MAX232ACSE+T - 5V RS-232 Transceiver, 2 Driver/2 Receiver | Maxim Integrated
MPN: MAX232ACSE+T ✓ Hoạt độngMAX232ACSE+T Tóm tắt
What is an RS-232 transceiver? An RS-232 transceiver is a type of line driver/receiver IC that translates logic-level UART signals (0V/5V or 0V/3.3V) to the bipolar ±5V to ±15V voltage levels defined by the EIA/TIA-232E and V.28/V.24 standards, enabling reliable data transmission between a microcontroller/FPGA and legacy serial ports, modems, point-of-sale terminals, and industrial instrumentation over cables up to 15 meters. The MAX232 family belongs to the broader category hierarchy: RS-232 transceiver -> line driver/receiver -> interface IC -> integrated circuit -> semiconductor.
Key features include a wide +4.5V to +5.5V single-supply range, on-board dual charge pump (no external ±12V required), 200 kbps guaranteed data rate, ±30V receiver input tolerance (HBM ESD on older MAX232 revisions), 1 µA low-power shutdown mode, and integrated ESD protection on the RS-232 pins (device-dependent). The NSOIC-16 surface-mount package provides a compact footprint suitable for industrial, embedded, and consumer designs.
The architecture uses an internal oscillator and four external 0.1uF charge-pump capacitors (C1+, C1-, C2+, C2-, V+, V-) to generate the required RS-232 voltage rails from a single +5V source. Drivers invert and level-shift TTL/CMOS inputs, while receivers accept bipolar RS-232 inputs and re-emit TTL/CMOS logic levels. The MAX232A variant specifies a higher slew rate than the original MAX232, supporting the 200 kbps data rate.
Typical applications include industrial PLC serial ports, point-of-sale (POS) terminals, embedded microcontroller UART bridges, legacy PC peripheral interconnects, GPS module interfaces, and battery-backed service equipment. The single +5V supply eliminates the bulky ±12V rails required by older RS-232 designs, simplifying power architecture.
When designing with the MAX232ACSE+T, place the four charge-pump capacitors (typically 0.1uF ceramic) as close as possible to the C1+, C1-, C2+, C2-, V+, and V- pins to minimize ripple on the generated RS-232 rails. For applications requiring higher ESD protection or faster data rates, consider the SP3232E or MAX3232 family (3.0V to 5.5V supply).
This page synthesizes distributor pricing, drop-in alternatives, application circuit recommendations, and design guidance not consolidated in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho MAX232ACSE+T — 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 MAX232ACSE+T (cùng hình factor và footprint) — khác nhau ở Package.
MAX232ACSE+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX232CSE+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX232EESE+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SP3232EBCN-L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SP3232EBCA-L/TR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX3232CSE+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX232ACSE+T Thông số kỹ thuật
| Chức năng | RS-232 Transceiver (2 Driver / 2 Receiver) |
| Tốc độ dữ liệu | 200 kbps |
| Điện áp cung cấp | 4.5 V to 5.5 V |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Duplex | Full |
| Receiver Input Voltage Range | ±30 V (HBM ESD tolerance on RS-232 inputs) |
| Nhiệt độ hoạt động | 0 °C to +70 °C (C grade) |
| Hộp | 16-SOIC (NSOIC, narrow body, 0.154" / 3.90 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Charge Pump Capacitors | 4 x 0.1 µF external (typical) |
| Shutdown Mode | Yes (active-low, device-dependent) |
| Trạng thái RoHS | Compliant |
| Packaging | Tape & Reel (+T suffix) |
Cấu hình chân MAX232ACSE+T
| Chân 1 | C1+ — Charge pump capacitor 1 positive terminal |
| Chân 2 | V+ — Charge pump generated +10V output |
| Chân 3 | C1- — Charge pump capacitor 1 negative terminal |
| Chân 4 | C2+ — Charge pump capacitor 2 positive terminal |
| Chân 5 | C2- — Charge pump capacitor 2 negative terminal |
| Chân 6 | V- — Charge pump generated -10V output |
| Chân 7 | T2OUT — RS-232 driver 2 output |
| Chân 8 | R2IN — RS-232 receiver 2 input |
| Chân 9 | R2OUT — TTL/CMOS receiver 2 output |
| Chân 10 | T2IN — TTL/CMOS driver 2 input |
| Chân 11 | T1IN — TTL/CMOS driver 1 input |
| Chân 12 | R1OUT — TTL/CMOS receiver 1 output |
| Chân 13 | R1IN — RS-232 receiver 1 input |
| Chân 14 | T1OUT — RS-232 driver 1 output |
| Chân 15 | GND — Ground |
| Chân 16 | VCC — +4.5V to +5.5V supply |
Ứng dụng tiêu biểu
MAX232ACSE+T phù hợp cho 7 Áp dụngs: Industrial PLC Serial Communication, Point-of-Sale (POS) Terminal RS-232 Ports, Microcontroller UART-to-RS-232 Bridge, GPS Module Serial Interface, Legacy PC Peripheral Interconnect, Battery-Backed Service Equipment, Modem and Telecommunication Equipment.
