MAX3225EEUP

The MAX3225EEUP is a Maxim (Analog Devices) dual RS-232 transceiver. It provides two drivers and two receivers to translate between TTL/CMOS UART levels and RS-232 voltage levels, enabling direct connection between a microcontroller or UART device and RS-232 peripherals (PCs, modems, etc.). It operates from a single supply (typically 3.0–5.5 V) and uses a charge-pump to generate the necessary RS-232 swings. The EEUP suffix indicates a RoHS-compliant, lead-free 16-pin package suitable as a drop-in replacement for MAX232-family devices. Key features usually include low quiescent current, full-duplex support on two channels, and RS-232 line protection/ESD. Typical use: wire MCU TX/RX to the logic pins (TxxIN/RxxOUT), and connect the RS-232 side to a DB9 interface. It’s ideal for any microcontroller serial interface requiring RS-232 compatibility with a compact, single-supply transceiver.

Equivalents (RS-232 transceivers with 1 Tx/1 Rx, 3.0–5.5 V, 0.1 µF caps):
- Analog Devices: ADM3221/ADM3222/ADM3223
- TI: SN75C3221/SN75C3223
- STMicroelectronics: SP3232/SP3232E
- Microchip: MCP2321/MCP2322
Note: verify pinout and supply voltage per your design, as packages and exact features vary.

Here are the typical features of MAX3225EEUP:
- Dual RS-232 transceiver: 2 drivers and 2 receivers
- Single-supply operation: 3.0 V to 5.5 V
- On-chip charge pump to generate RS-232 levels; requires external capacitors
- Supports standard RS-232 data rates (up to about 1 Mbps per channel)
- ESD protection on RS-232 lines
- Low quiescent current with optional shutdown/low-power mode
- Industrial temperature range (-40°C to +85°C)
- Small 8-pin package (EEUP variants)
Note: exact capacitor values and max data rate can vary by revision; refer to the datasheet for precise recommendations.

16 pins. It is a dual RS-232 transceiver: two drivers and two receivers that convert TTL/CMOS levels to RS-232 levels and RS-232 levels back to TTL/CMOS, using an internal charge pump to generate RS-232 voltages from a single supply.

- Manufacturer: Maxim Integrated. (Since 2021, Maxim Integrated has been part of Analog Devices.)
- What kind of company: A semiconductor company that designs analog and mixed-signal integrated circuits (historically fabless, outsourcing fabrication).

Applications of MAX3225EEUP (dual RS-232 transceiver):
- Embedded systems requiring MCU-to-RS-232 interface
- PC/serial peripherals (COM ports, modems, printers, barcode scanners)
- Industrial automation and instrumentation (PLC, SCADA, data loggers, test equipment)
- Networking/telecom equipment with RS-232 console ports
- Medical devices requiring RS-232 communication
- Point-of-sale terminals and other serial-enabled devices

16‑pin small‑outline package: SSOP‑16 (also commonly referred to as SOIC‑16).