MAX3243CPW - 3-5.5V 250kbps RS-232 Transceiver | Texas Instruments
MPN： MAX3243CPW ✓ 啟用中MAX3243CPW 概覽
An RS-232 transceiver is an interface IC that converts logic-level signals into RS-232 line levels and converts received RS-232 signals back into digital logic levels. Within the interface hierarchy, the MAX3243CPW combines a line driver, line receiver, and charge-pump-assisted level-shifting functions. Its three-driver, five-receiver arrangement is particularly useful for DE-9-style data terminal equipment interfaces that need more receiver channels than transmitter channels.
The MAX3243 offers flexible power features that can reduce consumption automatically, helping equipment designers limit power use when communication activity is low. Two always-enabled outputs, ROUT2B and INVALID, support checking a ring indicator and determining whether received RS-232 data is valid. The 3 V to 5.5 V operating range allows the same interface circuit to operate from either 3.3 V or 5 V system rails.
Operation at up to 250 kbps makes the device suitable for moderate-speed serial data links rather than only slow legacy port traffic. Its ±15 kV HBM ESD protection adds system-level ruggedness at externally accessible RS-232 connectors, where cables and user equipment can introduce electrostatic discharge. Protection ratings should still be complemented by appropriate board-level grounding and cable-routing practices.
Typical uses include industrial serial consoles, data acquisition equipment, test and measurement instruments, embedded control systems, and legacy peripheral interfaces. The five receivers are useful when a system must monitor several RS-232 inputs, such as modem-control, status, ring, and data signals, while three drivers can handle transmit and control lines.
PCB design should reserve the 28-pin TSSOP footprint, connect all supply and ground pins as directed by the manufacturer, place charge-pump capacitors close to their associated pins, and route RS-232 connector traces away from sensitive logic. Confirm signal direction, receiver enable, shutdown, and always-enabled output behavior against the manufacturer pin description before finalizing the schematic.
This product guide consolidates the principal electrical ratings, package information, interface use cases, verified cross-references, and practical layout considerations into an engineer-focused reference for selecting and implementing the MAX3243CPW.
直接替換替代品，適用於 MAX3243CPW — 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： MAX3243CPW （相同外形與佔位） — 差異在於 ESD Protection, Number of Drivers, Number of Receivers, Supply Voltage Range.
MAX3243CUI+
✅ 直接替換聯絡詢價
查看資料表 →MAX3243CPW 規格
| Product Type | Multichannel RS-232 line driver and receiver |
| Supply Voltage Range | 3 V to 5.5 V |
| Maximum Data Rate | 250 kbps |
| Number of Drivers | 3 |
| Number of Receivers | 5 |
| ESD Protection | ±15 kV HBM |
| Protected Connections | Serial-port connection pins, including GND |
| Package Type | 28-pin TSSOP |
| 安裝類型 | Surface mount |
| Shutdown Control | Automatic power-saving feature |
| Always-Enabled Outputs | ROUT2B and INVALID |
| Driver Output Type | RS-232 line driver |
| Receiver Output Type | RS-232 line receiver |
MAX3243CPW 28-pin tssop 腳位配置指南
MAX3243CPW（28-pin tssop 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： MAX3243CPW.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX3243CPW 適用於 6 應用s: DE-9 Serial Console Interface, Industrial Data Acquisition, Test and Measurement Equipment, Embedded Controller Communication, Legacy Peripheral Connectivity, Security and Access-Control Terminals.
DE-9 Serial Console Interface
The MAX3243CPW fits a DE-9-style console because it combines three RS-232 drivers with five receivers, allowing data, status, ring, and control signals to be monitored through one interface IC. It operates from 3 V to 5.5 V at up to 250 kbps, so a single design can cover both 3.3 V and 5 V embedded platforms. The five receiver channels provide more observation points than the three transmit channels, while ROUT2B and INVALID remain available for ring and validity checks. Place the charge-pump capacitors and interface bypass capacitors close to the device, and route connector-side traces away from sensitive digital circuitry.
推薦
Industrial Data Acquisition
The MAX3243CPW is useful in industrial data-acquisition equipment that receives commands and reports equipment status over an RS-232 link. Its three drivers support outbound data and selected control signals, while five receivers can monitor several independently arriving lines. The 250 kbps rate is appropriate for configuration transfers, status polling, and moderate-rate telemetry rather than continuous high-bandwidth streaming. Its 3 V to 5.5 V supply range simplifies adaptation between 3.3 V controllers and legacy 5 V peripherals. The ±15 kV HBM rating adds protection at an externally accessible connector, although industrial enclosure grounding and signal isolation should be assessed separately.