Industrial PLC Serial Communication
The MAX232ACSE+T is widely deployed as the RS-232 interface between industrial PLCs (Programmable Logic Controllers) and HMIs, programming ports, and SCADA systems. Its single-rail +5V operation eliminates the need for ±12V rails in the PLC cabinet, while the 200 kbps data rate supports Modbus RTU and proprietary serial protocols at typical 9600-115200 baud rates. The integrated charge pump and four 0.1uF capacitors deliver robust ±10V RS-232 levels over cables up to 15 m. Compared to optoisolated RS-485 transceivers, the MAX232ACSE+T provides simpler point-to-point connectivity for programming and diagnostics. Place the charge-pump capacitors within 3 mm of pins 1-6 and route the ESD-sensitive RS-232 traces away from switching nodes to maximize noise immunity in industrial environments.
Được đề xuất
Point-of-Sale (POS) Terminal RS-232 Ports
The MAX232ACSE+T is a standard RS-232 transceiver in POS terminals, connecting barcode scanners, receipt printers, cash drawer triggers, and customer displays to the main terminal controller. Its compact NSOIC-16 footprint fits space-constrained terminal enclosures, while the 4.5V-5.5V supply matches the typical +5V logic rail of embedded controllers. The 200 kbps data rate comfortably exceeds the 115200 baud commonly used by POS peripherals. The MAX232ACSE+T's on-board charge pump eliminates the bulky DC-DC converters needed for legacy RS-232 designs, reducing BOM and PCB area. For battery-powered terminals, an optional shutdown pin reduces quiescent current to 1 µA between transactions, extending operational hours.
Được đề xuất
Microcontroller UART-to-RS-232 Bridge
Embedded designs commonly use the MAX232ACSE+T to bridge a 3.3V or 5V microcontroller UART (TX/RX logic levels) to an external DB-9 RS-232 port for firmware updates, debugging, and field-service connections. The MAX232ACSE+T handles the bidirectional voltage translation between the MCU's 0-5V CMOS logic and the ±10V RS-232 signaling. The integrated charge pump removes the need for external DC-DC converters, and the 200 kbps data rate supports standard baud rates up to 115200 with margin. For battery-powered IoT devices, the optional shutdown pin enables near-zero quiescent current when the RS-232 port is idle. Reference designs from Maxim pair the MAX232ACSE+T with 8051, PIC, and ARM Cortex-M microcontrollers.
Được đề xuất
GPS Module Serial Interface
GPS receiver modules typically output NMEA 0183 sentences over UART at 4800 to 115200 baud using 0-3.3V or 0-5V CMOS logic, but some configurations require RS-232 levels for transmission over longer cables to navigation equipment, marine displays, or vehicle telematics systems. The MAX232ACSE+T serves as the level translator between the GPS module UART and the RS-232 host, with 200 kbps capability providing ample margin over typical NMEA traffic rates. The compact NSOIC-16 footprint allows placement near the DB-9 connector on marine and aviation equipment PCBs, while the +5V supply aligns with most automotive and marine power systems. For vehicular applications, consider the AEC-Q100-qualified MAX232EESE+ variant.
Được đề xuất
Legacy PC Peripheral Interconnect
Industrial PCs, test instruments, and laboratory equipment often include RS-232 (DB-9) ports for connecting legacy peripherals, sensors, and service tools. The MAX232ACSE+T provides the RS-232 transceiver function on the motherboard or add-in card, accepting TTL/CMOS UART signals from the system controller ASIC or Super-IO chip. The single +5V supply matches the standard PC power rails, and the integrated charge pump with four 0.1uF capacitors generates the required bipolar RS-232 levels. The 200 kbps data rate supports legacy peripherals at standard baud rates. Compared to USB-to-serial bridges, the MAX232ACSE+T retains native RS-232 hardware compatibility for legacy software drivers and industrial protocols.
Được đề xuất
Battery-Backed Service Equipment
Service equipment such as portable diagnostic tools, handheld terminals, and battery-powered industrial instruments rely on the MAX232ACSE+T for serial connectivity while drawing minimal quiescent current between transactions. The 1 µA shutdown mode (when enabled via the SHDN pin on similar-density family members) preserves battery life when the RS-232 port is idle. The +4.5V to +5.5V supply range operates directly from a 4-cell NiMH or single-cell Li-ion + boost converter arrangement. The robust ±30V receiver input tolerance protects against miswiring and ESD events commonly encountered in field-service scenarios. The NSOIC-16 package fits within tight handheld enclosures alongside LCDs, keypads, and battery management circuits.
