MAX211IDBR - 5V RS-232 Transceiver, 120kbps, ±15kV ESD | TI (Tape & Reel)
MPN： MAX211IDBR ✓ 啟用中MAX211IDBR 概覽
What is an RS-232 line driver/receiver? An RS-232 transceiver is an interface IC that translates between the low-voltage logic levels used by a UART or microcontroller (typically 0 V to 5 V or 3.3 V) and the higher-voltage bipolar signaling levels required by the legacy TIA/EIA-232-F standard (±5 V to ±15 V). It belongs to the broader family of line transceivers (interface ICs > drivers, receivers, transceivers) and acts as the electrical translator between an asynchronous communication controller and a DB-9 or DB-25 serial-port connector. The on-chip charge pump generates the bipolar rails from a single 5 V supply, eliminating the need for external ±12 V power.
Key features of the MAX211IDBR include integrated dual charge pump with four external 0.1 µF capacitors, ±15 kV ESD protection on serial-port connection pins (Human-Body Model per TIA/EIA-232-F requirements), four drivers and five receivers, true TTL/CMOS input compatibility on receiver inputs, and a low 1.5 mA typical supply current. The device operates from a single 5 V supply and requires no external ±12 V rails, simplifying industrial and embedded designs.
Internally the MAX211IDBR uses a switched-capacitor voltage converter (charge pump) to derive +10 V and -10 V from the 5 V input. These rails feed the drivers, allowing them to swing beyond the supply rails per RS-232 specifications. The drivers are inverting (true RS-232 inverters), while the receivers invert again so overall the data path is non-inverting between the UART TX/RX lines and the cable-side DTR/DSR/RTS/CTS/RI/DCD lines.
Typical applications include industrial PCs and point-of-sale terminals, serial-port debug consoles on embedded systems, legacy modem interfaces, factory automation controllers, and any system requiring TIA/EIA-232-F signaling from a single 5 V rail. When designing with this part, place the four charge-pump capacitors as close to the IC pins as possible and provide adequate ground plane beneath the SSOP-28 body to keep EMI and supply ripple low.
直接替換替代品，適用於 MAX211IDBR — 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。
此系列的變體
與下列產品可直接替換的同系列型號： MAX211IDBR （相同外形與佔位） — 差異在於 Package, Driver Output Swing, Operating Temperature Range, Product Type, RoHS Status.
MAX211CDB
✅ 直接替換聯絡詢價
查看資料表 →MAX211IDBG4
✅ 直接替換📋 參考替代品（不在目錄中）
MAX211IDW
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MAX211ECAI+
✅ 直接替換📋 參考替代品（不在目錄中）
ADM211ARSZ
✅ 直接替換📋 參考替代品（不在目錄中）
SP211EHCA-L/TR
✅ 直接替換📋 參考替代品（不在目錄中）
MAX211IDBR 規格
| Product Type | RS-232 Line Driver/Receiver (Transceiver) |
| Number of Drivers | 4 |
| Number of Receivers | 5 |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| Data Rate (Max) | 120 kbps |
| Driver Output Swing | ±9 V (typ) |
| ESD Protection (HBM, RS-232 pins) | ±15 kV |
| Supply Current (typ, no load) | 1.5 mA |
| 工作溫度範圍 | -40 °C to +85 °C |
| Charge Pump Caps | 4 external 0.1 µF |
| Receiver Input Threshold | 0.8 V (low) / 2.4 V (high) |
| Receiver Hysteresis | 0.5 V (typ) |
| 封裝 | SSOP-28 (DB) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Standards Compliance | TIA/EIA-232-F |
| Input Logic Compatibility | TTL/CMOS |
MAX211IDBR 腳位配置
| 腳位 1 | C2+ — Charge-pump flying capacitor 2 positive terminal |
| 腳位 2 | V+ — Charge-pump generated +10 V supply (driver side) |
| 腳位 3 | C1- — Charge-pump flying capacitor 1 negative terminal |
| 腳位 4 | C1+ — Charge-pump flying capacitor 1 positive terminal |
| 腳位 5 | C2- — Charge-pump flying capacitor 2 negative terminal |
| 腳位 6 | V- — Charge-pump generated -10 V supply (driver side) |
| 腳位 7 | DOUT1 — RS-232 driver output 1 |
| 腳位 8 | DOUT2 — RS-232 driver output 2 |
| 腳位 9 | DOUT3 — RS-232 driver output 3 |
| 腳位 10 | DIN1 — TTL/CMOS driver input 1 |
| 腳位 11 | DIN2 — TTL/CMOS driver input 2 |
| 腳位 12 | DIN3 — TTL/CMOS driver input 3 |
| 腳位 13 | DOUT4 — RS-232 driver output 4 |
| 腳位 14 | RIN1 — RS-232 receiver input 1 (cable side) |
| 腳位 15 | RIN2 — RS-232 receiver input 2 (cable side) |
| 腳位 16 | RIN3 — RS-232 receiver input 3 (cable side) |
