MAX3241CAI+ - 3V-5.5V RS-232 Transceiver, 1Mbps | Analog Devices
MPN: MAX3241CAI+ ✓ Hoạt độngMAX3241CAI+ Tóm tắt
A RS-232 transceiver is a type of line driver/receiver interface IC that converts logic-level (TTL/CMOS) signals to/from the bipolar ±5V to ±15V voltage swings required by the EIA/TIA-232-E standard. It belongs to the broader category of serial interface ICs (RS-232, RS-422, RS-485, UART transceivers), which sit between a microcontroller UART and the physical cable in point-to-point or multipoint data links. Charge-pump transceivers like the MAX3241 family simplify system design by generating the required transmitter output voltages internally from a single low-voltage rail.
Key features include a 1Mbps guaranteed data rate (250kbps in the standard mode, up to 1Mbps with low-ESR capacitors), always-active extra receiver outputs for monitoring external peripherals, ±15kV ESD protection on transmitter outputs and receiver inputs (HBM), and an automatic shutdown mode that drops supply current to 1uA while keeping one receiver active. The always-on monitoring receivers (R1 and R2 extra outputs) make this part especially useful in portable and battery-powered designs that must wake the host on cable or peripheral activity.
The MAX3241 uses a low-dropout transmitter output stage that maintains true RS-232-compliant output levels (±5V minimum) even when operating from a discharged battery, together with an internal dual charge pump that generates the positive and negative supplies from a single 3.0V to 5.5V rail. Four small 0.1uF external capacitors provide the pump energy storage, reducing BOM cost and board area versus ±12V solutions.
Typical applications include battery-powered point-of-sale terminals, industrial handheld instrumentation, networking equipment (routers, switches), laptop and notebook serial ports, cellular phone data cables, and any embedded system requiring a TIA/EIA-232-E compliant UART link from a single low-voltage logic supply.
When designing with this device, place the four 0.1uF charge-pump capacitors as close as possible to the IC pins and use a low-ESR ceramic type to achieve the 1Mbps data rate. Add bulk decoupling (0.1uF + 1uF) on VCC near the device to suppress supply noise. Verify that downstream receivers tolerate the MAX3241's ±5V minimum output swing if your cable is unusually long.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho MAX3241CAI+ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MAX3241CAI+ (cùng hình factor và footprint) — khác nhau ở Data Rate, Package.
MAX3241ECAI+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX3241CAI+T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ICL3241CAZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ST3241EBPR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX3243ECAI+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX3241CAI+ Thông số kỹ thuật
| Manufacturer | Analog Devices (Maxim Integrated) |
| Part Number | MAX3241CAI+ |
| Chức năng | Transceiver |
| Protocol | RS-232 |
| Number of Drivers | 3 |
| Number of Receivers | 5 |
| Duplex | Full |
| Điện áp cung cấp | 3.0 V to 5.5 V |
| Tốc độ dữ liệu | Up to 1 Mbps |
| ESD Protection | ±15 kV (HBM, driver outputs and receiver inputs) |
| Supply Current (Shutdown) | 1 uA (with one receiver active) |
| External Capacitors | 4 x 0.1 uF |
| Nhiệt độ hoạt động | 0 C to +70 C (commercial, CAI suffix) |
| Hộp | 28-SSOP (5.30 mm body width) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân MAX3241CAI+
| Chân 1 | EN — Receiver enable (active low) - high puts receivers in 3-state |
| Chân 2 | C1+ — Charge-pump capacitor 1 positive terminal |
| Chân 3 | V+ — Charge-pump generated +5.5V supply |
| Chân 4 | C1- — Charge-pump capacitor 1 negative terminal |
| Chân 5 | C2+ — Charge-pump capacitor 2 positive terminal |
| Chân 6 | C2- — Charge-pump capacitor 2 negative terminal |
| Chân 7 | V- — Charge-pump generated -5.5V supply |
| Chân 8 | R1OUT — Receiver 1 TTL/CMOS output |
| Chân 9 | R2OUT — Receiver 2 TTL/CMOS output |
| Chân 10 | R3OUT — Receiver 3 TTL/CMOS output |
| Chân 11 | R4OUT — Receiver 4 TTL/CMOS output |
| Chân 12 | R5OUT — Receiver 5 TTL/CMOS output |
| Chân 13 | R1OUTB — Always-active extra output for receiver 1 (monitor) |
| Chân 14 | R2OUTB — Always-active extra output for receiver 2 (monitor) |
| Chân 15 | FORCEON — Force ON input (active high overrides auto-shutdown) |
| Chân 16 | INVALID — Invalid signal indicator (active low when all RS-232 inputs invalid) |
| Chân 17 | GND — Ground |
| Chân 18 | T1OUT — RS-232 driver 1 output |
| Chân 19 | T2OUT — RS-232 driver 2 output |
| Chân 20 | T3OUT — RS-232 driver 3 output |
| Chân 21 | R3IN — RS-232 receiver 3 input |
| Chân 22 | R4IN — RS-232 receiver 4 input |
| Chân 23 | R5IN — RS-232 receiver 5 input |
| Chân 24 | R1IN — RS-232 receiver 1 input |
| Chân 25 | R2IN — RS-232 receiver 2 input |
| Chân 26 | VCC — +3.0V to +5.5V supply input |
| Chân 27 | T1IN — TTL/CMOS driver 1 input |
| Chân 28 | T2IN — TTL/CMOS driver 2 input |
Ứng dụng tiêu biểu
MAX3241CAI+ phù hợp cho 6 Áp dụngs: Battery-Powered Point-of-Sale Terminals, Industrial Handheld Instrumentation, Networking Equipment Console / Management Ports, Laptop / Notebook Docking Stations, Embedded System Debug / Boot Loader Ports, Cellular / GNSS Module Data Cables.