Được đề xuất
Modem and Telecommunication Equipment
External dial-up modems, terminal adapters, and legacy telecommunication equipment use the MAX232ACSE+T as the DTE/DCE interface IC between the data pump and the RJ-11 telephone line interface. The full-duplex 2-driver/2-receiver configuration supports both transmit and receive data plus optional RTS/CTS handshaking. The 200 kbps data rate accommodates V.90 56k modem and various leased-line driver requirements. The bipolar ±10V RS-232 signal swing generated by the internal charge pump meets the EIA/TIA-232E and V.28/V.24 standards for reliable communication over telecom-grade cables. For modern broadband equipment, the MAX232ACSE+T is often used for service-port and console-port serial connectivity.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX232ACSE+T — 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 | MAX232ACSE+ | MAX232CSE+ | MAX232EESE+ | SP3232EBCN-L | MAX3232CSE+ |
|---|---|---|---|---|---|---|
| Package | 16-SOIC (NSOIC) | 16-SOIC (NSOIC) - same | 16-SOIC (NSOIC) - same | 16-SOIC (NSOIC) - same | 16-SOIC (NSOIC) - same | 16-SOIC (NSOIC) - same |
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | MaxLinear (formerly Sipex) | Analog Devices / Maxim Integrated |
| Data Rate | 200 kbps | 200 kbps | 120 kbps | 200 kbps | 250 kbps | 250 kbps |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V |
| Operating Temperature | 0°C to +70°C (C grade) | 0°C to +70°C | 0°C to +70°C | -40°C to +85°C | 0°C to +70°C | 0°C to +70°C |
| ESD Protection (HBM) | Standard (device-dependent) | Standard | Standard | Standard | 15 kV | 15 kV (E variant) |
| Drivers / Receivers | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 |
| Charge Pump Caps | 4 x 0.1 µF | 4 x 0.1 µF | 4 x 0.1 µF | 4 x 0.1 µF | 4 x 0.1 µF | 4 x 0.1 µF |
Bảo phân biệt quan trọng
- Maxim Integrated / Analog Devices heritage with broadest distributor availability (vsSP3232EBCN-L)
- Higher slew rate for 200 kbps vs original MAX232CSE+ 120 kbps (vsMAX232CSE+)
- Single-supply +5V operation eliminates ±12V rails (vsDiscrete RS-232 designs with DC-DC converters)
Ghi chú thiết kế
Place the four charge-pump capacitors (C1+, C1-, C2+, C2-) within 3 mm of their respective pins and use 0.1 µF ceramic capacitors (X7R or X5R) with low-ESR. Route the V+ and V- traces (pins 2 and 6) away from sensitive analog signals because these rails carry switching noise from the charge-pump oscillator at approximately 125 kHz. A small ferrite bead on the VCC supply line can further reduce conducted noise injection into upstream regulators.
The RS-232 driver outputs (T1OUT, T2OUT) slew at the MAX232A's higher rate (vs original MAX232) to support 200 kbps. Maintain controlled impedance on RS-232 traces if cable lengths exceed 3 m, and keep driver output traces short and direct to the DB-9 connector. Add 100 pF to 1 nF ceramic bypass capacitors on each RS-232 output pin for additional EMI suppression in noisy industrial environments.
Do not substitute polarized capacitors (tantalum or electrolytic) for the charge-pump capacitors - the bipolar voltage swings across C1+ to C1- and C2+ to C2- require non-polarized ceramic or film capacitors. Using polarized capacitors will result in catastrophic failure during power-up or charge-pump reversal. Also, ensure the VCC decoupling capacitor (0.1 µF) is on the supply pin (16) within 5 mm.
The MAX232ACSE+T in NSOIC-16 has a theta_JA of approximately 120 °C/W. At full-duplex operation with both drivers loaded at 5 mA RS-232 typical, internal power dissipation is roughly 30-40 mW, resulting in a 4-5 °C temperature rise above ambient. No heatsink is required. In enclosed industrial environments with ambient temperatures approaching +70 °C, ensure adequate airflow or thermal relief copper pour to maintain junction temperature below +150 °C.
Thông tin tuân thủ
RoHS and REACH compliant per Maxim Integrated product declarations. Not AEC-Q100 qualified - choose MAX232E or MAX232I variants for automotive. Halogen-free per JEDEC JS709. Tape and reel packaging (+T suffix) compliant with EIA-481.
