MAX3243CDB - 250kbps RS-232 Transceiver | Texas Instruments
料号： MAX3243CDB ✓ 量产中MAX3243CDB 概述
An RS-232 transceiver is an interface IC that converts logic-level signals into RS-232 line levels and converts received line-level signals back into digital logic. Within the semiconductor hierarchy, it belongs to the interface-controller and transceiver class, where it bridges computer or embedded-system logic and a physical communications port. The MAX3243 integrates bidirectional conversion, ESD protection, and power-management functions into one device, reducing the number of external interface components required.
The three drivers support three outbound RS-232 channels, while the five receivers support five inbound channels. This channel imbalance suits a DE-9 DTE interface because transmit, receive, and handshake signals do not use an equal number of conductors. Its operating range of 3 V to 5.5 V also supports both 3.3 V and 5 V system rails, while the 250 kbps maximum signaling rate accommodates legacy serial ports and moderate-speed industrial communication links.
The MAX3243 includes flexible automatic power-management features that can reduce supply consumption when unused. It also provides dedicated status outputs, including ROUT2B and INVALID, for monitoring ring indication and valid RS-232 input conditions. Pin-to-pin ESD protection is specified at ±15 kV under the HBM model, helping protect serial-port connections exposed to electrostatic discharge in industrial and desktop equipment.
Typical uses include PC-compatible serial ports, point-of-sale terminals, industrial serial controllers, security equipment, instrument interfaces, and embedded systems that exchange data over RS-232. The five receivers are useful when a design needs more incoming status signals than the three driver channels can support, while the dedicated status outputs simplify software-controlled modem and peripheral detection.
When implementing the MAX3243CDB, place input and output bypass capacitors close to the supply pins and route protected serial lines away from sensitive analog or high-speed digital traces. Confirm that the connector’s RS-232 voltage levels, ground reference, and signal directions agree with the three-driver, five-receiver configuration. Review the manufacturer pin-description table before assigning every net or connector lead.
This page consolidates the device’s operating limits, channel architecture, package details, sourcing guidance, and application-specific engineering guidance into a design-oriented reference for engineers evaluating the MAX3243CDB for compact single-supply RS-232 implementations.
直接替换替代料： MAX3243CDB ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
SP3243EBCA-L/TR
✅ 直接替换📋 参考替代料（不在目录中）
MAX3243CDB 规格参数
| Product Type | Multichannel RS-232 line driver/receiver |
| Supply Voltage Range | 3 V to 5.5 V |
| Maximum Data Rate | 250 kbps |
| Number of Line Drivers | 3 |
| Number of Line Receivers | 5 |
| ESD Protection | ±15 kV HBM |
| 封装 | 28-pin SSOP |
| 安装类型 | Surface mount |
| Interface Standard | RS-232 |
| Power Management | Automatic power-saving features |
| ROUT2B Output | Always enabled |
| INVALID Output | Always enabled |
| Typical Serial Interface | DE-9 DTE interface |
| Single-Supply Operation | Supported |
MAX3243CDB 28-pin ssop 引脚配置指南
MAX3243CDB（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： MAX3243CDB.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MAX3243CDB 适用于 6 应用s: PC-Compatible Serial Port, Industrial Serial Controller, Data-Acquisition Instrument, Point-of-Sale Terminal, Security and Access Equipment, Embedded Service Console.
PC-Compatible Serial Port
The MAX3243CDB fits a PC-compatible serial-port design because it combines three RS-232 drivers with five receivers and operates from 3 V to 5.5 V at up to 250 kbps. The mixed driver and receiver arrangement supports DE-9 DTE-style signal assignments without requiring several separate interface devices. Its always-enabled ROUT2B and INVALID outputs also help host software identify ring and input-valid conditions. The ±15 kV HBM protection rating strengthens a design where the connector is exposed to electrostatic discharge.
推荐
Industrial Serial Controller
The MAX3243CDB is suitable for industrial controllers that communicate through legacy RS-232 equipment while running from 3.3 V or 5 V logic. Its 250 kbps capability accommodates moderate-speed command and telemetry links, and the five receivers provide room for status or handshake inputs. Pin-to-pin ±15 kV HBM protection is valuable when the interface reaches an external panel through a long cable. Place the transceiver near the connector and route its protected pins directly to minimize ESD exposure along the board.
