MAX3490CSA+ - 3.3V 10Mbps RS-422/RS-485 | Analog Devices
料号： MAX3490CSA+ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.35 | $3.35 |
| 10 | $3.35 | $33.50 |
| 100 | $3.35 | $335.00 |
| 500 | $3.35 | $1,675.00 |
| 1,000 | $3.35 | $3,350.00 |
MAX3490CSA+ 概述
An RS-422/RS-485 transceiver is an interface IC that converts between logic-level digital signals and balanced differential signals on a communication bus. RS-422 commonly supports point-to-point, full-duplex links, while RS-485 commonly supports multipoint, half-duplex networks. The MAX3490 combines both interface standards in one device, with separate driver and receiver sections and direction control handled by the host logic.
The MAX3490CSA+ is identified as a 3.3V-powered, 10Mbps, slew-rate-limited, true RS-485/RS-422 transceiver. Its low-power 3.3V operation suits modern controller platforms and reduces supply demand compared with legacy 5V interface designs. The 10Mbps capability makes it relevant for factory equipment, data acquisition, industrial controllers, and other systems requiring a higher-speed differential serial interface.
The device uses one driver and one receiver, allowing a compact implementation of a full-duplex RS-422 connection or a half-duplex RS-485 connection with external direction control. Differential signaling improves noise immunity over single-ended links and helps support reliable communication over longer cables when the bus is properly terminated and laid out.
For RS-485 networks, place termination resistors at the physical ends of the bus, bias the idle differential state appropriately, and keep transceiver stub branches short. For RS-422 links, use the receiver and driver pins associated with the intended full-duplex topology and confirm the manufacturer pin configuration before PCB release.
Designers should verify supply voltage, driver enable polarity, receiver enable polarity, common-mode limits, cable length, termination, and transceiver direction timing against the MAX3490 datasheet. This page combines verified manufacturer and distributor information, commercial sourcing context, and practical interface-design guidance for evaluating the MAX3490CSA+.
直接替换替代料： MAX3490CSA+ ——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： MAX3490CSA+ （相同外形与封装尺寸） ——差异在于 Mounting Type, Package.
快速对比工具——选择替代料号进行并排对比：
MAX3483
✅ 直接替换📋 参考替代料（不在目录中）
SN75176
✅ 直接替换✓ 有现货
$0.55 / 个
查看数据手册 →LT1785
✅ 直接替换📋 参考替代料（不在目录中）
ADM3483
✅ 直接替换📋 参考替代料（不在目录中）
MAX3491EESD+
✅ 直接替换📋 参考替代料（不在目录中）
MAX3490CSA+ 规格参数
| Product Type | RS-422/RS-485 interface transceiver |
| 电源电压 | 3.3 V |
| 数据速率 | 10 Mbps |
| Driver Count | 1 |
| Receiver Count | 1 |
| Supported Standards | RS-422 and RS-485 |
| Driver Type | Slew-rate-limited true RS-485/RS-422 driver |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface Mount |
| Communication Mode | Differential |
| Network Capability | RS-422 point-to-point and RS-485 multipoint |
| Termination | External network termination required for RS-485 applications |
| AEC-Q100 Qualification | not_applicable |
MAX3490CSA+ 引脚配置
| 引脚 1 | [DATA_NEEDED: pin 1 name] — Not provided in the verified web snippets; confirm from the MAX3490 manufacturer datasheet. |
| 引脚 2 | [DATA_NEEDED: pin 2 name] — Not provided in the verified web snippets; confirm from the MAX3490 manufacturer datasheet. |
| 引脚 3 | [DATA_NEEDED: pin 3 name] — Not provided in the verified web snippets; confirm from the MAX3490 manufacturer datasheet. |
| 引脚 4 | [DATA_NEEDED: pin 4 name] — Not provided in the verified web snippets; confirm from the MAX3490 manufacturer datasheet. |
| 引脚 5 | [DATA_NEEDED: pin 5 name] — Not provided in the verified web snippets; confirm from the MAX3490 manufacturer datasheet. |
| 引脚 6 | [DATA_NEEDED: pin 6 name] — Not provided in the verified web snippets; confirm from the MAX3490 manufacturer datasheet. |
| 引脚 7 | [DATA_NEEDED: pin 7 name] — Not provided in the verified web snippets; confirm from the MAX3490 manufacturer datasheet. |
| 引脚 8 | [DATA_NEEDED: pin 8 name] — Not provided in the verified web snippets; confirm from the MAX3490 manufacturer datasheet. |
典型应用
MAX3490CSA+ 适用于 7 应用s: Industrial RS-485 Control Bus, Data Acquisition Systems, Full-Duplex RS-422 Links, Instrumentation and Test Equipment, Embedded Serial Communication, Factory Automation Network, High-Speed Differential Data Links.