| 腳位 17 | DOUT5 — RS-232 driver output 5 (used for fail-safe biasing on some variants) |
| 腳位 18 | RIN4 — RS-232 receiver input 4 (cable side) |
| 腳位 19 | ROUT5 — TTL/CMOS receiver output 5 |
| 腳位 20 | ROUT4 — TTL/CMOS receiver output 4 |
| 腳位 21 | RIN5 — RS-232 receiver input 5 (cable side) |
| 腳位 22 | DIN4 — TTL/CMOS driver input 4 |
| 腳位 23 | DIN5 — TTL/CMOS driver input 5 |
| 腳位 24 | VCC — +5 V supply input |
| 腳位 25 | GND — Ground |
| 腳位 26 | ROUT3 — TTL/CMOS receiver output 3 |
| 腳位 27 | ROUT2 — TTL/CMOS receiver output 2 |
| 腳位 28 | ROUT1 — TTL/CMOS receiver output 1 |
典型應用
MAX211IDBR 適用於 7 應用s: Industrial PLC Serial Port, Point-of-Sale Terminal, Embedded Serial Debug Console, Factory Automation Controller, Legacy Modem Interface, Medical Device Serial Interface, Networking Router Console Port.
Industrial PLC Serial Port
The MAX211IDBR is a core RS-232 transceiver for industrial PLC serial interfaces that need TIA/EIA-232-F signaling from a single 5 V supply. The device provides four drivers and five receivers — enough to support TX, RX, RTS, CTS plus DTR/DSR/RI/DCD handshake lines on a DB-9 connector. Its ±15 kV HBM ESD protection on cable-side pins survives direct hot-plug events and operator cable swaps on the factory floor, while the -40 °C to +85 °C industrial temperature range tolerates unheated control cabinets. The on-chip dual charge pump uses four 0.1 µF capacitors to generate the ±10 V rails needed for the ±9 V output swing, eliminating the need for external ±12 V supplies and reducing BOM cost and PCB area in PLC backplanes.
推薦
Point-of-Sale Terminal
POS terminals use the MAX211IDBR to interface legacy peripherals like barcode scanners, receipt printers, cash drawers, and magnetic-stripe readers that still expose RS-232 ports. The 120 kbps data rate is more than adequate for typical 9600-115200 baud peripheral traffic. The integrated ±15 kV ESD on serial-port connection pins eliminates the need for external TVS diodes, shrinking the BOM and reducing PCB footprint under the printer/scanner cable retention bracket. The 5 V supply matches legacy POS mainboards, and the 1.5 mA quiescent current keeps standby power low when the serial port is idle.
推薦
Embedded Serial Debug Console
Embedded boards frequently expose an RS-232 debug console on a header or DB-9 for firmware bring-up. The MAX211IDBR provides TX, RX, RTS, and CTS lines plus three spare handshake channels — enough to support console plus flow-controlled firmware download. Its single 5 V supply and four 0.1 µF charge-pump caps fit easily on a daughter board or debug card. The TTL/CMOS input threshold compatibility matches 3.3 V and 5 V UART logic with no level shifter needed at the logic side. Industrial temperature rating lets the same debug card be reused across prototypes and field-trial hardware.
推薦
Factory Automation Controller
Factory automation controllers use the MAX211IDBR on RS-232 ports that connect to legacy motion controllers, weigh scales, vision systems, and older HMIs. The TI datasheet specifies ±15 kV HBM ESD on cable pins, which protects against the static-discharge events common during cable routing in steel-frame panels. The 4-driver / 5-receiver configuration supports TX, RX, RTS, CTS, plus spare DTR/DSR handshake signals needed for some CNC and label-printer protocols. The 1.5 mA quiescent current is low enough to ignore in 24-hour-uptime factory systems. Industrial-grade operating temperature (-40 °C to +85 °C) covers unconditioned control cabinets.
推薦
Legacy Modem Interface
External 56k / V.92 modems and embedded cellular modules still expose RS-232 control interfaces for AT command frames. The MAX211IDBR's TIA/EIA-232-F compliance and ±9 V output swing meet the strict voltage levels these modems demand for legacy handshaking. The 120 kbps maximum data rate provides ample margin for the highest practical modem payload rates. The four-driver count covers TX, RX, RTS, CTS plus two spares, fitting even full-modem cable pinouts (TX/RX/RTS/CTS/DTR/DSR/RI/DCD) when paired with a sub-set selection. Single-supply 5 V operation simplifies the host-board power tree.
