This document is a product specification for the PCF8583 clock/calendar integrated circuit. The IC features a 240×8-bit RAM and supports counter function modes, alarm function modes, event counter mode, etc. The document also includes information on the I2C bus protocol and application information.
The PCF8583 is a clock/calendar integrated circuit that includes a 32.768 kHz oscillator, a 240 × 8‑bit low‑voltage RAM, and a two‑wire I²C bus interface. It supports four‑year calendar operation, a universal timer with alarm and overflow indication, and selectable 12‑ or 24‑hour formats. The device can operate from 2.5 V to 6 V on the I²C bus and from 1.0 V to 6 V for the clock function.
The datasheet contains a full feature list, functional description, block diagram, pin configuration, electrical characteristics, package options (DIP‑8 and SOP‑8), and ordering information. It also provides handling, soldering, and application notes for integrating the IC into designs.
| I2C‑bus supply voltage | 2.5 V to 6 V |
|---|---|
| Clock supply voltage (0 °C to +70 °C) | 1.0 V to 6.0 V |
| RAM size | 240 × 8‑bit (240 bytes) |
| Data retention voltage | 1.0 V to 6 V |
| Time base options | 32.768 kHz or 50 Hz |
| Ambient temperature range | -40 °C to +85 °C |
| Storage temperature range | -65 °C to +150 °C |
The I²C‑bus interface operates from 2.5 V to 6 V.
The device includes 240 bytes of 8‑bit low‑voltage RAM.
It can use either a 32.768 kHz crystal oscillator or a 50 Hz time base.