The MAX3320 is a device that combines a microprocessor (µP) supervisory circuit with an RS-232 transceiver. It features precise monitoring of 5V and 3.3V power supply voltages, with a power-on reset pulse width of at least 100ms and power supply transient immunity. The device achieves a low supply current of 4µA with AutoShutdown Plus. The receivers are always active, and the power-on reset is always active. The device has a guaranteed data rate of 250kbps and comes in a space-saving 20-pin SSOP package.
The MAX3320 family combines a microprocessor supervisory circuit with a true RS‑232 transceiver. It operates from 3 V to 5.5 V, provides a guaranteed 250 kbps data rate, and features an active‑low RESET output that remains valid down to 1 V. The device includes an AutoShutdown Plus mode that reduces supply current to 4 µA when all inputs are inactive for more than 30 seconds.
Typical applications include palmtop computers, portable/battery‑powered equipment, and hand‑held devices. The part is offered in a 20‑pin SSOP package with selectable reset‑threshold voltage options (A, B, L, T). Pin functions, electrical characteristics, timing diagrams, and a typical operating circuit are provided in the document.
| Supply voltage range | 3 V to 5.5 V |
|---|---|
| Maximum data rate | 250 kbps |
| No‑load supply current | 0.45 mA |
| Package | 20‑pin SSOP |
The device supports a maximum data rate of 250 kbps.
It is supplied in a 20‑pin SSOP package.