ADM239LJR - 120 kB/s 5V RS-232 Interface | Analog Devices
MPN: ADM239LJR ✓ Hoạt độngADM239LJR Tóm tắt
An RS-232 interface transceiver is a physical-layer integrated circuit that converts logic-level signals into RS-232-compatible voltage levels and converts received RS-232 signals back into CMOS-compatible levels. The ADM239LJR belongs to the line-driver and line-receiver hierarchy, which falls within interface ICs and broader digital and analog semiconductors. Its integrated charge-pump DC-DC converters provide the voltage needed for bipolar RS-232 output drive without requiring a separate 12 V supply.
Key features include a single 5 V power supply, compliance with the EIA-232-E and V.28 specifications cited in the retrieved datasheet listing, a 120 kB/s data rate, and three drivers with five receivers. The on-board converters produce a 9 V output swing with a 5 V supply. Low-power shutdown reduces consumption when the interface is not needed, while 1 A receivers remain active during shutdown. The receiver input withstands voltages up to 30 V.
The device combines a multichannel RS-232 line interface with internal power-conversion circuitry, reducing the number of external supply rails required by the board. Its CMOS implementation and specified 9 V swing target systems that must bridge short-distance, point-to-point serial links through single-ended RS-232. The combination of three drivers, five receivers, and shutdown behavior supports compact communications equipment where multiple serial lines and power conservation are important.
Typical uses include industrial serial-port adapters, data-acquisition equipment, point-of-sale terminals, embedded control consoles, and instrumentation requiring RS-232 connectivity from a 5 V system. A transmitter converts outgoing UART or peripheral logic into RS-232 levels, while the five receivers allow multiple incoming lines to be monitored. The 120 kB/s rate is suitable for many legacy serial-control and data-transfer tasks when paired with a compatible UART and protocol.
Designers should verify the external charge-pump capacitor values, UART signal levels, connector protection, and shutdown-state behavior against the Analog Devices datasheet before layout release. Keep RS-232 traces away from sensitive analog and high-speed digital paths, provide the specified bypass capacitance at the supply pins, and account for the 30 V receiver input limit when exposed to industrial wiring or ESD events.
This page consolidates the verified ADM239LJR features, current distributor pricing references, package information, application guidance, and a transparent assessment of available drop-in alternatives. It also distinguishes documented device capabilities from fields not supplied by the retrieved sources, preventing unverified electrical claims from being presented as manufacturer specifications.
Bộ thay thế dễ dàng lắp đặt cho ADM239LJR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Không có bộ thay thế dễ dàng lắp đặt sẵn có cho sản phẩm này.
Yêu cầu các bộ thay thếADM239LJR Thông số kỹ thuật
| Product Type | 5 V powered CMOS RS-232 drivers and receivers |
| Điện áp cung cấp | 5 V |
| Number of Transmitters | 3 |
| Number of Receivers | 5 |
| Maximum Data Rate | 120 kB/s |
| RS-232 Output Swing | 9 V with a 5 V supply |
| External Charge-Pump Capacitor | 1 µF |
| Receiver Input Voltage | 30 V |
| Shutdown Feature | Low-power shutdown with receivers active |
| Receiver Status During Shutdown | Active |
| Driver Output Type | CMOS RS-232 line driver |
| Receiver Output Type | CMOS RS-232 line receiver |
| DC-DC Converter | On-board |
| RS-232 Compliance | EIA-232-E and V.28 |
| Hộp | 24-pin SOIC wide |
| Package Family | SOIC-24 surface-mount package |
| Kiểu lắp đặt | Surface mount |
| Lead-Free Status | Lead-free |
Hướng dẫn cấu hình chân ADM239LJR soic-24 surface-mount package
Cấu hình chân cho ADM239LJR (soic-24 surface-mount package gói). Số thứ tự chân, chức năng và sơ đồ kết nối được xác định trong tài liệu thông số kỹ thuật của nhà sản xuất. Tham khảo nó để biết footprint và hướng dẫn hàn chính xác.
Không có dữ liệu chân cụ thể sẵn có cho ADM239LJR.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
ADM239LJR phù hợp cho 6 Áp dụngs: Industrial Serial-Port Adapters, Point-of-Sale Terminal Interfaces, Embedded Control Consoles, Data-Acquisition Equipment, Instrumentation and Test Equipment, Legacy Communication Gateways.
Industrial Serial-Port Adapters
The ADM239LJR fits legacy industrial serial-port adapters because it combines three RS-232 transmitters and five receivers with operation from a single 5 V rail. Its verified 120 kB/s data rate supports many controller, test-equipment, and data-acquisition links. The on-board DC-DC converters generate the listed 9 V output swing without a separate 12 V supply, reducing board complexity. Designers should still verify the exact UART baud-rate tolerance, pinout, capacitor network, and protection requirements before adapting an existing RS-232 design.
