This datasheet provides detailed information on the PHILIPS PCF8593 low-power clock/calendar. The chip uses the I2C bus and has low power consumption, high precision, and multiple functions, making it suitable for use in various low-power electronic devices.
The PCF8593 is a CMOS low‑power clock/calendar circuit with an integrated 32.768 kHz oscillator and optional 50 Hz time base. It communicates via a two‑wire I²C bus and provides eight bytes of scratch‑pad RAM that can be used for alarm registers when not needed for timekeeping.
The device is offered in DIP‑8 and SO‑8 packages and includes a full set of registers for clock, alarm, timer and event‑counter functions. Electrical characteristics, pin assignments and functional descriptions are provided for designers integrating the part into battery‑operated or space‑constrained applications.
| I²C‑bus interface supply voltage | 2.5 V to 6.0 V |
|---|---|
| Clock operating supply voltage (0 °C to +70 °C) | 1.0 V to 6.0 V |
| Scratch‑pad RAM | 8 bytes |
| Data retention voltage | 1.0 V to 6.0 V |
| Operating current (typical, Vop = 2.0 V, 32 kHz) | ≈ 1 µA |
| Oscillator / time‑base options | 32.768 kHz or 50 Hz |
| I²C slave address | READ A3, WRITE A2 |
The I²C‑bus interface operates from 2.5 V to 6.0 V.
It provides a 32.768 kHz crystal oscillator and can also run on a 50 Hz time base.
The device includes 8 bytes of scratch‑pad RAM that can be used for alarm registers when not needed for timekeeping.