推薦
Medical Device Serial Interface
Medical monitoring and diagnostic instruments use the MAX211IDBR to expose RS-232 ports for service laptops, calibration equipment, and external recorders. The integrated ±15 kV ESD protection on cable pins increases the device's robustness against repetitive mating cycles in clinical environments. The -40 °C to +85 °C operating range covers the wide-temperature swings seen in portable medical carts and ambulances. The single 5 V supply and modest charge-pump capacitor count suit compact, isolated medical PCBs where the design must comply with IEC 60601-1 patient-safety leakage budgets. The TI datasheet guarantees full TIA/EIA-232-F compliance under all specified loads.
推薦
Networking Router Console Port
Networking routers and switches expose an RS-232 console port on the front panel for out-of-band management. The MAX211IDBR provides TIA/EIA-232-F-compliant voltage swings on TX, RX, and the hardware-flow-control lines required for high-speed console cable links. The 120 kbps maximum data rate matches the typical 115200 baud console speed. Single-supply 5 V operation lets the console port be powered directly from the router's always-on auxiliary rail, and the 1.5 mA standby current contributes negligibly to total system power. Industrial temperature rating supports outdoor cabinet and central-office deployments.
推薦
推薦產品摘要
工程參考資料，適用於 MAX211IDBR — 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 | MAX211CDB | MAX211IDBRG4 | MAX211IDW | MAX211ECAI+ | ADM211ARSZ | SP211EHCA-L/TR |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Maxim Integrated | Analog Devices | MaxLinear |
| Package | SSOP-28 (DB) | SSOP-28 (DB) - same | SSOP-28 (DB) - same | SOIC-28 (DW) - same | SSOP-28 - same | SSOP-28 (RS-28) - same | SSOP-28 - same |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Drivers / Receivers | 4 / 5 | 4 / 5 | 4 / 5 | 4 / 5 | 4 / 5 | 4 / 5 | 4 / 5 |
| Data Rate (Max) | 120 kbps | 120 kbps | 120 kbps | 120 kbps | 120 kbps | 120 kbps | 120 kbps |
| ESD (HBM, RS-232 pins) | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±15 kV |
| Operating Temperature | -40 °C to +85 °C | 0 °C to +70 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Charge-Pump Capacitors | 4 × 0.1 µF | 4 × 0.1 µF | 4 × 0.1 µF | 4 × 0.1 µF | 4 × 0.1 µF | 4 × 0.1 µF | 4 × 0.1 µF |
主要差異化特點
- First-party same-package drop-in for industrial temperature designs (對比MAX211CDB)
- On-die ±15 kV ESD on every cable-side pin (對比External TVS diode array)
- Single-supply operation with on-chip dual charge pump (對比Discrete RS-232 driver + external ±12 V rail)
設計說明
Place the four charge-pump capacitors (C1+, C1-, C2+, C2-) as close to the corresponding MAX211IDBR pins as possible. Keep traces short and use the ground plane beneath the SSOP-28 to minimize parasitic inductance that would otherwise couple charge-pump noise into V+ and V- rails. Add a 1 µF ceramic bypass capacitor on VCC within 50 mils of pin 24.
All unused driver inputs (DINx) must be tied to GND or VCC — never left floating — to prevent the output stage from sinking excessive charge-pump current. Likewise, all unused receiver inputs (RINx) on the cable side should be left floating; receiver outputs (ROUTx) on unused channels can be left open. Recommended: do not apply external voltage above ±25 V on RS-232 cable-side pins despite the ±15 kV ESD rating — sustained over-voltage damages the charge-pump regulators.
Maintain VCC between 4.5 V and 5.5 V — operation outside this range can starve the charge pump and reduce driver output swing below the ±5 V TIA/EIA-232-F minimum. For cable lengths above 10 m at 115200 baud, ensure the cable capacitance is below the standard 2500 pF / 100 ft budget, and consider adding a 100 Ω series resistor on each driver output to dampen reflections on high-capacitance cable assemblies.
The MAX211IDBR in SSOP-28 has θJA ≈ 75 °C/W (typical JEDEC 4-layer board). Worst-case power dissipation is VCC × Icc + driver load current × voltage drop — typically under 200 mW, well within thermal limits. No external heatsink is required under normal load. If the application drives continuously at maximum output swing into low-impedance loads, verify junction temperature rise is below 100 °C.
合規資訊
RoHS compliant per TI product page. The MAX211 family is not AEC-Q100 qualified; use MAX211-Q1 series for automotive applications. TIA/EIA-232-F compliant signaling.
