MAX3221CPW - 250kbps Single-Channel RS-232 Transceiver | TI
料号： MAX3221CPW ✓ 量产中MAX3221CPW 概述
An RS-232 transceiver is an interface IC that converts logic-level digital signals into RS-232 voltage levels and converts received RS-232 signals back into logic-level signals. The MAX3221 belongs to the RS-232 interface IC hierarchy, which includes line drivers, line receivers, and charge-pump-assisted transceivers used for serial communications equipment, industrial controls, instrumentation, and point-of-sale terminals. The dual charge-pump circuit generates the positive and negative voltage levels required by the RS-232 interface without requiring a separate negative supply.
The MAX3221 operates from 3 V to 5.5 V, accepts 5 V logic input with a 3.3 V supply, and supports data rates to 250 kbit/s. Its low standby current of 1 µA typical and use of external 0.1 µF capacitors help support compact, power-conscious interface designs. The dedicated receiver enable pin allows the receiver to be disabled when the host does not need to monitor the serial link.
The device meets TIA/EIA-232-F requirements and is also associated with ITU V.28 operation, providing a standard RS-232 electrical interface for asynchronous communication systems. The ±15 kV ESD protection is specified pin to pin, including the serial-port connection pins and ground. This protection helps improve system robustness when cables are exposed to electrostatic discharge during installation, servicing, or normal handling.
Typical uses include single-channel serial console links, industrial serial adapters, programmable instrument interfaces, barcode and point-of-sale equipment, and embedded systems that require one bidirectional RS-232 channel. The 250 kbit/s capability is appropriate for legacy serial peripherals and control links, while the 3 V to 5.5 V operating range supports both 3.3 V and 5 V system rails.
When laying out the circuit, place the charge-pump capacitors and the driver and receiver interface capacitors close to their associated pins, and route the RS-232 traces away from sensitive analog or high-speed digital signals. Confirm that the transceiver enable state matches the host controller’s serial-port requirements before relying on low-power standby operation.
This page combines the manufacturer’s RS-232 interface specifications with package and application guidance, verified comparison candidates, and practical design notes for engineers evaluating the MAX3221CPW in compact serial-interface designs.
直接替换替代料： MAX3221CPW ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
MAX3221CPWRG4
✅ 直接替换📋 参考替代料（不在目录中）
MAX3221ECPWRG4
✅ 直接替换📋 参考替代料（不在目录中）
MAX3221ECPW
✅ 直接替换📋 参考替代料（不在目录中）
MAX3221EUE
✅ 直接替换📋 参考替代料（不在目录中）
MAX3221CPW 规格参数
| Product Type | Single-channel RS-232 line driver/receiver |
| Supply Voltage Range | 3 V to 5.5 V |
| Maximum Data Rate | 250 kbit/s |
| ESD Protection | ±15 kV pin-to-pin |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Receiver Enable | Dedicated enable pin |
| Charge Pump | Dual charge-pump circuit |
| Low Standby Current | 1 µA typical |
| External Capacitor Value | 0.1 µF |
| Logic Input Compatibility | Accepts 5 V logic input with 3.3 V supply |
| RS-232 Standards | TIA/EIA-232-F; ITU V.28 |
| 封装 | TSSOP-16 |
| 安装类型 | Surface mount |
MAX3221CPW tssop-16 引脚配置指南
MAX3221CPW（tssop-16 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： MAX3221CPW.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MAX3221CPW 适用于 6 应用s: Industrial Serial Control Interface, Point-of-Sale Terminal Interface, Barcode Scanner Connectivity, Test and Measurement Console, Embedded Service and Configuration Port, Remote Sensor and Data Acquisition.
Industrial Serial Control Interface
The MAX3221CPW is appropriate for a single-wire-direction RS-232 control link in industrial equipment where the controller uses 3.3 V or 5 V logic. Its 250 kbit/s maximum data rate covers many legacy serial protocols, while the ±15 kV pin-to-pin ESD protection improves robustness at an exposed connector. The receiver enable pin lets the host place the receive path into a low-power state when communication is inactive. Place the 0.1 µF capacitors close to the device and verify the complete signal path against the manufacturer application circuit.
推荐
Point-of-Sale Terminal Interface
A MAX3221CPW can provide the RS-232 electrical interface between a point-of-sale terminal and a legacy peripheral that supports one full-duplex channel. The 3 V to 5.5 V supply range permits integration with modern embedded systems while retaining compatibility with 5 V logic. Its ±15 kV ESD protection is valuable when the serial cable is user-accessible, although the connector still needs appropriate chassis and enclosure grounding. The single-channel architecture keeps the interface simple when no additional RS-232 ports are required.