Battery-Powered Point-of-Sale Terminals
The MAX3241CAI+ is well suited to handheld POS terminals where a 3.0V to 5.5V Li-ion supply powers the host MCU and a separate EIA/TIA-232-E link is needed for receipt printers or magnetic-stripe readers. Its 1uA shutdown current (with one receiver still active) and the always-on extra monitor outputs (R1/R2) let the terminal sleep until a peripheral asserts wake, dramatically extending battery life. The 1Mbps data rate handles legacy serial printers without bottlenecks. Place four 0.1uF X7R ceramics within 5mm of the C1+/C1-/C2+/C2- pins.
Được đề xuất
Industrial Handheld Instrumentation
Industrial handheld multimeters, barcode scanners, and process calibrators often need a robust RS-232 link to a host PC or datalogger while running from a 3.6V Li-ion or 4xAA stack. The MAX3241CAI+ supports both rails (3.0V-5.5V) and delivers ±15kV HBM ESD on the DB-9 pins, reducing field-failure rates when cables are hot-plugged. Five receivers (vs two on MAX3232) allow simultaneous connection to multiple external sensors or to a printer plus a host. The 28-SSOP footprint fits inside compact handheld enclosures.
Được đề xuất
Networking Equipment Console / Management Ports
Routers, switches, and small-cell base stations routinely expose an RS-232 console port for out-of-band management, even when the main logic runs at 1V or 1.8V core voltages. The MAX3241CAI+ can be powered directly from a 3.3V or 5V auxiliary rail and translates logic-level UART signals from the management MCU to true ±5V RS-232 levels for the RJ-45 console jack. The integrated dual charge pump removes the need for a bulky DC-DC converter to generate ±12V. Always-on monitor outputs can detect a console cable insertion and wake the management processor.
Được đề xuất
Laptop / Notebook Docking Stations
Docking stations frequently expose legacy DB-9 RS-232 ports to support older peripherals (label printers, industrial bar-code readers, scientific instruments). The MAX3241CAI+ integrates 3 drivers and 5 receivers in a single 28-SSOP, which is enough to drive TX/RTS/DTR and read RX/CTS/DSR/RI/DCD plus one spare monitor line. Operating from a 3.3V or 5V dock rail and using only four 0.1uF pump capacitors, it fits small docking-station PCBs without the cost or height of a DC-DC plus discrete RS-232 solution.
Được đề xuất
Embedded System Debug / Boot Loader Ports
Embedded Linux or RTOS development boards often include an RS-232 debug UART that remains functional across power domains and boot states. The MAX3241CAI+ operates from the same 3.3V rail as the MCU and survives cable hot-plug events thanks to integrated ±15kV HBM ESD. The 1Mbps data rate supports fast bootloader image downloads, shortening firmware-update cycles on the manufacturing line. Five receivers give developers access to multiple handshake lines plus a free monitor line for custom debug signaling.
