RS5C372A

The RS5C372A is a CMOS type real-time clock which is connected to the CPU via 2-wires and capable of serial transmission of clock and calendar data to the CPU.

Features of the RS5C372A are:(1)time keeping supply voltage ranging from 1.45 to 6.0 volts;(2)low supply current;(3)connected to the CPU via only 2-wires;(4)a clock conter and a calendar counter in BCD codes;(5)interrupt to the CPU;(6)two systems of alarm function;(7)oscillation halt sensing to judge internal data validity;(8)clock outpt of 32.768kHz;(9)second digital adjustment by ±30 seconds;(10)automatic leap year recognition up to the year 2009;(11)12-hour or 24-hour time display selectable;(12)oscillation stabilizing capacity incorporated;(13)high precision time trimming circuit;(14)oscillator of 35.768kHz or 32.000kHz may be used;(15)CMOS logic;(16)package :8pin SSOP.

The absolute maximum ratings of the RS5C372A can be summarized as:(1):the symbol is VDD,the item is supply voltage,the rating is -0.3 to +7.0,the unit is V;(2):the symbol is VI,the item is input voltage,the rating is -0.3 to +7.0,the unit is V;(3):the symbol is VO1,the item is output voltage1,the rating is -0.3 to +7.0,the unit is V;(4):the symbol is VO2,the item is output voltage2,the rating is -0.3 to +12,the unit is V;(5):the symbol is PD,the item is power dissipation,the rating is 300,the unit is mW;(6):the symbol is Topt,the item is operating temperature,the rating is -40 to +85,the unit is ;(7):the symbol is Tstg,the item is storage temperature,the rating is -55 to +125,the unit is .

The RS5C372A is designed as a CMOS typi real time clock which is connected to the CPU via 2-wires and capable of serial transmission of clock and calendar data to the CPU. It can generate various periodic interrupt clock pulses lasting for long period (one month), and alarm interrupt can be made by days of the week, hours and minutes by two incorporated systems. Since an oscillation circuit is driven at a constant voltage, it undergoes fluctuations of few voltage and consequently offers low current consumption (typ 0.5uA at 3V).

It has many features. (1) Time keeping voltage is 1.45V to 6.0V. (2) Lowest supply current is 0.5uA typ. (3) Connected to the CPU via only 2-wires (I2C bus interface, max 400kHz, address 7bit). (4) A clock counter (counting hours, minutes and seconds) and a calendar counter (counting leap years, years, months, days, and days of the week) in BCD codes. (5) Interrupt to the CPU (period of one month to one second, interrupt flag, interrupt half function). (6) Twp systems of alarm functions (days of the week, hours and minutes). (7) Oscillation halt sensing to judge internal data validity. (8) Clock output of 32.768kHz (32.000kHz) (output controllable via a register). (9) Second digit adjustment by +/-30 seconds. (10) Automatic leap year recognition up to the year 2099. (11) 12 hour of 24-hour time display selectable. (13) Oscillation stabilizing capacity incorporated. (14) High precision time trimming circuit. (15) Oscillator of 32.768kHz or 32.000kHz may be used. (16) CMOS logic. (17) package 8 pin SSOP. That are all the main features.

Some absolute maximum ratings have been concluded into several points as follow. (1) Its supply voltage would be from -0.3V to +7.0V. (2) Its input voltage would be from -0.3V to +7.0V. (3) Its output voltage 1 would be from -0.3V to +7.0V fos SDA. (4) Its output voltage 2 would be from -0.3V to +12V for INTRA, INTRB. (5) Its power dissipation would be 300mW. (6) Its operating temperature would be from -40 to +85°C. (7) Its storage temperature range would be from -55°C to +125°C. And so on. If you have any question or suggestion or want to know more information please contact us for details. Thank you!