Industrial RS-485 Control Bus
The MAX3490CSA+ fits a 3.3V industrial controller that must communicate with remote sensors, actuators, or PLC modules over a differential bus. Its verified 10Mbps capability supports higher-speed control and diagnostic traffic, while the slew-rate-limited driver helps reduce unwanted reflections on imperfectly terminated cables. The single driver and receiver support a half-duplex bus when direction control is added externally. Designers should place termination at the bus endpoints, provide biasing for the idle state, and route the pair over a continuous ground reference. The 8-pin SOIC package keeps the interface compact, but enable polarity and exact receiver thresholds must be verified from the manufacturer datasheet.
推荐
Data Acquisition Systems
The MAX3490CSA+ can connect a controller to external measurement or instrumentation equipment where noise immunity and high-speed differential signaling are important. A 10Mbps-rated interface can transfer sampled data, configuration commands, and status information over a balanced cable rather than a long single-ended connection. The transceiver should be positioned near the cable entry, with short stubs and controlled return-path geometry. Termination and common-mode behavior depend on the cable and system grounding, so the final network must be checked with the intended node count and line length. The exact receiver sensitivity and common-mode limits are not included in the supplied verified snippets and should be confirmed in the official datasheet.
推荐
Full-Duplex RS-422 Links
The MAX3490CSA+ is suitable for a point-to-point full-duplex RS-422 link because it contains one driver and one receiver in a compact 8-pin SOIC package. The 3.3V operating point aligns with modern embedded systems, and the verified 10Mbps rating provides headroom for high-speed command or telemetry links. In a full-duplex arrangement, the transmit and receive differential pairs are separate, so the interface can operate in both directions without electrically sharing a single half-duplex bus pair. Cable routing should preserve differential impedance and minimize discontinuities. Verify the exact pin assignment, common-mode range, and receive thresholds in the manufacturer data sheet before finalizing the board.
推荐
Instrumentation and Test Equipment
The MAX3490CSA+ can be used in test and measurement equipment to connect a controller to remote fixtures, probes, or automated test stations over a differential link. Its verified 10Mbps capability is useful when the system exchanges measurement results, calibration commands, or diagnostic records rather than only slow set-point data. The transceiver’s slew-rate-limited signaling can help control edge energy on the cable, but it does not eliminate the need for correct termination and layout. Keep the differential traces away from clock, switching-regulator, and high-current return paths. Use the SOIC thermal and copper layout recommendations from the datasheet, especially when the interface operates continuously at high data activity.
推荐
Embedded Serial Communication
The MAX3490CSA+ is appropriate for embedded controllers that need an RS-422 or RS-485 port while operating from a 3.3V rail. The verified one-driver, one-receiver arrangement supports both point-to-point and multidrop interface architectures, and the 10Mbps capability can serve high-speed telemetry or factory communication. A microcontroller or FPGA can control driver and receiver enables, but the external timing and direction logic must match the MAX3490 pin functions. Keep the connector-side protection and differential routing compact, and confirm whether the application requires fail-safe receiver behavior, isolated grounding, or surge protection beyond the transceiver’s specified ratings. Those protection requirements are not supplied in the verified data and must be reviewed separately.
