MAX232CWE+T Analog Devices

The MAX232CWE+T from Analog Devices is a classic RS-232 transceiver integrated circuit designed to facilitate serial communication between TTL/CMOS logic levels and RS-232 voltage levels. This IC belongs to the MAX232 series and is housed in a compact SOIC-16 package. It integrates two drivers and two receivers, supporting full-duplex communication at data rates up to 200 kb/s. Operating from a single 5V supply, it simplifies design by generating the required ±7.5V RS-232 voltages internally using charge-pump capacitors. With an operating temperature range of 0°C to +70°C, it is widely used in data communication interfaces for computers, industrial controllers, and embedded systems where reliable serial port connectivity is essential.

Features

• Integrated Charge-Pump Voltage Converters: Generates compliant RS-232 ±7.5V output voltages from a single +5V supply, eliminating the need for external dual power rails.
• Full-Duplex Communication: Features 2 drivers and 2 receivers, enabling simultaneous bidirectional data transmission for efficient serial protocol handling.
• Compact SMD Solution: Offered in a space-saving SOIC-16 surface-mount package, suitable for automated PCB assembly and high-density board designs.
• Wide Supply Voltage Tolerance: Operates reliably with a supply voltage range from 4.5V to 5.5V, providing stability against typical power rail variations.

Technical Specifications

• Product Category: RS-232 Interface IC
• Function: Transceiver
• Data Rate: 200 kb/s
• Number of Drivers/Receivers: 2 Driver, 2 Receiver
• Duplex: Full Duplex
• Supply Voltage: 5 V (4.5 V Min, 5.5 V Max)
• Operating Supply Current: 10 mA
• Operating Temperature Range: 0 C to + 70 C
• Propagation Delay Time: 3.5 us (Driver), 1 us (Receiver)
• Package: SOIC-16
• Dimensions (Max): 10.5 mm (L) x 7.6 mm (W) x 2.35 mm (H)

Pin Configuration and Functions

• Pin1: C1+ - Positive terminal of charge-pump capacitor 1.
• Pin2: V+ - Output of the charge-pump doubler (+5V to +10V).
• Pin3: C1- - Negative terminal of charge-pump capacitor 1.
• Pin4: C2+ - Positive terminal of charge-pump capacitor 2.
• Pin5: C2- - Negative terminal of charge-pump capacitor 2.
• Pin6: V- - Output of the charge-pump inverter (+10V to -10V).
• Pin7: T2OUT - RS-232 output of Driver 2.
• Pin8: R2IN - RS-232 input of Receiver 2.
• Pin9: R2OUT - TTL/CMOS output of Receiver 2.
• Pin10: T2IN - TTL/CMOS input of Driver 2.
• Pin11: T1IN - TTL/CMOS input of Driver 1.
• Pin12: R1OUT - TTL/CMOS output of Receiver 1.
• Pin13: R1IN - RS-232 input of Receiver 1.
• Pin14: T1OUT - RS-232 output of Driver 1.
• Pin15: GND - Ground reference.
• Pin16: VCC - +5V power supply input.

Typical Applications

• Industrial PLC and Controller Serial Ports: Providing legacy RS-232 communication interfaces for programming and data exchange.
• PC Peripheral and Adapter Boards: Enabling serial communication for modems, barcode scanners, and legacy equipment.
• Embedded System Debug Consoles: Facilitating UART-based system debugging and firmware updates in microcontroller projects.
• Point-of-Sale (POS) Terminal Interfaces: Connecting cash drawers, receipt printers, or customer displays via serial port.

Equivalent / Alternative Parts

• MAX232AESE+T (Analog Devices) - Pin-to-pin compatible; offers enhanced ESD protection (±15kV) and a wider operating temperature range.
• ICL232CPE+ (Renesas) - Functional alternative with similar dual driver/receiver architecture and single 5V operation.

Advantages

• Simplified Power Design: The integrated charge pump eliminates the need for expensive and bulky dual ±12V power supplies, reducing overall system cost and complexity.
• Proven Reliability: As part of the industry-standard MAX232 family, it offers a well-understood and trusted solution for serial communication with extensive design-in history.

Limitations

• Limited Environmental Robustness: With an operating temperature range of 0°C to +70°C and no specified ESD protection, it is not suited for extended industrial or automotive applications without additional safeguards.
• Moderate Data Rate: A maximum data rate of 200 kb/s may be insufficient for applications requiring high-speed serial communication, such as some modern industrial protocols.

Package Information

SOIC-16 package (size approximately 10.5mm x 7.6mm), 16 pins, surface-mount design suitable for reflow soldering processes.

Manufacturer Information

Analog Devices is a global leader in the design and manufacturing of high-performance analog, mixed-signal, and digital signal processing (DSP) integrated circuits. The company's solutions are critical in converting real-world phenomena into actionable insights across a broad spectrum of applications, from industrial and automotive to communications and digital healthcare. Their product portfolio is known for its precision, reliability, and innovation.

Design-in Tips

• Charge-Pump Capacitor Selection: Use 1µF, low-ESR ceramic capacitors for C1-C4, placed as close as possible to the IC pins to ensure efficient voltage conversion and stable operation.
• Bypassing and Layout: Place a 0.1µF ceramic decoupling capacitor directly between VCC (Pin 16) and GND (Pin 15). Keep RS-232 signal traces short to minimize noise pickup and EMI radiation.
• Interface Protection: Since this variant lacks integrated ESD protection, consider adding external TVS diode arrays on the RS-232 line pins (T1OUT, T2OUT, R1IN, R2IN) for robust system-level ESD immunity.

Lifecycle Status & PCN/PDN Notes

Lifecycle status information is not provided in the input parameters. No Product Change Notification (PCN) or Product Discontinuation Notice (PDN) information is available for this specific part number at this time.