MAX232EWE

MAX232EWE is Maxim’s dual RS-232 driver/receiver IC. It lets a microcontroller or logic device communicate with RS-232 devices (PC COM ports, modems, etc.) by translating TTL/CMOS levels to RS-232 levels and back.
Key points:
- Architecture: two transmitters and two receivers on a single chip.
- How it works: on-chip charge pump generates RS-232 voltage rails from a single supply, with four external capacitors.
- Electricals: TTL/CMOS inputs; RS-232 outputs typically swing around ±6 to ±10 V; data rates around 120 kbps nominal.
- Supply and packaging: usually operates from about 4.5–5.5 V (some variants support 3.3 V); available in DIP-16/SO-16 packages.
- Variant note: the EWE suffix denotes a specific temperature/packaging option—check the datasheet for exact ratings.
Typical uses: microcontroller to PC serial interfaces, embedded serial links, data Acquisition, and other RS-232 links.

MAX232EWE is a 2-channel RS-232 transceiver with an internal charge pump. Equivalents from other vendors include: Analog Devices ADM232/ADM202; STMicroelectronics SP3232 (SP3232E); Exar/Sipex XR-232; and Maxim MAX3221/3222/3232. Any similar 2-channel RS-232 transceiver with external capacitors and a 3–5.5V supply is functionally equivalent.

Here are the typical features of MAX232EWE (RS-232 transceiver):
- Dual RS-232 drivers and receivers (two TX, two RX)
- On‑chip charge pump to generate RS‑232 levels from a single supply
- External charge-pump capacitors required (usually four)
- TTL/CMOS logic-compatible inputs; RS-232 outputs meet EIA‑232 levels
- Single-supply operation (typical supply range 4.5–5.5 V; check datasheet for exact variant)
- Extended temperature variant (industrial range, usually -40°C to +85°C)
- Low quiescent current and fast switching; no external inverters needed
- Small package options (8‑pin DIP or SO‑8); lead-free options
- ESD protection on RS‑232 and TTL/CMOS pins
Note: exact voltage ranges and tem­perature specs can vary by packaging and revision; consult the specific MAX232EWE datasheet for precise values.

- Pin count: 16 pins (DIP/SOIC variants).
- Function: Dual RS-232 transceiver (two drivers and two receivers). Converts TTL/CMOS logic to RS-232 voltage levels and RS-232 inputs back to TTL/CMOS. Uses an internal charge pump and requires four external capacitors to generate the ±RS-232 voltages. Typically operates from 4.5–5.5 V.

- Manufacturer: Maxim Integrated (now a part of Analog Devices after ADI’s 2020 acquisition).
- What kind of company: A semiconductor company that designs and markets analog and mixed-signal integrated circuits (generally fabless, using external foundries for manufacturing).

MAX232EWE is a 5V RS-232 transceiver (2 drivers, 2 receivers) that converts TTL/CMOS logic to RS-232 levels. Applications include:
- Microcontroller-to-PC serial links and serial peripherals
- Modems and telecom equipment
- Industrial automation and instrumentation (PLCs, data loggers, sensors)
- Point-of-Sale terminals and printers
- GPS/RS-232 peripherals and other devices needing RS-232 interfaces

MAX232EWE comes in a 16-pin SOIC (Small-Outline) package; the “WE” suffix denotes the wide-body variant.