推荐
Barcode Scanner Connectivity
The MAX3221CPW is suitable for connecting an embedded controller to a barcode scanner or other serial peripheral operating at up to 250 kbit/s. The device converts the controller’s logic-level UART signals to RS-232 levels and receives the peripheral response through its dedicated receiver enable path. This makes it useful for compact retail, warehouse, and asset-tracking equipment where the scanner interface is exposed to cable-borne electrostatic discharge. Confirm the scanner’s logic level, connector wiring, and timing before laying out the board.
推荐
Test and Measurement Console
A MAX3221CPW can add a single RS-232 console port to a compact test instrument or measurement controller. Its 250 kbit/s capability is sufficient for many serial adapters, service consoles, and legacy instrument-control protocols. The 3 V to 5.5 V operating range allows the interface to share either a 3.3 V or 5 V rail, while the receiver enable function can reduce activity during idle periods. Designers should place the transceiver close to the connector and separate the interface return path from sensitive measurement circuitry.
推荐
Embedded Service and Configuration Port
The MAX3221CPW fits embedded systems that retain a service or configuration port for programming, diagnostics, or field support. Its low 1 µA typical standby current helps when the port is monitored intermittently, and the dedicated receiver enable pin provides a straightforward way to control the receive path. The 16-pin TSSOP package supports compact layouts, but the external charge-pump capacitors and RS-232 protection network require careful placement. Verify the host UART voltage levels and ensure the controller can tolerate the RS-232 signal levels during reset.
推荐
Remote Sensor and Data Acquisition
The MAX3221CPW can interface a remote sensor, data-acquisition module, or industrial controller that uses one RS-232 channel. The device’s 250 kbit/s rate is suitable for many legacy telemetry and configuration links, while its ±15 kV pin-to-pin ESD protection helps manage electrostatic discharge on external cabling. The single driver and single receiver support full-duplex communication when transmit and receive paths are both needed. Check the remote device’s protocol timing, cable length, grounding, and connector shielding during system design.
推荐
推荐产品汇总
工程参考数据： MAX3221CPW ——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 | MAX3221CPWRG4 | MAX3221ECPWRG4 | MAX3221ECPW | MAX3221EUE |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | TSSOP-16 | TSSOP-16 - same | TSSOP-16 - same | TSSOP-16 - same | TSSOP-16 - same |
| Product Type | Single-channel RS-232 transceiver | Single-channel RS-232 transceiver | Single-driver, single-receiver RS-232 transceiver | MAX3221E single-channel RS-232 transceiver | MAX3221E single-channel RS-232 transceiver |
| Driver and Receiver Count | 1 driver and 1 receiver | 1 driver and 1 receiver | 1 driver and 1 receiver | 1 driver and 1 receiver | 1 driver and 1 receiver |
| Receiver Enable | Dedicated enable pin | Dedicated enable pin | Dedicated enable pin | Dedicated enable pin | Dedicated enable pin |
| Charge-Pump Architecture | Dual charge-pump circuit | Dual charge-pump circuit | Dual charge-pump circuit | Dual charge-pump circuit | Dual charge-pump circuit |
关键差异点
- Single-channel RS-232 interface with integrated dual charge pump （对比 MAX3232IPW)
- Low-power standby operation （对比 MAX3221EUE)
- Single-supply operation across 3 V to 5.5 V （对比 MAX3221ECPWRG4)
设计说明
Place the 0.1 µF charge-pump and interface capacitors as close as practical to their associated MAX3221CPW pins. Keep the driver and receiver traces short, route the ground return with the corresponding signal path, and avoid placing sensitive measurement or clock traces directly beneath the RS-232 connector area. Follow the manufacturer application circuit when assigning the external capacitor network.
Do not treat the RS-232 driver output as a logic-level UART signal. The MAX3221CPW translates between the controller’s logic-level UART and the positive and negative RS-232 voltage levels. Confirm voltage levels, signal polarity, enable polarity, and connector wiring against the manufacturer datasheet. A logic-level UART connected directly to the RS-232 pins will not communicate with a conventional RS-232 receiver.
ESD protection helps withstand electrostatic discharge, but it does not replace correct cable and enclosure design. Keep exposed connector wiring away from sensitive analog and high-speed digital nodes, use a suitable chassis or signal-ground strategy, and verify the final interface against the system’s ESD and EMC test requirements. The ±15 kV figure is a device-level protection specification, not a system-level compliance claim.
合规信息
The verified MAX3221CPW listings identify the interface standards and ESD protection. RoHS, REACH, lead-free, halogen-free, and conflict-mineral status are not explicitly stated in the supplied product data and are therefore recorded as unknown.
