MAX3222ECAP

MAX3222ECAP is a Maxim RS-232 transceiver (dual channel) that provides two drivers and two receivers to connect a microcontroller UART to RS-232 devices. It uses a single-supply charge-pump to generate the required RS-232 voltage swings from a logic-level supply.
ECAP denotes the external-capacitor version: the device requires external capacitors for the charge-pump network (per the datasheet) rather than relying on on-chip caps. You typically add the recommended C1–C4 (and a reservoir cap) near the IC with proper routing.
Key points:
- Dual RS-232 drivers/receivers; full-duplex capability
- Single-supply operation (common 3.0–5.5 V range)
- External capacitors required for the charge pump
- Small 8-pin package; suitable for UART-to-serial interfaces and embedded systems
- Includes standard RS-232 voltage swings, ESD protection, and low quiescent current
Common uses: microcontroller to PC serial link, USB-to-RS-232 adapters, data loggers, and other UART-based interfaces. Always consult the datasheet for exact capacitor values, voltage limits, and data-rate capabilities.

Common equivalents to MAX3222ECAP (2‑channel RS-232 transceivers):
- STMicroelectronics ST3232E / ST232
- Texas Instruments SP3232E
- Analog Devices ADM3222 / ADM2322
- Renesas/Intersil ISL3232
Note: pinouts and capacitor requirements vary; ensure same supply range (3–5.5V) and cap size per the datasheet.

Maxim MAX3222ECAP features (concise):
- 2 transmitter / 2 receiver RS-232 transceivers (two channels)
- Single-supply operation: 3.0 V to 5.5 V
- On-chip charge pump with four external capacitors to generate RS-232 levels
- RS-232 output swing typically ±6 V
- Data rate up to about 1 Mbps
- TTL/CMOS-compatible transmitter inputs; RS-232 inputs tolerant to standard levels
- Receiver outputs provide TTL/CMOS logic
- ESD protection on all RS-232 I/O lines
- Low-power operation suitable for portable/battery-powered apps
- 16-pin package; extended temperature options available
Notes: ECAP denotes external-capacitor charge-pump configuration (requires C1–C4, typically 0.1–1 µF).

- Pin count: 16 pins (16‑pin package, e.g., SOIC).
- Function: Dual RS-232 transceiver (two drivers and two receivers) with a charge-pump voltage converter to generate RS-232 levels from a single 3–5.5 V supply; requires external capacitors for the charge pump (C1+, C1−, C2+, C2−).

- Manufacturer: Maxim Integrated Products (the MAX3222ECAP is one of their RS-232 transceivers).
- What kind of company: A semiconductor company specializing in analog and mixed-signal integrated circuits (now part of Analog Devices, Inc.).

MAX3222ECAP is a dual RS-232 transceiver (TTL/CMOS to RS-232) that uses external charge-pump capacitors. Typical applications:
- Microcontroller/embedded-system serial interfaces to PCs, modems, printers, terminals
- Industrial automation and instrumentation (sensors, PLCs, data-logging devices)
- Portable/low-power equipment needing a compact, capacitor-based RS-232 transceiver
- Telecommunication/networking gear, test/measurement equipment, POS systems
- Any design requiring reliable, full-duplex RS-232 at 3–5V logic with minimal external components

MAX3222ECAP comes in an 8-pin small-outline package (SOP-8) with an exposed pad (ECAP variant) for heat dissipation.