RS-232 | RS-232 | RS-232 | RS-232 | RS-232 | RS-232 |
主要差異化特點
- Low-voltage operation with automatic power reduction (對比ICL3221EIAZ)
- Exact C-configuration family option (對比MAX3221EEAE+T)
- Direct manufacturer family continuity (對比MAX3221EUE+)
設計說明
Place the MAX3221CAE+ and its charge-pump capacitors close to the RS-232 connector. Keep the connector-side ground return short and connect it to a quiet ground plane, because RS-232 is an unbalanced interface and ground offset can distort valid data. Route the interface away from switching regulators, relays, motors, and high-current return paths to reduce common-mode interference.
Use the charge-pump capacitor values and layout specified in the manufacturer MAX3221 datasheet. Capacitor placement is part of the charge-pump design because incorrect values or long traces can alter startup behavior and driver performance. Confirm the system's minimum startup voltage, 3.3 V or 5 V supply tolerance, and AutoShutdown timing before finalizing the rail-selection components.
Treat the RS-232 connector as an exposed industrial interface. Determine whether the connected cable requires transient-voltage protection, series damping, or additional logic protection. Keep protection components close to the connector and outside the transceiver's normal operating signal path. Also verify whether the application requires hardware handshake signals beyond the one transmitter and one receiver provided by the MAX3221CAE+.
Do not assume that every MAX3221 order code is electrically identical. The C, E, A, U, and temperature-related suffixes can change charge-pump capacitance, enable behavior, or environmental qualification. For a replacement, compare the manufacturer pin descriptions, recommended capacitors, logic thresholds, enable polarity, and operating-temperature range rather than relying only on the shared SSOP-16 footprint.
合規資訊
The MAX3221 family is an RS-232 interface IC for industrial, commercial, and portable equipment rather than an automotive-qualified device. Specific RoHS, REACH, lead-free, and halogen-free declarations require confirmation from the applicable manufacturer product documentation.
