MAX253CSA

MAX253CSA is a Maxim RS-232 transceiver (dual driver/receiver) that lets a microcontroller talk to a PC/modem-style serial port. It generates the required RS-232 voltage levels from a single supply using an internal charge-pump, with external capacitors.
Key points:
- TTL/CMOS side: TIN and ROUT connect to the MCU (TX to TIN, RX from ROUT).
- RS-232 side: TOUT and RIN connect to the RS-232 lines (TOUT to TX line, RIN from RX line).
- Generates ± voltages for RS-232 from a 3.0–5.5 V supply; supports typical RS-232 levels.
- Includes two drivers and two receivers, suitable for two independent UARTs.
- Features low power operation and requires proper decoupling and the recommended charge-pump capacitors.
- Available in commercial temperature/packaging options (e.g., small-outline packages such as SSOP/TSSOP); check exact datasheet for pinout and cap values.
For precise electrical specs (data rate, voltage levels, cap values, pinout), refer to the MAX253CSA datasheet.

MAX253CSA is a dual RS-232 transceiver with a charge pump. Direct equivalents: MAX253, MAX253A, MAX253C (MAX253 family). Cross-refs from other vendors: TI SN75C232; Exar/SP232/SP3232 family; ST SP3232/ST232; Analog Devices ADM232/ADM3232. For exact swap, check a cross-reference database and verify voltage (typically 3.0–3.6 V) and pinout.

Here are typical features for the MAX253CSA (RS‑232 transceiver family). Note: exact specs can vary by revision/package; check the datasheet for the specific variant.
- Dual RS‑232 transmitter and receiver (2 drivers, 2 receivers).
- Wide supply range: 3.0 V to 5.5 V (compatible with 3.3 V and 5 V systems).
- On‑chip charge pump to generate RS‑232 levels; requires external pump capacitors.
- True RS‑232 level outputs (approximately ±6 V swing).
- TTL/CMOS logic‑level input compatibility.
- Up to about 1 Mbps data rate capability.
- Low power operation with enable/shutdown options.
- Robust protection: ESD/short‑circuit protection on I/O pins.
- Small package (CSA suffix indicates specific package variant).

- Pin count: 16 pins (e.g., SSOP-16)
- Function: Dual RS-232 transceiver (two drivers, two receivers) with an onboard charge-pump to generate the necessary RS-232 voltage levels from a single supply; external capacitors required.

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

MAX253CSA is an RS-232 transceiver. Typical application areas include:
- Serial interfaces for computers, modems, printers, routers, and networking gear
- Embedded systems and microcontroller projects needing TTL/CMOS to RS-232 level shifting
- Industrial automation, instrumentation, and process control
- Test and measurement equipment and data loggers
- Automotive diagnostic tools
- Medical and laboratory equipment with RS-232 ports

MAX253CSA comes in a 16-pin package, typically the SOIC-16 (Plastic Small-Outline) variant.