MAX3221CPW - 250kbps Single-Channel RS-232 Transceiver | TI
MPN： MAX3221CPW ✓ 啟用中MAX3221CPW 概覽
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.
直接替換替代品，適用於 MAX3221CPW — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
MAX3221CPWRG4
✅ 直接替換📋 參考替代品（不在目錄中）
MAX3221ECPWRG4
✅ 直接替換📋 參考替代品（不在目錄中）
MAX3221ECPW
✅ 直接替換📋 參考替代品（不在目錄中）
MAX3221EUE
✅ 直接替換📋 參考替代品（不在目錄中）
MAX3221CPW 規格
| 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 |
| 封裝 | TSSOP-16 |
| 安裝類型 | Surface mount |
MAX3221CPW tssop-16 腳位配置指南
MAX3221CPW（tssop-16 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： MAX3221CPW.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX3221CPW 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 MAX3221CPW — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Single-channel RS-232 interface with integrated dual charge pump (對比MAX3232IPW)
- Low-power standby operation (對比MAX3221EUE)
- Single-supply operation across 3 V to 5.5 V (對比MAX3221ECPWRG4)
設計說明
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.
合規資訊
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.