Được đề xuất
Cellular / GNSS Module Data Cables
Cellular modules (2G/3G/4G) and GNSS receivers frequently expose diagnostic / NMEA serial links over RS-232. The MAX3241CAI+ connects the module's CMOS UART to a PC or external logger via a true ±5V RS-232 link, all from a 3.3V or 5V single rail. Four small 0.1uF ceramic capacitors provide the charge-pump energy storage, keeping the BOM and PCB footprint compact. The integrated ±15kV ESD protects against cable discharge events common when antennas are co-located with the serial cable.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX3241CAI+ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MAX3241ECAI+ | MAX3241CAI+T | ICL3241CAZ | ST3241EBPR | MAX3243ECAI+ |
|---|---|---|---|---|---|---|
| Package | 28-SSOP (5.30 mm) | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Brand | Analog Devices (Maxim) | Analog Devices | Analog Devices | Renesas Electronics | STMicroelectronics | Analog Devices |
| Supply Voltage | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V |
| Drivers / Receivers | 3 / 5 | 3 / 5 | 3 / 5 | 3 / 5 | 3 / 5 | 3 / 5 |
| Data Rate | Up to 1 Mbps | Up to 1 Mbps | Up to 1 Mbps | Up to 250 kbps | Up to 400 kbps | Up to 250 kbps |
| ESD Protection | ±15 kV HBM | ±15 kV IEC 61000-4-2 | ±15 kV HBM | ±15 kV HBM | ±15 kV HBM | ±15 kV IEC 61000-4-2 |
| External Capacitors | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF |
| Shutdown Current | 1 uA (1 receiver active) | 1 uA (1 receiver active) | 1 uA (1 receiver active) | 1 uA (1 receiver active) | 1 uA (1 receiver active) | 1 uA |
| Always-On Monitor Outputs | Yes (R1, R2 extra outputs) | Yes | Yes | Yes | No | No |
Bảo phân biệt quan trọng
- Always-on extra receiver outputs (R1OUTB, R2OUTB) for cable/peripheral monitoring (vsMAX3243ECAI+)
- Cross-brand second-source from Renesas in same 28-SSOP package (vsICL3241CAZ)
- Integrated ±15 kV HBM ESD on driver and receiver pins (vsST3241EBPR)
- 3.0V to 5.5V single-supply operation eliminates ±12V DC-DC (vsDiscrete RS-232 driver + DC-DC converter)
Ghi chú thiết kế
Place the four 0.1uF charge-pump capacitors (C1+, C1-, C2+, C2-) as close as possible to the corresponding pins and use a low-ESR ceramic type (X7R or X5R) to achieve the 1Mbps data-rate spec. Estimated: with 0.1uF X7R in 0603 at 5mm trace length, charge-pump impedance stays below 1 ohm at the pump switching frequency and supports full 1Mbps operation. Add a 0.1uF + 1uF decoupling pair on VCC (pin 26) within 2mm to suppress supply noise that could couple into the charge pump and degrade RS-232 output levels.
RS-232 cable lengths above 10 meters and data rates above 250 kbps require low-ESR capacitors AND short, parallel PCB traces between the IC and the DB-9 connector. Estimated: a 50mm differential trace pair at 1Mbps has roughly 5ns of propagation delay, which is acceptable for RS-232 timing but excessive for the on-chip charge-pump. Keep the T_OUT/R_IN traces to the connector shorter than 30mm and avoid running them parallel to clock or switching-power traces to prevent EMI-induced RS-232 errors.
Use the FORCEON pin (pin 15) high for normal operation; drive it low only if you want the auto-shutdown circuit to power down the drivers when no valid RS-232 input is detected. INVALID (pin 16) goes active low when all RS-232 receiver inputs are invalid (below +2.7V or above -2.7V), which the host MCU can use to decide whether to enter deep-sleep. This auto-shutdown plus the 1uA quiescent current (with one receiver active) is the key battery-life feature of the MAX3241 family versus MAX3232.
Do not use the non-'+' MAX3241CAI variant in new designs - it contains lead and is not RoHS-compliant. Do not exceed 5.5V on VCC or apply voltage to T_OUT/R_IN before VCC is present, as this can latch up the charge pump. The receivers are rated to survive ±25V on their inputs, but the transmitters output ±5V minimum (not ±12V), so any cable longer than 15m at high data rate will fail the TIA/EIA-232-E minimum-level compliance test. For cable runs above 15m use the MAX3232 family at 120 kbps instead.
Thông tin tuân thủ
RoHS and REACH compliant per Maxim/Analog Devices product page. '+' suffix confirms lead-free. AEC-Q100 not applicable - this is a commercial-grade (0 C to +70 C) interface IC. Operating temperature is commercial grade; industrial-temperature grades would carry an E suffix (e.g., MAX3241EAI+).
