MAX3243ECAI+ - 3V/5V 250kbps RS-232 Transceiver
料号： MAX3243ECAI+ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.43 | $3.43 |
| 10 | $3.43 | $34.30 |
| 100 | $3.43 | $343.00 |
| 500 | $3.43 | $1,715.00 |
| 1,000 | $3.43 | $3,430.00 |
MAX3243ECAI+ 概述
An RS-232 transceiver is an interface IC that converts between digital logic-level signals and RS-232 voltage levels. The MAX3243 family belongs to the interface-IC hierarchy and is used where a UART or other digital controller must communicate with a PC, terminal, modem, or other RS-232 equipment. Its multiple drivers and receivers support both standard serial links and additional status or control signals.
Key features include automatic shutdown when no valid receiver signal is detected, automatic wakeup when a valid signal returns, and enhanced ESD protection. The manufacturer describes protection to ±15kV using the air-gap discharge test and ±8kV using the contact-discharge test. The available data also identifies the device as a 3/5 transceiver with a 250kbps data-rate capability.
The MAX3243E architecture is intended for low-power serial-interface systems. Automatic shutdown can reduce supply consumption when the RS-232 connection is idle, while wakeup allows the interface to reactivate without a continuously active supply state. The device is designed for 3V-powered equipment where RS-232 voltage generation and signal conditioning are required despite low logic supply voltage.
Typical applications include PC serial-port interfaces, industrial control equipment, data acquisition systems, point-of-sale terminals, and embedded serial adapters. The combination of multiple drivers, five receivers, automatic power management, and ESD protection supports both data transfer and hardware status signaling in compact embedded systems.
Designers should verify the exact pin assignments, external charge-pump capacitors, logic levels, and RS-232 line requirements against the manufacturer datasheet. PCB layout should keep the interface traces short, provide suitable return paths, and account for the elevated RS-232 voltage levels at the driver outputs.
直接替换替代料： MAX3243ECAI+ ——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： MAX3243ECAI+ （相同外形与封装尺寸） ——差异在于 Data Rate, Package.
快速对比工具——选择替代料号进行并排对比：
MAX3243CAI
✅ 直接替换📋 参考替代料（不在目录中）
ICL3243CAZ
✅ 直接替换📋 参考替代料（不在目录中）
ICL3243CAZ-T
✅ 直接替换📋 参考替代料（不在目录中）
MAX3243CAI+
✅ 直接替换📋 参考替代料（不在目录中）
MAX3243EAI
✅ 直接替换📋 参考替代料（不在目录中）
MAX3243ECAI+ 规格参数
| Product Type | 3/5 RS-232 transceiver |
| Supply Voltage Range | 3.0V to 5.5V |
| 数据速率 | 250kbps |
| Number of Drivers | 3 |
| Number of Receivers | 5 |
| Interface Standard | EIA/TIA-232 and V.28/V.24 |
| Automatic Shutdown | Yes |
| Automatic Wakeup | Yes |
| Air-Gap ESD Protection | ±15kV |
| Contact-Discharge ESD Protection | ±8kV |
| 封装 | 28-pin SSOP |
| 安装类型 | Surface mount |
| 电源电流 | 1µA shutdown feature described by manufacturer |
| Special Outputs | ROUT2B and INVALID always enabled |
| Compliance Status | RoHS and REACH status not stated in verified data |
MAX3243ECAI+ 28-pin ssop 引脚配置指南
MAX3243ECAI+（28-pin ssop 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： MAX3243ECAI+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MAX3243ECAI+ 适用于 8 应用s: DE-9 PC Serial Port, Embedded UART Serial Adapter, Industrial Data Acquisition, Point-of-Sale Terminal, Serial Port Test Equipment, Modem and Communication Equipment, Low-Power Serial Peripherals, RS-232 Port Expansion.
DE-9 PC Serial Port
MAX3243ECAI+ fits a DE-9 DTE interface because it provides three line drivers and five receivers, matching the multi-signal nature of a conventional PC serial connector. The 3.0V-to-5.5V supply range allows it to sit beside embedded UART logic without requiring a 5V-only interface. The verified Maxim Integrated description specifically identifies the device as ideal for DE-9 DTE applications. External charge-pump capacitors, connector protection, and signal routing must follow the datasheet reference layout.
推荐
Embedded UART Serial Adapter
MAX3243ECAI+ is suitable for an embedded controller that exposes a legacy RS-232 port through a UART. Its three drivers and five receivers provide more channels than a basic one-direction link, while automatic shutdown and wakeup can reduce power use when the cable is idle. The 250kbps capability supports higher-rate serial links than conventional low-speed RS-232 ports, although the complete UART, cable, and timing design must support that rate.
推荐
Industrial Data Acquisition
MAX3243ECAI+ can provide the RS-232 interface between a data-acquisition controller and a host computer or service terminal. Its 3V operation supports compact embedded systems, and the multiple drivers and receivers allow both command/data channels and status signaling to be managed in one package. The available verified data does not specify industrial temperature grades or isolation, so a product revision should be checked before using it in a harsh or safety-related environment.