推荐
Factory Automation Network
The MAX3490CSA+ can support a factory automation network connecting a controller to motor-control, sensor, or remote I/O equipment. Its differential interface helps reject common-mode noise encountered in industrial environments, while the verified 3.3V supply and 10Mbps data rate align with modern embedded equipment. In a multidrop RS-485 network, only one driver should be active at a time, and the host must enforce driver-enable timing and bus turnaround. Add termination only at the two physical ends of the trunk and use bias resistors only where required by the network topology. The supplied information does not specify surge, isolation, or extended-cable ratings, so those requirements need separate validation.
推荐
High-Speed Differential Data Links
The MAX3490CSA+ can be evaluated for high-speed differential links where the verified 10Mbps rating is needed and the cable environment is controlled. Its slew-rate-limited driver is intended to reduce edge-related EMI and reflections, while the receiver provides a differential input for noise-tolerant communications. The device is not a universal solution for every 10Mbps cable: line length, connector geometry, impedance, termination, and grounding can determine whether the link closes reliably. Engineers should use controlled impedance routing, minimize connector transitions, and test with the actual cable and termination scheme. Exact timing and electrical limits should be taken from the official MAX3490 datasheet, not inferred from the product snippets.
推荐
推荐产品汇总
工程参考数据： MAX3490CSA+ ——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 | MAX3483 | SN75176 | LT1785 | ADM3483 |
|---|---|---|---|---|---|
| Interface | RS-422/RS-485 | RS-422/RS-485 | RS-485/RS-422 | RS-485/RS-422 | RS-485/RS-422 |
| Package | 8-pin SOIC | SOIC-8 family package | SOIC-8 family package | SOIC-8 family package | SOIC-8 family package |
| Brand | Analog Devices | Analog Devices | Texas Instruments | Analog Devices | Analog Devices |
| Application Class | Industrial and embedded differential communication | Low-speed RS-422/RS-485 communication | RS-485/RS-422 communication | Differential communication | RS-485/RS-422 communication |
关键差异点
- Higher verified data rate than MAX3483 （对比 MAX3483)
- Low-voltage 3.3V positioning （对比 SN75176)
- Slew-rate-limited differential interface （对比 ADM3483)
- Same 8-SOIC family footprint for upgrade review （对比 LT1785)
设计说明
Keep the RS-422 or RS-485 differential pair routed with tightly matched spacing and a continuous ground reference. Place the MAX3490CSA+ near the cable connector to minimize stub length and reduce sensitivity to reflections. For RS-485, terminate the bus at the two physical ends and verify the idle differential state with appropriate biasing. Do not treat the 10Mbps headline rate as a guarantee for every cable length or topology.
The verified snippets do not provide the complete MAX3490 pin functions, enable polarity, receiver thresholds, common-mode limits, or exact supply limits. Before releasing a PCB or substituting a device, compare the manufacturer pinout and timing diagrams against the existing design. Never assume that a similarly named RS-485 IC is pin-compatible even when both parts use an 8-pin SOIC package.
Separate the differential interface from noisy switching nodes and high-current return paths. Use short, direct copper connections from the transceiver to the connector, provide local ground-plane continuity, and route the pair away from clock and inductive power-conversion regions. If external protection is required, place it where the cable enters the board so surge current is diverted before reaching the transceiver.
The MAX3490 is described as slew-rate-limited, which can help reduce edge energy and reflections, but EMI control still depends on cable termination, connector shielding, and board layout. Avoid long parallel runs between the differential pair and unrelated high-speed traces. Confirm conducted and radiated emissions with the final enclosure, cable, grounding, and power-supply configuration rather than relying only on IC-level specifications.
合规信息
The supplied manufacturer and distributor snippets do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. Compliance should be confirmed from the current manufacturer product documentation or declaration.