MAX222CN - 5V Dual RS-232 Transceiver | Texas Instruments
料号： MAX222CN ✗ 停产MAX222CN 概述
An RS-232 transceiver is an interface IC that combines differential line-driver and receiver functions into a system-facing serial port. Its hierarchy is transceiver > RS-232 interface > line driver/receiver > semiconductor. The MAX222CN translates logic-level signals between a host UART and RS-232 line drivers, while its receivers convert incoming RS-232 levels into CMOS-compatible digital signals. The integrated dual-channel arrangement reduces the component count for two-wire, full-duplex RS-232 communication.
Key verified features include a 5 V VCC supply, operation to 200 kbit/s, ±15 kV human-body-model ESD protection, low shutdown supply current, and external-capacitor charge-pump operation using 0.1 µF. The listed standards claim compliance with or exceedance of TIA/EIA-232-F and ITU V.28 requirements. Its 18-pin PDIP package supports through-hole PCB assembly rather than compact surface-mount layouts.
The MAX222CN is a legacy RS-232 interface, not an RS-485 transceiver and not a modern USB-to-serial converter. Its receiver hysteresis and supply range are listed in distributor data, while the complete electrical limits should be checked in the manufacturer datasheet before using the part outside the stated conditions. The dual drivers and receivers support point-to-point RS-232 links, instrumentation connections, and embedded systems that already expose a UART.
Typical uses include industrial control consoles, test equipment, serial adapters, and legacy peripheral interconnects. The principal design consideration is that RS-232 is a single-ended, unbalanced interface intended for shorter distances than differential buses. Designers should use suitable protection, grounding, and cable practices, and should not treat ±15 kV ESD protection as a substitute for external surge or lightning protection.
This page consolidates the verified distributor descriptions, package information, RS-232 capability, and cross-reference research for MAX222CN. It does not invent electrical limits, pricing, or pin assignments that were not supplied in the verified data.
直接替换替代料： MAX222CN ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
MAX222CPA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX222CSA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX222ESA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX222CN 规格参数
| Product Type | Dual RS-232 line driver/receiver |
| 电源电压 | 4.5 V to 5.5 V |
| Nominal VCC | 5 V |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Duplex | Full |
| Protocol | RS-232 |
| Maximum Data Rate | 200 kbit/s |
| ESD Protection | ±15 kV human-body model |
| Receiver Hysteresis | 500 mV |
| 工作温度 | 0 °C to 70 °C |
| Shutdown Supply Current | 2 µA typical |
| External Capacitors | 0.1 µF |
| 封装 | 18-pin PDIP, 0.300 inch pitch |
| 安装类型 | Through hole |
| Standards Claim | TIA/EIA-232-F and ITU V.28 requirements |
| RoHS 状态 | unknown |
| REACH Status | unknown |
MAX222CN 18-pin pdip, 0.300 inch pitch 引脚配置指南
MAX222CN（18-pin pdip, 0.300 inch pitch 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： MAX222CN.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MAX222CN 适用于 6 应用s: Industrial UART Control Console, Legacy Test and Measurement Equipment, Serial Adapter Embedded in Industrial Products, Point-to-Point Equipment Link, Instrumentation and Data Logger Retrofit, Legacy Peripheral Communication.
Industrial UART Control Console
The MAX222CN fits legacy industrial control systems where a host UART must connect to an RS-232 service port. Its two drivers and two receivers provide a full-duplex interface in one 18-pin PDIP device, while the verified 200 kbit/s capability is more than adequate for many low-speed configuration links. The 4.5 V to 5.5 V supply range and 0 °C to 70 °C specification suit equipment where the existing design already uses these limits. The transmitter and receiver paths still require correct RS-232 voltage levels, grounding, and cable protection; the device is intended for a point-to-point RS-232 connection, not an RS-485 multidrop bus.
推荐
Legacy Test and Measurement Equipment
The MAX222CN can serve as the serial communication interface in older test instruments that expose a UART through an RS-232 port. The dual-channel arrangement reduces the number of separate driver and receiver packages, and the verified 200 kbit/s rate supports many command and measurement-data transfers. Its 18-pin PDIP package is useful when maintaining a through-hole instrument design rather than redesigning for surface mount. The obsolete lifecycle status makes this choice primarily appropriate for repair, preservation, or already-qualified equipment. Engineers should verify the complete pinout and electrical limits from the manufacturer datasheet before adapting it to a new front panel or fixture.