Được đề xuất
Point-of-Sale Terminal Interfaces
The ADM239LJR can support compact point-of-sale equipment that must communicate with legacy peripherals through RS-232. Three transmitters allow several outbound control paths, while five receivers permit monitoring of multiple device-status inputs. Its single 5 V supply and on-board converters simplify integration into systems that do not carry a separate 12 V rail. The 120 kB/s rate is appropriate for many configuration and transaction protocols, but the system integrator must confirm protocol timing, connector exposure, and shutdown behavior.
Được đề xuất
Embedded Control Consoles
The ADM239LJR is appropriate for embedded control consoles that need several legacy RS-232 links but only a 5 V power budget. Its three drivers and five receivers support command transmission and multiport status monitoring, while low-power shutdown can reduce consumption when the main link is inactive. Keeping receivers active during shutdown provides continued monitoring capability. A practical implementation should place the device near its DB9 or terminal connector, use the specified 1 µF charge-pump capacitors, and separate transceiver routing from sensitive analog circuitry.
Được đề xuất
Data-Acquisition Equipment
The ADM239LJR can bridge a 5 V data-acquisition controller to RS-232 instruments and legacy sensors. Its 120 kB/s data rate accommodates many measurement-control protocols, while three transmitters support command and trigger outputs and five receivers support status collection. The integrated DC-DC converters eliminate the need for a separate RS-232 supply rail, helping reduce board area. Designers should verify the instruments' logic levels, handshake timing, cable length, grounding method, and electrical protection before finalizing the interface.
Được đề xuất
Instrumentation and Test Equipment
The ADM239LJR fits 5 V instrumentation that retains RS-232 compatibility for service consoles and legacy test stations. A 120 kB/s interface rate is suitable for many configuration and diagnostic protocols, and the availability of five receivers allows multiple status signals to be observed. The low-power shutdown mode helps reduce consumption during idle test cycles while maintaining receiver monitoring. Accurate implementation depends on selecting the correct SOIC footprint, following the charge-pump capacitor layout, and accounting for connector-borne ESD and industrial transient exposure.
Được đề xuất
Legacy Communication Gateways
The ADM239LJR can be used in gateways that translate a modern 5 V controller into older RS-232 equipment. Multiple receivers help the gateway monitor connected-device status, while three drivers support downstream commands and configuration paths. Its on-board DC-DC converters and 9 V output swing reduce supply complexity, and the 120 kB/s rate supports many legacy control protocols. The gateway design should include verified RS-232 levels, appropriate connector protection, defined grounding, and a controlled shutdown sequence that preserves required monitoring receivers.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADM239LJR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
MAX232DR, MAX202IDR, and SP232ECT-L appear in the site MPN list, but the supplied verified data does not establish that any of them is pin-to-pin compatible with ADM239LJR. They are suitable for engineering comparison, not automatic substitution. A different manufacturer should replace the ADM239LJR only after its footprint, channel mapping, supply voltage, charge-pump requirements, output swing, shutdown behavior, data rate, and receiver tolerances have all been verified. Because no validated cross-brand drop-in part was found, a redesign should preserve the ADM239LJR footprint whenever its documented features meet the system requirements.
Ghi chú thiết kế
Use the ADM239LJR from a single 5 V supply and place the manufacturer's recommended bypass capacitance close to the supply pins. The on-board DC-DC converters create the RS-232 voltage swing, so routing and grounding should follow the datasheet's converter layout. Check supply current in both normal and shutdown states, and confirm the voltage at every charge-pump node before enabling full transmitter activity.
Keep the RS-232 driver outputs and receiver inputs away from sensitive analog inputs, oscillators, and high-speed clock traces. Route the interface toward the connector without sharing long paths with unrelated signals, and use a solid ground reference. Because the verified source identifies 1 µF charge-pump capacitors, their type, voltage rating, placement, and loop geometry must be copied from the manufacturer layout rather than selected from generic RS-232 guidance.
Do not treat the 30 V receiver input rating as permission for unlimited industrial cable exposure. Add the connector protection required by the final EMC and ESD environment, confirm the logic levels of attached UART devices, and validate shutdown polarity and receiver-active behavior in firmware. Also avoid assuming that a generic MAX232-family pinout is interchangeable; the ADM239LJR channel arrangement and board requirements must be checked against its own datasheet.
Thông tin tuân thủ
The Traco Semiconductor listing identifies the part as lead-free. The retrieved sources do not explicitly establish RoHS, REACH, halogen-free, conflict-minerals, or automotive qualification status. The EIA-232-E and V.28 references are interface specifications, not environmental compliance certifications.
