MAX3490EEPA+ - 12Mbps RS-485 Transceiver | Analog Devices
料号： MAX3490EEPA+ ✓ 量产中MAX3490EEPA+ 概述
An RS-485 transceiver is an interface IC that combines a differential line driver with a differential receiver, allowing information to be transmitted reliably over longer cable runs than a single-ended interface. The MAX3490EEPA+ belongs to the broader hierarchy of interface ICs, communication transceivers, physical-layer devices, and semiconductors. Its differential signaling supports noise-resistant communication between equipment located at different ground potentials.
The principal operating characteristics are a 3.3 V supply, a 12 Mbps maximum data rate, ±15 kV ESD protection, and slew-rate-limited outputs. The 12 Mbps capability permits the device to handle high-speed command, control, data, and instrumentation links. Slew-rate limiting reduces the high-frequency content of driver transitions, which helps limit electromagnetic interference and reduces the potential for reflections and data errors on suitable bus layouts.
This device supports both RS-485 and RS-422 communication modes. RS-485 is commonly used for multidrop buses connecting multiple nodes, while RS-422 is commonly used for point-to-point or limited-driver configurations. The MAX3490EEPA+ combines these functions in one transceiver package, allowing the same physical interface circuit to be configured according to the system’s grounding and bus topology.
Typical uses include industrial control systems, test and measurement equipment, building automation, data-acquisition units, motor-control systems, and industrial communications adapters. The 8-pin PDIP package is also convenient for prototyping and systems assembled through through-hole insertion rather than surface-mount automation.
PCB implementation should preserve the transceiver’s high-speed signal integrity. Route the differential bus as a closely coupled pair, terminate the line at appropriate physical endpoints, and avoid adding unnecessary stubs. Place the transceiver close to the connector and keep ground returns short. The manufacturer datasheet remains the controlling reference for pin assignments, supply decoupling, driver enable behavior, receiver enable behavior, and absolute maximum ratings.
This product page combines the exact manufacturer and distributor identifiers, separates functionally useful alternatives by package and data rate, and adds implementation guidance for evaluating the MAX3490EEPA+ in a new RS-485 or RS-422 design.
直接替换替代料： MAX3490EEPA+ ——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： MAX3490EEPA+ （相同外形与封装尺寸） ——差异在于 Package, Driver Output Type, Mounting Type, Product Type, Maximum Data Rate.
MAX3490CPA+
✅ 直接替换联系询价
查看数据手册 →MAX3490EPA+
✅ 直接替换联系询价
查看数据手册 →MAX3490EEPA+ 规格参数
| Product Type | RS-485/RS-422 transceiver |
| 电源电压 | 3.3 V |
| Maximum Data Rate | 12 Mbps |
| ESD Protection | ±15 kV |
| Supported Standards | RS-485, RS-422 |
| Driver Output Type | Slew-rate-limited |
| Transceiver Configuration | Full transceiver |
| 封装 | 8-PDIP |
| 引脚数量 | 8 pins |
| 安装类型 | Through-hole |
MAX3490EEPA+ 引脚配置
| 引脚 1 | [DATA_NEEDED: pin 1 name] — Use the manufacturer pin-description table for the MAX3490EEPA+ 8-PDIP package. |
| 引脚 2 | [DATA_NEEDED: pin 2 name] — Use the manufacturer pin-description table for the MAX3490EEPA+ 8-PDIP package. |
| 引脚 3 | [DATA_NEEDED: pin 3 name] — Use the manufacturer pin-description table for the MAX3490EEPA+ 8-PDIP package. |
| 引脚 4 | [DATA_NEEDED: pin 4 name] — Use the manufacturer pin-description table for the MAX3490EEPA+ 8-PDIP package. |
| 引脚 5 | [DATA_NEEDED: pin 5 name] — Use the manufacturer pin-description table for the MAX3490EEPA+ 8-PDIP package. |
| 引脚 6 | [DATA_NEEDED: pin 6 name] — Use the manufacturer pin-description table for the MAX3490EEPA+ 8-PDIP package. |
| 引脚 7 | [DATA_NEEDED: pin 7 name] — Use the manufacturer pin-description table for the MAX3490EEPA+ 8-PDIP package. |
| 引脚 8 | [DATA_NEEDED: pin 8 name] — Use the manufacturer pin-description table for the MAX3490EEPA+ 8-PDIP package. |
典型应用
MAX3490EEPA+ 适用于 6 应用s: Industrial Control Bus, Data Acquisition Equipment, Building Automation, Test and Measurement, Motor Control and Monitoring, Communication Equipment.
Industrial Control Bus
The MAX3490EEPA+ fits industrial control and factory-equipment links that use a 3.3 V RS-485 physical layer and require a data rate above 10 Mbps. Its 12 Mbps maximum rate provides timing margin for high-speed command and status traffic, while the slew-rate-limited differential outputs help reduce unwanted high-frequency content on the cable. The 8-PDIP package also simplifies through-hole prototypes and serviceable industrial controller assemblies. Engineers should keep the bus pair tightly routed, terminate it appropriately, and use the manufacturer pin and enable tables to configure driver and receiver operation for the selected bus topology.
