MAX3218CAP+T

The MAX3218CAP+T is a Maxim RS-232 transceiver (or multi‑channel transceiver in the MAX3218 family) that converts between TTL/CMOS logic levels and RS-232 voltages. It includes onboard charge-pump circuitry to generate RS-232 voltage levels from a single supply (typically 3.0–5.5 V), so no dual supply is needed. It provides one or more driver/receiver channels for connecting microcontrollers to RS-232 ports, supports standard UART data rates (up to several Mbps), and offers TTL/CMOS-compatible I/O, 3-state outputs, and protection features (e.g., ESD). The +T suffix indicates Tape‑and‑Reel packaging, and CAP refers to a variant of the part. Use it in embedded systems to interface a microcontroller with a PC or other RS-232 devices.

Equivalents (RS-232 transceivers, two drivers/two receivers with charge-pump): Maxim: MAX3221, MAX3223, MAX3232; Analog Devices: ADM232/ADM232A; STMicroelectronics: ST3232; Exar: SP3232E. All require external capacitors similar to MAX3218CAP. Pinouts/voltage ranges vary; verify Vcc (3.0–5.5V) and package compatibility before substitution.

Here are the typical features of MAX3218CAP+T (RS‑232 transceiver with CAP+/T suffix):
- Dual RS‑232 transmitter/receiver (two drivers, two receivers)
- Single-supply operation from 3V to 5.5V
- On‑chip charge pump to generate RS‑232 levels; external capacitor network required (Cap+ and Cap−)
- RS‑232 level swings (typical ±6V to ±10V) with TTL/CMOS input compatibility
- Up to ~1 Mbps data rate (full‑duplex)
- Low quiescent current; supports optional shutdown
- ESD protection on RS‑232 I/O pins
- Cap+ variant with external capacitor requirement; Tape & Reel packaging (T suffix)
Note: Exact electrical specs (voltages, data rate, currents) vary by revision; consult the datasheet for precise numbers.

Pin count: 8 pins (SOIC/DIP-8).
Function: Single-channel RS-232 transceiver (one driver, one receiver) that converts TTL/CMOS UART levels to RS-232 levels and back; requires external charge-pump capacitors (CAP) and is offered in Tape & Reel packaging (T).

Manufacturer: Maxim Integrated (now part of Analog Devices).
Kind of company: A global semiconductor company specializing in analog and mixed-signal integrated circuits.

MAX3218CAP+T is an RS-232 transceiver with charge-pump. Common applications:
- Microcontroller-based systems needing RS-232 interfaces
- PCs, modems, printers and other serial peripherals
- Industrial automation, PLCs, data acquisition and instrumentation
- Medical and laboratory equipment with RS-232 ports
- Point-of-Sale terminals and barcode scanners
- Networking/telecom equipment (console ports)
- Test, measurement, and educational equipment
- Portable/battery-powered instruments (CAP version suited for compact designs)

16-pin Small-Outline IC package (SOIC-16); Tape‑and‑Reel option (+T) available.