推荐
Serial Adapter Embedded in Industrial Products
For an embedded product that must communicate with a legacy RS-232 peripheral, the MAX222CN provides a dedicated hardware interface between digital logic and the physical RS-232 line. The verified 2/2 driver-receiver arrangement supports simultaneous transmit and receive paths, while ±15 kV human-body-model ESD protection adds useful static-discharge robustness. The 5 V supply and 18-pin PDIP outline are compatible with designs already planned around that footprint. However, the designer must confirm logic levels, pin names, and shutdown behavior, and must add suitable protection when the cable leaves an enclosure. It should not be used as a substitute for an RS-485 physical layer.
推荐
Point-to-Point Equipment Link
The MAX222CN is appropriate for a short, point-to-point RS-232 link between two legacy pieces of equipment, such as a controller and a service module. Its full-duplex organization allows the two channels to support a bidirectional command path without requiring separate line-driver and line-receiver packages. The verified maximum rate of 200 kbit/s should be checked against the slower endpoint and cable capacitance, while the 0 °C to 70 °C range limits use in extended-temperature environments. Because RS-232 is single-ended and susceptible to ground-potential problems, use a defined common reference and appropriate cable routing. The device's ESD rating helps with static events but is not a complete industrial surge-protection solution.
推荐
Instrumentation and Data Logger Retrofit
A MAX222CN retrofit can add or restore RS-232 communications to an instrumentation or data-logger assembly that already uses a 5 V logic rail and through-hole PCB layout. The dual driver/receiver configuration provides the physical-layer conversion required by a UART, and the verified 200 kbit/s capability is useful for periodic status and measurement packets. The obsolete part status means the retrofit should be treated as a controlled maintenance action rather than a new production commitment. Confirm the 18-pin pinout, external charge-pump capacitors, receiver thresholds, and shutdown requirements against the datasheet. Keep cable routing away from motors, switching supplies, and high-current conductors to reduce noise pickup.
推荐
Legacy Peripheral Communication
The MAX222CN can be used in legacy peripheral interfaces where a computer, programmer, or service tool communicates through RS-232. Its two drivers and two receivers make it convenient for bidirectional equipment protocols, and its stated 200 kbit/s maximum rate is suitable for many low-bandwidth command interfaces. The 18-pin PDIP package is particularly relevant when preserving an existing through-hole board rather than changing its mechanical footprint. Before ordering, confirm that the exact suffix is still available and that no substitute changes the pinout or temperature grade. For new designs, compare a currently supported transceiver because the MAX222CN is listed as obsolete and long-term supply should not be assumed.
推荐
推荐产品汇总
工程参考数据： MAX222CN ——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 | MAX222CPA | MAX222CSA | MAX222ESA |
|---|---|---|---|---|
| Product Type | Dual RS-232 line driver/receiver | MAX222 family dual RS-232 interface | MAX222 family dual RS-232 interface | MAX222 family dual RS-232 interface |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 18-pin PDIP, through hole | PDIP-18 | SO-18 | SO-18 |
关键差异点
- Verified dual RS-232 channel arrangement （对比 MAX222CPA)
- 200 kbit/s operation （对比 MAX222CSA)
- Static-discharge protection （对比 MAX222ESA)
设计说明
Do not approve a replacement based only on the words RS-232 transceiver. The exact MAX222CN suffix uses an 18-pin PDIP footprint, while other MAX222 variants may use SO-18 or different temperature grades. Verify pin numbering, driver and receiver enable/shutdown behavior, supply limits, external capacitor requirements, and package drawing against the manufacturer datasheet before a substitution is treated as drop-in.
The verified MAX222CN specification identifies a 4.5 V to 5.5 V operating supply and 2 µA typical shutdown supply current. The interface still requires a stable 5 V rail, correct bypass capacitors, and the external charge-pump capacitors specified by the manufacturer. Do not assume the shutdown-current figure describes operating consumption; obtain the full load-current and quiescent-current limits from the datasheet before sizing the power tree.
Place the MAX222CN interface IC and its required external capacitors close to the associated RS-232 connector and logic device. Keep transmit and receive traces away from noisy switching nodes and preserve the intended ground-reference path. Because the supplied pinout is incomplete, use the manufacturer package and pinout diagrams rather than inferring connections from the 18-pin package drawing.
RS-232 is a single-ended interface, so cable routing, grounding, and protection matter as much as the nominal 200 kbit/s capability. Keep the interface cable away from motors, relays, and high-current power wiring, and validate the completed link with the slowest connected UART and the intended cable. The stated ±15 kV human-body-model ESD rating addresses static events but does not eliminate the need for external surge protection in industrial environments.
合规信息
The supplied verified data does not state RoHS, REACH, lead-free, halogen-free, conflict-mineral, or automotive qualification status. The part is an RS-232 interface IC; automotive qualification is therefore recorded as not_applicable only from the provided product classification, not as an AEC-Q100 claim.
