MAX3325 is an integrated RS-232 transceiver, 5V power supply and temperature-compensated contrast control chip, suitable for 3V instruments that require a 5V supply for logic or LCD display, with adjustable bias signal for contrast, LCD temperature compensation and an RS-232 interface for serial communications.
The MAX3325 is a 3 V dual RS‑232 transceiver that integrates an LCD supply, a temperature‑compensated contrast controller, and a 6‑bit DAC. It is designed for small battery‑powered instruments such as PDAs, handheld terminals, GPS receivers, medical equipment, and industrial test gear, providing a regulated 5 V output at up to 11 mA and selectable LCD bias.
The device includes independent shutdown control for the RS‑232 and LCD sections, a charge‑pump based dual‑voltage regulator, and a full set of pin functions for easy integration. It is offered in 28‑pin SSOP and narrow‑DIP packages and meets EIA‑232E specifications up to 250 kbps.
| Supply Voltage Range | 3.0 V to 3.6 V |
|---|---|
| Regulated 5 V Output Current | 11 mA |
| DAC Resolution | 6‑bit (64 levels) |
| LCD Bias Selection | Positive or Negative |
| Package Types | 28‑pin SSOP, narrow‑DIP |
It operates from a single supply of 3.0 V to 3.6 V.
The internal regulator can supply up to 11 mA of 5 V output.
The built‑in DAC offers 6‑bit resolution, giving 64 contrast levels.