MAX3243EAI+T

MAX3243EAI+T is a MAXIM Integrated (now Analog Devices) RS-232 transceiver. It provides four transmitter/receiver channels to bridge a microcontroller’s UART (TTL/CMOS levels) to RS-232 signal levels.
Key points:
- Single-supply operation: 3.0 V to 5.5 V.
- Internal charge pump generates RS-232 voltage swings (roughly ±6 V) without external supplies.
- Four RS-232 drivers and four receivers enable multi-port serial interfaces.
- Requires external charge-pump capacitors (C1+, C1−, C2+, C2−, typically ~1 µF each).
- Suitable for typical PC/modem/serial peripheral links; supports standard RS-232 signaling and common baud rates.
- “EAI” denotes industrial/extended temperature (and RoHS-compliant) grade, while “+T” indicates Tape & Reel packaging.
Use when you need robust, multi-channel UART-to-RS-232 conversion in a compact, single‑supply package.

Equivalent quad RS-232 transceivers (3.0–5.5 V, 4 TX/RX channels):
- STMicroelectronics: ST3232E, ST3234E
- Texas Instruments: SN75C324x family (e.g., SN75C3244/3245)
- Analog Devices: ADM324x family
Note: check pinout, voltage, and packaging (Tape & Reel) for exact compatibility with MAX3243EAI+T.

Here are the key features of MAX3243EAI+T (quad RS-232 transceiver):
- Quad RS-232 transceiver: 4 drivers and 4 receivers
- Single-supply operation: 3.0V to 5.5V (suitable for 3.3V MCUs)
- Built‑in charge pump: generates RS-232 voltage levels from the supply
- Minimal external parts: typically just four small capacitors
- Data rates: up to about 250 kbps
- TTL/CMOS-compatible inputs; RS-232 level outputs
- Power management: Low quiescent current with shutdown/power-down option
- Industrial temperature option: -40°C to +85°C
- Robust I/O protection: ESD protection on RS-232 lines
- Packaging: RoHS-compliant AI version; Tape & Reel (+T) option available
Note: Always confirm exact specifications from the latest datasheet for your package and revision.

- Pin count: 20 pins (20-pin package).
- Function: Three-channel RS-232 transceiver (3 drivers and 3 receivers) with an internal charge-pump to generate RS-232 voltage levels from a single supply, suitable for TTL/CMOS logic interfaces.

- Manufacturer: Maxim Integrated (now part of Analog Devices).
- What kind of company: A global semiconductor company that designs and manufactures analog and mixed-signal integrated circuits, including interface, data-conversion, and power-management ICs for communications, computing, consumer electronics, industrial, and automotive applications.

MAX3243EAI+T is a triple RS-232 transceiver (three transmitters and three receivers). It converts TTL/CMOS logic levels to RS-232 levels and back, providing three independent RS-232 channels from one MCU. Suitable for devices needing multiple RS-232 ports: embedded controllers and development boards, data-logging/measurement instruments, industrial controllers/PLCs, POS terminals and printers, modems and console ports on network gear, lab/test equipment, and portable instrumentation. Features low power, integrated charge pumps, and compact packaging with the +T (tape-and-reel) option.

It’s a 20‑pin TSSOP (SMT) package, RoHS‑compliant, with the Tape‑and‑Reel (+T) option.