NXP Semiconductors Real Time Clocks PCF8583BS,518

The PCF8583BS is a real-time clock and calendar integrated circuit that features a 2048-bit static CMOS RAM organized as 256 words by 8 bits. It operates on a supply voltage range of 2.5 V to 6 V for the I¬=C-bus interface and 1.0 V to 6.0 V for the clock function, making it suitable for low-voltage applications. The device includes a built-in 32.768 kHz oscillator and supports a four-year calendar, with options for 12-hour or 24-hour time formats. This component allows for serial data transfer via a two-wire I¬=C-bus, with automatic word address incrementing after each read or write operation. It provides 240 bytes of low-voltage RAM for additional data storage, with the first 8 bytes designated for clock, calendar, and counter functions, while the next 8 bytes can be programmed as alarm registers or used as free RAM space. The device also features programmable alarm, timer, and interrupt functions, making it versatile for various applications. The PCF8583BS is packaged in a thermal-enhanced very thin quad flat package (HVQFN20) with 20 terminals, measuring 5 x 5 x 0.85 mm, which is beneficial for space-constrained designs.