PCF8583T - Clock and calendar with 240 x 8-bit RAM



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The PCF8583 is a clock and calendar chip, based on a 2048 bit static

CMOS1 RAM organized as 256 words by 8 bits.

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.

Address pin A0 is used for programming the hardware address, allowing

the connection of two devices to the bus without additional hardware.

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.

The remaining 240 bytes are free RAM locations.

Features and benefits

I²C-bus interface operating supply voltage: 2.5 V to 6 V

Clock operating supply voltage 1.0 V to 6.0 V at 0 ℃ to +70 ℃

240 × 8-bit low-voltage RAM

Data retention voltage: 1.0 V to 6.0 V

Operating current (at fSCL = 0 Hz): max 50 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

Slave addresses: A1h or A3h for reading, A0h or A2h for writing


Teletext/broadcast antiope

Channel number display.

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PCF8583T - Clock and calendar with 240 x 8-bit RAM