推荐
Data Acquisition Equipment
The MAX3490EEPA+ is suitable for connecting laboratory, test, and data-acquisition equipment over an RS-485 bus. A 12 Mbps capability can shorten the time required to transfer sampled data and command packets, while ±15 kV ESD protection adds an important interface-level safeguard when cables connect external equipment. The differential driver and receiver support communication over cable runs where single-ended signaling would be more susceptible to noise. For reliable acquisition systems, use a controlled bus topology, place termination only where required, route the differential pair as a pair, and keep connector surge paths away from sensitive measurement circuitry.
推荐
Building Automation
The MAX3490EEPA+ can support 3.3 V RS-485 communication links in building-automation controllers, sensors, and gateway equipment. The 12 Mbps data rate is useful for compact systems that aggregate frequent telemetry, while slew-rate limiting helps control edge energy on installed wiring. The differential interface is appropriate for communications between equipment whose ground references may vary slightly because it rejects a common-mode voltage component within the receiver's specified operating range. Confirm that the temperature grade, isolation strategy, and installation surge requirements match the building environment before deploying the non-isolated interface.
推荐
Test and Measurement
The MAX3490EEPA+ fits test and measurement instruments that exchange commands and results over a short- or medium-length differential bus. Its 3.3 V supply supports integration with modern low-voltage logic, and the 12 Mbps rate provides sufficient bandwidth for automated test sequences and status reporting. The ±15 kV ESD rating is particularly relevant when users connect external test leads, but it does not replace correct cable treatment, grounding, and enclosure design. Place the transceiver near the external connector, provide the manufacturer-recommended bypass capacitance, and validate signal integrity with the intended cable length and terminations.
推荐
Motor Control and Monitoring
The MAX3490EEPA+ can be used for RS-485 command and monitoring links between a controller and motor-drive electronics. A 12 Mbps maximum rate allows rapid exchange of status, configuration, and diagnostic information, and the differential driver provides a robust physical layer for electrically separated equipment cabinets. Slew-rate-limited transitions assist with EMI control in systems containing high-power switching stages. The transceiver should remain separated from motor wiring, its supply should be referenced correctly to the control electronics, and the bus should avoid branching stubs that create reflections. Verify the exact enable configuration so the bus remains properly tri-stated when the driver is disabled.
推荐
Communication Equipment
The MAX3490EEPA+ is appropriate for compact RS-422 or RS-485 communication adapters that need high-speed differential signaling in an 8-pin PDIP package. The 12 Mbps rate supports high-throughput point-to-point RS-422 links and short multidrop RS-485 networks, while the 3.3 V supply simplifies integration with contemporary controller logic. The manufacturer documents this device as a true RS-485/RS-422 transceiver, so system designers can configure it for different driver and receiver enable states. Use controlled impedance routing, appropriate endpoint termination, and connector-side protection, and avoid relying on the transceiver's ESD rating as a substitute for an engineered surge-protection network.
推荐
推荐产品汇总
工程参考数据： MAX3490EEPA+ ——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 | MAX3490CPA+ | MAX3490EPA+ |
|---|---|---|---|
| Package | 8-PDIP | 8-PDIP | 8-PDIP |
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Maximum Data Rate | 12 Mbps | 10 Mbps | 10 Mbps |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V |
| Supported Interfaces | RS-485, RS-422 | RS-485, RS-422 | RS-485, RS-422 |
| Output Slew Rate | Slew-rate-limited | Slew-rate-limited | Slew-rate limit |
关键差异点
- Higher documented maximum data rate （对比 MAX3490CPA+)
- Higher documented maximum data rate （对比 MAX3490EPA+)
- Exact ESD-protection positioning in the product description （对比 MAX3490EPA+)
设计说明
Route the RS-485 and RS-422 differential signals as a tightly coupled pair, minimize the distance between the transceiver and connector, and avoid splitting the pair around other circuitry. Keep the ground return continuous and establish the interface ground reference deliberately. Stubs on a high-speed bus can act as discontinuities and create reflections, so connect only the intended nodes and place termination where the physical bus topology requires it.
Do not assume that identical PDIP outlines guarantee identical transceiver behavior. Before replacing MAX3490EEPA+ with MAX3490CPA+ or MAX3490EPA+, compare terminal assignments, driver-enable polarity, receiver-enable polarity, fail-safe behavior, supply limits, and temperature grade in the manufacturer datasheets. Both documented alternatives are rated at 10 Mbps rather than 12 Mbps, so links operating above that rate require additional timing margin and must not be substituted without validation.
Slew-rate limiting reduces edge-related electromagnetic interference, but layout and cable topology still determine real-world EMC performance. Keep external cable routing away from sensitive analog sections, use a controlled connector and cable design, and test radiated and conducted emissions under the intended system configuration. ESD protection should be combined with appropriate chassis grounding and surge-protection strategy rather than treated as the only defense against externally induced transients.
Place the device and its required bypass components close to the supply and ground terminals. Follow the manufacturer datasheet for capacitor values, placement, and exposed-pad or through-hole requirements; those values are not reproduced on this product page. During schematic capture, label both differential bus nodes distinctly, document the selected termination locations, and verify the package orientation mechanically before releasing the PCB artwork.
合规信息
No definitive compliance declarations are present in the manufacturer overview, distributor snippets, or indexed datasheet description. Confirm RoHS, REACH, lead-free, halogen-free, and conflict-minerals status using the current manufacturer product documentation or declaration before release to production.
