MAX3110E/MAX3111E is a single-chip solution that integrates an RS-232 transceiver, a UART, and an SPI/QSPI/MICROWIRE-compatible serial interface. It features ±15kV ESD protection, a wide operating voltage range of 3V to 4.5V, and a low power consumption of 600µA. It is ideal for space-, cost-, and power-constrained applications.
The MAX3110E and MAX3111E combine a full‑featured UART with +15 kV ESD‑protected RS‑232 transceivers and internal charge‑pump capacitors in a 28‑pin package. They offer an SPI/QSPI/MICROWIRE‑compatible serial interface, low‑dropout output stage, and operate down to VCC = +3 V (MAX3111E) while consuming only 600 µA.
Typical applications include point‑of‑sale devices, handy terminals, telecom diagnostic ports, industrial front‑panel interfaces, and battery‑powered handheld equipment. The datasheet provides absolute maximum ratings, electrical characteristics, pin configuration, ordering information, and revision history.
| Supply Current (active) | 0.6 mA |
|---|---|
| Shutdown Supply Current | 10 µA |
| ESD Protection (Human Body Model) | +15 kV |
| Operating Voltage (VCC) | 5 V (MAX3110E) / 3.3 V (MAX3111E) |
| Maximum Data Rate | 230 kbps |
| UART Receive FIFO Depth | 8 words |
The devices are guaranteed to operate at up to 230 kbps while maintaining true RS‑232 voltage levels.
In shutdown the UART consumes only about 10 µA.
The RS‑232 I/O pins are protected up to +15 kV (Human Body Model) and +8 kV (IEC 1000‑4‑2 contact discharge).
The MAX3111E operates from a 3.3 V supply.