推薦
Test and Measurement Equipment
Instrumentation systems commonly use RS-232 for legacy printer, calibrator, and service-port connections, making the MAX3243CPW a practical multi-channel interface device. Five receivers can monitor data and control inputs from an instrument, while three drivers provide outbound command or status paths. The maximum 250 kbps rate supports short control exchanges and moderate serial transfers. Because test equipment often connects to user-supplied cables, the device's ±15 kV HBM protection is especially relevant. Use the manufacturer pin and capacitor guidance, provide a stable reference ground, and place protection or isolation ahead of the IC when the external environment exceeds the device's operating limits.
推薦
Embedded Controller Communication
The MAX3243CPW connects a microcontroller or processor to legacy RS-232 equipment while operating from a 3.3 V or 5 V rail. Its 250 kbps maximum rate accommodates many command protocols, boot-loader messages, and configuration exchanges. The five-receiver configuration allows the controller to inspect modem-control, carrier, ring, and other status lines without requiring multiple interface packages. Always-enabled ROUT2B and INVALID outputs can be read by a general-purpose input pin for ring and data-validity detection. Designers should confirm logic compatibility at the receiver outputs and observe the required charge-pump capacitor layout to prevent unintended signal or supply noise.
推薦
Legacy Peripheral Connectivity
The MAX3243CPW provides a practical bridge between modern electronics and legacy RS-232 peripherals that retain DE-9-style connectors. It can drive three outbound lines and monitor five inbound lines, enabling control and status functions as well as data transfer. Its 3 V to 5.5 V operation supports integration into both legacy 5 V equipment and newer 3.3 V systems. The 250 kbps limit supports legacy peripheral traffic while exceeding the throughput needed for many command-and-control protocols. Protect the connector-side interface appropriately, keep ground return paths short, and verify whether the connected equipment uses hardware handshaking before assigning all available receiver inputs.
推薦
Security and Access-Control Terminals
Access-control terminals and security equipment can use the MAX3243CPW to maintain a wired RS-232 service or supervisory channel to a remote controller. Three drivers can carry configuration, command, or acknowledgment traffic, while five receivers provide access to status and handshake inputs. The 250 kbps data rate is suitable for supervisory events and short configuration transactions. Its ±15 kV HBM protection is useful where service cables connect to external equipment, though enclosure design and cable routing remain central to electrostatic-discharge control. Use a defined ground strategy, avoid routing connector traces beneath sensitive processor areas, and validate the logic levels of ROUT2B and INVALID in the target firmware.
推薦
推薦產品摘要
工程參考資料，適用於 MAX3243CPW — 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 | MAX3243CUI+ |
|---|---|---|
| Package | TSSOP-28 | TSSOP-28 |
| Brand | Texas Instruments | Texas Instruments |
| Supply Voltage Range | 3 V to 5.5 V | 3 V to 5.5 V |
| Maximum Data Rate | 250 kbps | 250 kbps |
| Automatic Power Features | Supported | AutoShutdown |
主要差異化特點
- Five receivers support more RS-232 input monitoring than a typical dual-channel interface (對比MAX3243CUI+)
- Wide compatibility with modern and legacy supply rails (對比MAX3243CUI+)
- Continuous status visibility through always-enabled outputs (對比MAX3243CUI+)
- ESD protection is specified at externally relevant connection pins (對比MAX3243CUI+)
設計說明
Place the charge-pump and bypass capacitors at the pins identified in the manufacturer datasheet, using the shortest practical traces. The MAX3243's internal charge pump creates the RS-232 voltage levels, so long capacitor connections can increase timing variation and radiated noise. Use a footprint and pin numbering that match the 28-pin TSSOP package exactly, and verify every receiver input and driver output direction in the schematic review.
Do not assign receiver inputs or driver outputs from connector labels alone. A DE-9 connector can expose data, modem-control, status, and ring signals with different directions at the DTE and DCE ends. Build the signal map from the MAX3243CPW pin description, the connected equipment documentation, and the intended DTE or DCE role. The ROUT2B and INVALID outputs remain enabled, but their usefulness still depends on correct receiver routing.
Route connector-side RS-232 traces away from clock, ADC, and sensitive control paths, and maintain a continuous return-ground path. The ±15 kV HBM component rating helps at the IC pins but does not guarantee immunity at the connector or enclosure entry point. Use appropriately rated grounding and protection measures at exposed connectors, especially when long cables connect the equipment to uncontrolled external hardware.
Provide the 3 V to 5.5 V supply within the limits stated by the manufacturer and decouple the device close to its supply pins. Because the device can enter automatic power-saving modes when communication activity is absent, verify that the selected mode does not delay receiver detection, ringing indication, or required periodic handshakes. Use the always-enabled ROUT2B and INVALID outputs when the host must observe status continuously.
合規資訊
The identified technical information confirms ±15 kV HBM ESD protection but does not state the regulatory compliance status of the MAX3243CPW ordering code.