推荐
Data-Acquisition Instrument
The MAX3243CDB can connect laboratory or industrial data-acquisition equipment to a host computer through an RS-232 command port. The three transmitters carry commands and control signals, while five receivers accommodate acknowledgments, status lines, and external triggers. Operation from 3 V to 5.5 V supports embedded controllers that cannot tolerate a ±12 V transceiver supply. Its 250 kbps rate is appropriate for short configuration and telemetry transfers, although the complete protocol must include framing and flow control.
推荐
Point-of-Sale Terminal
The MAX3243CDB provides a practical interface between a point-of-sale controller and RS-232 peripherals such as scales, printers, or customer displays. Its 28-SSOP package preserves board area, while the three-driver and five-receiver arrangement supports mixed command and status wiring. The device accepts 3.3 V or 5 V rails, making it compatible with both legacy and current embedded controller platforms. Always-enabled INVALID and ROUT2B signals can help software track peripheral presence and incoming-data status without requiring separate logic.
推荐
Security and Access Equipment
The MAX3243CDB is appropriate for access-control panels and security equipment that retain an RS-232 service or configuration port. The 3 V to 5.5 V supply range supports compact embedded systems, while five receiver channels can monitor door, tamper, and communication-status inputs. The ±15 kV HBM protection provides a defined level of ESD robustness at the exposed connector. Signal routing should keep the protected transceiver pins near the connector and maintain a low-impedance chassis or board-ground path.
推荐
Embedded Service Console
The MAX3243CDB can provide a service and diagnostics channel in embedded equipment, using RS-232 for configuration downloads, log retrieval, and factory testing. Its 250 kbps maximum rate is sufficient for compact command protocols, and the compact 28-SSOP package supports space-constrained control boards. The five receivers can simplify monitoring of several service or peripheral signals, while three drivers handle outbound control traffic. The interface should include defined logic levels, startup behavior, and connector protection suitable for the target environment.
推荐
推荐产品汇总
工程参考数据： MAX3243CDB ——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 | SP3243EBCA-L/TR |
|---|---|---|
| Manufacturer | Texas Instruments | Exar |
| Package | 28-SSOP | 28-SSOP |
| Product Type | Multichannel RS-232 line driver/receiver | Multichannel RS-232 line driver/receiver |
| Supply Voltage Range | 3 V to 5.5 V | 3 V to 5.5 V |
| ESD Protection | ±15 kV HBM | ±15 kV IEC |
关键差异点
- Designed for DE-9 DTE signal allocation （对比 SP3243EBCA-L/TR)
- Defined HBM ESD protection （对比 SP3243EBCA-L/TR)
- Single-supply 3.3 V and 5 V operation （对比 SP3243EBCA-L/TR)
设计说明
Route the MAX3243CDB serial pins directly toward the RS-232 connector, keeping protected pins short and away from clocks, switching-regulator nodes, and sensitive analog inputs. Place the device near the connector entry point so electrostatic-discharge current has a short path to the protection structures and chassis or signal ground. Maintain a continuous ground reference between the transceiver and connector to avoid transferring discharge energy into unrelated system circuitry.
Follow the manufacturer datasheet for the exact input, output, and charge-pump capacitor values, tolerances, voltage ratings, and placement. Keep the required bypass capacitors close to their associated pins and provide short, low-inductance supply paths. The 3 V to 5.5 V operating range supports 3.3 V and 5 V rails, but capacitor selection must account for the actual rail, startup behavior, and permitted ripple rather than using a generic RS-232 network.
Do not infer the connector wiring from driver and receiver counts alone. Verify pin numbers, input and output directions, enable logic, ROUT2B behavior, INVALID operation, and ground assignments in the manufacturer pin-description table. The three-driver, five-receiver arrangement is suited to a DE-9 DTE-style interface, but naming conventions such as RIN, ROUT, DIN, and DOUT must be mapped to the exact package pinout before schematic capture.
Treat the RS-232 cable as a physically demanding, unbalanced interface and minimize connector stubs and unnecessary routing. Use the device’s specified driver and receiver characteristics when evaluating rise time, reflections, and baud-rate margin. The MAX3243CDB supports up to 250 kbps, but practical link reliability also depends on cable length, topology, grounding, protection components, and the signal-integrity behavior of the complete connected system.
合规信息
The manufacturer product page identifies ±15 kV HBM ESD protection. Specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals statements require confirmation from the product documentation.
