MAX3222ECAP

MAX3222ECAP (MAX3222E CAP) is a 2‑channel RS‑232 transceiver. It provides two drivers and two receivers to connect a microcontroller’s TTL/CMOS logic to RS‑232 signals. It uses an on‑chip charge pump to generate the required RS‑232 voltage swings from a single supply (typically 3.0–5.5 V). The ECAP suffix denotes the external‑capacitor version: you must connect four external charge‑pump capacitors (typical values around 0.1–1 µF, commonly 1 µF) as shown in the datasheet. Features include low quiescent current and support for hundreds of kbps data rates, suitable for embedded serial interfaces. Typical applications are MCU to RS‑232 connections for modems, serial ports, GPS receivers, etc. Pinout includes VCC, GND, T1OUT/T2OUT, R1IN/R2IN, T1IN/T2IN, and corresponding handshake signals (depending on package). In short: a compact, low‑power RS‑232 interface requiring external capacitors.

Equivalents (2-channel RS-232 transceivers with charge pumps):
- TI SP3222 / SN3222
- Analog Devices ADM3222
- STMicroelectronics ST232
Note: These are functionally similar; verify supply voltage, capacitor requirements, and pinout to ensure cross-compatibility with MAX3222ECAP.

MAX3222ECAP features (concise):
- Dual RS-232 transmitter and dual RS-232 receiver (2 TX / 2 RX)
- Operates from a single 3.0 V to 5.5 V supply
- Internal charge-pump generates RS-232 levels from the single supply; requires four external capacitors (C1–C4, typical 1 µF)
- Exposed-pad (ECAP) package for improved thermal performance
- TTL/CMOS-compatible input thresholds and standard RS-232 output levels
- Compact 8-pin package for compact designs
- Low quiescent power in both idle and active operation
- Robust ESD protection on RS-232 I/O lines
Note: For exact capacitor values and electrical characteristics, refer to the official datasheet.

- Pin count: 16 pins (SOIC/16-pin package; ECAP denotes an exposed-pad variant).
- Function: Dual RS-232 transceiver (two drivers and two receivers). Converts TTL/CMOS on TIN1/TIN2 to RS-232 on TOUT1/TOUT2, and RS-232 on RIN1/RIN2 to TTL on ROUT1/ROUT2. Requires four external charge-pump capacitors (C1+, C1−, C2+, C2−) to generate the RS-232 voltage levels from a single supply (VCC, typically 3.0–5.5V). Pins include VCC, GND, V+, V−, TIN1/TIN2, TOUT1/TOUT2, RIN1/RIN2, ROUT1/ROUT2, and C1+/C1−, C2+/C2−.

Manufacturer: Maxim Integrated (now part of Analog Devices, Inc.). Maxim is an American fabless semiconductor company that designs and sells analog and mixed-signal integrated circuits.

Applications of MAX3222ECAP:
- RS-232 serial interface between microcontrollers/SoCs and PCs/terminals or other RS-232 devices
- Embedded systems, development boards, and data communication links
- Industrial automation, instrumentation, and data acquisition systems
- Automotive/equipment requiring extended temperature range
- Point-of-sale terminals, printers, and telecommunication gear (modems, routers)
- Portable/remote monitoring systems using RS-232 telemetry
Notes: provides two drivers and two receivers, operates from a single 3–5.5V supply with small external capacitors.

16-pin SOIC (surface-mount) package.