The PCF8593 is a CMOS1 clock and calendar circuit, optimized for low power consumption. Addresses and data are transferred serially via the two-line bidirectional I²C-bus. The built-in word address register is incremented automatically after each written or read data byte. The built-in 32.768 kHz oscillator circuit and the first 8 bytes of the RAM are used for the clock, calendar, and counter functions. The next 8 bytes can be programmed as alarm registers or used as free RAM space.
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## Features
* I²C-bus interface operating supply voltage: 2.5 V to 6.0 V
* Clock operating supply voltage 1.0 V to 6.0 V at 0 ℃ to +70 ℃
* 8 bytes scratchpad RAM (when alarm not used)
* Data retention voltage: 1.0 V to 6.0 V
* External RESET input resets I²C interface only
* Operating current (at fSCL = 0 Hz, 32 kHz time base, VDD = 2.0 V): typical 1 μA
* Clock function with four year calendar
* Universal timer with alarm and overflow indication
* 24 hour or 12 hour format
* 32.768 kHz or 50 Hz time base
* Serial input and output bus (I²C-bus)
* Automatic word address incrementing
* Programmable alarm, timer, and interrupt function
* Space-saving SO8 package available
* Slave addresses: A3h for reading, A2h for writing
