---
name: "maxrtc"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/maxrtc"
---

# maxrtc(4)

Maxim DS1307/DS1339 real-time clock

## NAME

**maxrtc** – Maxim DS1307/DS1339 real-time clock

## SYNOPSIS

**maxrtc\* at iic?**

## DESCRIPTION

The **maxrtc** driver supports the Maxim DS1307 and DS1339 real-time clock chips, which provide a low-power, full binary-coded decimal (BCD) clock/calendar. In addition, the DS1307 comes with 56 bytes of NV SRAM.

## SEE ALSO

[iic(4)](/iic/4.md), [intro(4)](/intro/4.md)

## HISTORY

The **maxrtc** driver first appeared in OpenBSD 6.0.

## AUTHORS

The **maxrtc** driver was written by Marcus Glocker ⟨*mglocker@openbsd.org*⟩.