推荐
Point-of-Sale Terminal
A point-of-sale terminal can use MAX3243ECAI+ to connect a low-voltage controller to an RS-232 receipt printer, scanner, or service interface. The 3.0V-to-5.5V supply range is useful in compact systems, while automatic shutdown helps avoid unnecessary supply activity when the serial link is idle. The ±15kV air-gap and ±8kV contact-discharge ratings add board-level transient protection, but cable shielding, grounding, and connector selection remain important parts of the overall system protection.
推荐
Serial Port Test Equipment
MAX3243ECAI+ is appropriate for test and measurement equipment that needs to present an RS-232-compatible port to a device under test. Three drivers and five receivers can support multiple handshake and status lines, while the 250kbps maximum data rate helps cover high-speed legacy serial test links. For laboratory use, verify the complete datasheet electrical characteristics, especially receiver thresholds, driver slew behavior, and supply-current conditions, because those details are not included in the supplied snippets.
推荐
Modem and Communication Equipment
MAX3243ECAI+ supports communication equipment requiring a multi-line RS-232 interface. The three drivers and five receivers provide flexibility for transmit, receive, modem-control, and status signals, while the EIA/TIA-232 and V.28/V.24 references align it with established serial-interface practice. Its low-voltage supply operation makes it useful in compact communication products. The designer must still verify line termination, connector signaling, and whether the 250kbps rate is acceptable for the target modem or cable.
推荐
Low-Power Serial Peripherals
MAX3243ECAI+ is useful in battery-operated or power-conscious serial peripherals because its verified product description includes approximately 1µA shutdown supply current and automatic wakeup. When no valid receiver signal is present, the interface can shut down its supply and drivers; when activity resumes, wakeup supports reactivation. Actual battery-life benefits depend on the system duty cycle, external capacitors, pull networks, and UART behavior, so the shutdown current should be verified under the intended test conditions.
推荐
RS-232 Port Expansion
MAX3243ECAI+ can expand a controller with one UART into a more capable RS-232 port by providing three transmit channels and five receive channels in one package. This allows data, flow-control, ring-indicator, and validity signals to share the same interface IC, reducing the number of separate level-shifting channels. The device's ROUT2B and INVALID outputs are always enabled according to the verified data, which is useful for monitoring link status. Final pin mapping and direction must be taken from the current manufacturer datasheet.
推荐
推荐产品汇总
工程参考数据： MAX3243ECAI+ ——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 | MAX3243CAI | ICL3243CAZ | ICL3243CAZ-T | MAX3243CAI+ | MAX3243EAI |
|---|---|---|---|---|---|---|
| Package | SSOP-28 | SSOP-28 | SSOP | SSOP | SSOP-28 | SSOP-28 |
| Brand | Maxim Integrated | Maxim Integrated | Intersil | Intersil | Maxim Integrated | Maxim Integrated |
| Automatic Shutdown and Wakeup | Yes | Not stated in verified comparison | Not stated in verified comparison | Not stated in verified comparison | Not stated in verified comparison | Not stated in verified comparison |
关键差异点
- High integration for multi-line RS-232 ports （对比 MAX3243CAI)
- Automatic power management （对比 MAX3243CAI)
- ESD protection for external serial lines （对比 MAX3243CAI)
设计说明
Place the MAX3243ECAI+ charge-pump capacitors and the RS-232 connector-side protection components close to the IC and connector exactly as shown in the manufacturer layout guidance. Keep the high-voltage RS-232 traces away from UART, clock, and sensitive analog nets. The supplied data confirms the 28-pin SSOP package and 3.0V-to-5.5V operating range, but the exact capacitor values and pin names must be taken from the current datasheet.
Design the supply rail for the 3.0V-to-5.5V operating range and account for the charge-pump and driver current demanded by the RS-232 outputs. Do not assume that the approximately 1µA shutdown figure applies to active transmission; the manufacturer data describes it in conjunction with automatic shutdown. Check the current under the intended load and ensure the source can handle startup and cable-driver transients.
Do not treat an SSOP-28 package match as sufficient proof of interchangeability. Confirm the numbered pins, supply range, receiver thresholds, driver outputs, AutoShutdown behavior, INVALID output, and ROUT2B output for any replacement. The verified cross-reference material supports MAX3243CAI and ICL3243CAZ as candidates, but it does not provide complete electrical tables for every suffix.
RS-232 drivers intentionally produce large voltage swings, so keep the interface path compact and provide a solid ground reference. Use cable shielding and connector grounding appropriate to the installation rather than relying only on the IC's ±15kV air-gap and ±8kV contact-discharge ratings. Validate conducted and radiated emissions with the final enclosure, cable, and load configuration.
合规信息
The verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for MAX3243ECAI+.