MAX3237CAI+T

MAX3237CAI+T is a quad RS-232 transceiver from Maxim Integrated (now Analog Devices). It provides four TTL/CMOS-to-RS-232 driver/receiver channels in one device, enabling you to connect microcontrollers or processors to RS-232 serial ports. The part uses an on-chip charge pump to generate the required RS-232 voltage levels from a single 3.0–5.5 V supply, so only external capacitors are needed.
Key points
- 4-channel RS-232 transceiver (drivers and receivers for four serial links)
- Single-supply operation (3.0–5.5 V)
- Generates RS-232 voltage levels (typical ±6 to ±10 V) from the logic-side supply
- Requires external capacitors (typical RS-232 capacitor ladder)
- Packaging/ordering: CAI denotes a specific package/industrial-temp variant; +T indicates Tape-and-Reel shipping
Typical uses
- Microcontroller/CPU to RS-232 devices (PC COM ports, modems, serial sensors)
- Embedded serial interfaces in industrial controllers and data-communication equipment
Note: For exact package, temperature range, cap values, and pinout, consult the datasheet for MAX3237CAI+T.

Key features of MAX3237CAI+T (RS-232 transceiver):
- 2 drivers and 2 receivers (dual RS-232 transceiver)
- Single-supply operation from 3.0 V to 5.5 V
- Requires external charge-pump capacitors to generate RS-232 levels
- TTL/CMOS-compatible input thresholds; RS-232 outputs swing to typical ±6 V
- Data rate up to about 1 Mbps (RS-232 compliant signaling)
- Low quiescent current with standby/shutdown option
- 8-pin package (CAI+T), RoHS-compliant
- Wide operating temperature range (typical industrial range)
Note: exact capacitor values and performance can vary by revision; consult the latest datasheet for precise specs.

Package: 16‑pin SOIC (small‑outline) package. +T indicates Tape‑and‑Reel packaging.

Pin count: 20 pins (20‑pin package).
Function: Quad RS-232 transceiver (four drivers and four receivers). It translates between TTL/CMOS UART levels and RS-232 voltage levels, using an internal charge pump to generate the ±RS-232 voltages from a single supply. Suitable for interfacing multiple UARTs to RS-232.

Manufacturer: Maxim Integrated Products, Inc. (now part of Analog Devices, Inc.).
What kind of company: A multinational fabless semiconductor company that designs and markets analog and mixed-signal integrated circuits.

MAX3237CAI+T is a low-power RS-232 transceiver (TTL/CMOS to RS-232 level shifter). Applications: embedded systems and microcontroller projects needing a serial port; PCs/modems/printers and other RS-232 devices; instrumentation, data loggers and test equipment; industrial automation and process control with RS-232 consoles; POS terminals; telecom/network equipment management ports; any device requiring reliable TTL-to-RS-232 conversion.

Equivalents to MAX3237CAI+T (RS-232 transceiver with charge pump) from other vendors include:
- Texas Instruments SP3232/SP3233 family
- STMicroelectronics ST3232/ST3233 family
- Analog Devices ADM232 (select 2‑channel variants for matching needs)
Note: choose by channel count, supply (3.3/5V), and package; cross-reference data sheets for exact pinout.