MAX3222EEUP

MAX3222EEUP is a dual RS-232 transceiver from Maxim Integrated (now Analog Devices). It provides two RS-232 drivers and two receivers, letting a microcontroller’s TTL/CMOS logic talk to RS-232 devices and vice versa. TTL/CMOS side: T_IN pins accept logic signals; T_OUT pins drive RS-232 levels. RS-232 side: R_IN pins receive RS-232 signals; R_OUT pins provide TTL/CMOS outputs. It runs from a single 3.0–5.5 V supply and includes an on‑chip charge pump to generate the required RS-232 voltage levels (typically around ±6 V) without external supplies. The device is designed for low power and small form factors, with RoHS-compliant packaging. Typical applications include MCU-to-PC serial links, embedded systems, modems, and serial peripherals. In use, connect T_IN to the MCU, T_OUT to the RS-232 cable, R_IN from RS-232 to R_OUT to the MCU, and ensure the required external charge-pump capacitors per the datasheet. The EEUP suffix indicates the package/variant (check the datasheet for exact pinout and capacitor values).

Equivalent parts (2-channel RS-232 transceivers with charge pump) include:
- STMicroelectronics: ST232, ST3232
- Analog Devices: ADM232, ADM3232
- Exar: SP3232, SP3232E
- Texas Instruments: SN75C3222 (and SN65C3222)
Note: check the datasheets for exact pinout, voltage ranges, and package to ensure compatibility.

Concise features of MAX3222EEUP:
- Dual RS-232 transceiver: 2 drivers and 2 receivers for two RS-232 ports.
- Single-supply operation: 3.0 V to 5.5 V.
- Internal charge-pump level shifter requiring external 0.1 μF capacitors (for V+, V− and pump).
- Outputs swing to RS-232 levels; inputs accept TTL/CMOS logic levels.
- Supports standard RS-232 data rates (multi-Mbps range in typical use).
- Low quiescent current with convenient power-management.
- I/O protection: robust ESD/short-circuit protection on pins.
- Small, RoHS-compliant package (EEUP variant).
Note: Exact capacitor count and package details may vary by revision; refer to the datasheet for the specific ordering code MAX3222EEUP.

- Pin count: 16 pins (16-pin package).
- Function: Dual RS-232 transceiver (two drivers and two receivers). Converts TTL/CMOS levels to RS-232 voltage levels and back, using a single supply with an on-board charge-pump to generate the required RS-232 voltages.

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

Typical applications of the MAX3222EEUP (a 2-channel RS-232 transceiver) include:
- RS-232 data interface for embedded/microcontroller systems to PCs, modems, printers, etc.
- TTL/CMOS to RS-232 level shifting for serial peripherals
- Data acquisition, instrumentation, and industrial automation serial links
- Point-of-sale terminals and handheld/battery-powered devices requiring low quiescent current

MAX3222EEUP uses a 16-pin TSSOP (Thin Shrink Small Outline Package) package.