MAX202EESE

MAX202EESE is a dual RS-232 transceiver from Maxim (MAX202 family). It provides TTL/CMOS logic on the microcontroller side and RS-232 voltage levels on the serial side, using a charge-pump powered from a single supply to generate the necessary ± voltages. It typically operates from about 3.0 to 5.5 V and supports data rates around 120 kbps. The device includes two transmitters and two receivers, enabling full-duplex communication with RS-232 devices. External charge-pump capacitors are required (the exact cap values depend on the variant). The EESE suffix indicates a specific package/temperature variant (e.g., an 8-pin package such as SOIC/TSSOP). Common applications include microcontroller to PC serial links, embedded serial interfaces, GPS, modems, and other RS-232 connections. For precise specs and package details, refer to the MAX202EESE datasheet.

Equivalent RS-232 2‑channel transceivers (3–5.5 V) to MAX202EESE include:
- Analog Devices: ADM232/ADM202
- STMicroelectronics: ST232 / ST3232
- Texas Instruments: SN65C3222 / SN75C3222 (and SN75C3242)
- Exar: SP3232 / SP3232E
- Maxim: MAX3232 (drop-in alternative)
Note: check pinout and supply voltage for a direct swap.

Here are concise features of MAX202EESE (RS-232 transceiver):
- Quad RS-232 transceiver: two drivers and two receivers
- Single-supply operation: typically 5V
- On-chip charge pump to generate RS-232 voltage levels
- TTL/CMOS-compatible inputs; RS-232-level outputs
- External capacitors required for charge pump (low-value caps, e.g., 0.1 µF)
- Industrial temperature grade: wide operating range (-40°C to +85°C)
- ESD protection on RS-232 lines
- Available in compact 16-pin packages (DIP/SOIC variants)
用途: Connect microcontrollers/MCUs to RS-232 devices (PCs, modems, etc.).

Pin count: 8 pins (8-pin package).
Function: Dual EIA/TIA-232 transceiver (two drivers and two receivers) that converts TTL/CMOS UART signals to RS-232 voltage levels and vice versa, using a charge-pump to generate the RS-232 voltages from a single supply.

- Manufacturer: Maxim Integrated Products.
- What kind of company: A semiconductor company that designs and sells analog and mixed-signal integrated circuits (fabless, i.e., it designs ICs and outsources fabrication). Note: Maxim was acquired by Analog Devices in 2021, so the MAX202 line is now part of Analog Devices.

MAX202EESE is a dual RS-232 transceiver (two drivers, two receivers) with an onboard charge pump. Common application areas:
- TTL/CMOS to RS-232 level shifting for microcontroller-based designs
- Serial links between PCs, modems, printers, routers, and embedded controllers
- Industrial automation, instrumentation, data loggers, and test equipment requiring RS-232
- Point-of-sale terminals and other banking/peripheral devices
- Network equipment consoles and management ports
These devices enable reliable RS-232 communication in consumer, industrial, and networking applications.

8-pin surface-mount package, typically an SOIC-8 (8-pin Small Outline).