OUTLINE The RS5C372B is a CMOS type real-time clock which is connected to the CPU via 2-wire and capable of serial transmission of clock and calendar data to the CPU. The RS5C372B 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 (0.5µA at 3V). It also provides an oscillator halt sensing function applicable for data validation at power-on and other occasions and 32kHz clock output (CMOS output) for an external micro computer. The product also incorporates a time trimming circuit that adjusts the clock with higher precision by adjusting any errors in crystal oscillator frequencies based on signals from the CPU. The crystal oscillator may be selected between 32.768kHz or 32.000kHz types. Integrated into an ultra compact and ultra thin 8 pin SSOP package, the RS5C372B is the optimum choice for equipment requiring small sized and low power consuming products.
Features ● Time keeping voltage 1.45V to 6.0V ● Lowest supply current 0.5µA TYP (0.9µA MAX) at 3V(25°C) (0.9µA MAX) at 3V(-40 to +85°C) ● Connected to the CPU via only 2-wire (I2C-bus interface, max.400KHz, address 7bits) ● A clock counter (hours, minutes, and seconds) and a calendar counter (leap years, years, months, days, and days of the week) in BCD codes ● Interrupt to the CPU (period of one month to half second, with interrupt flag, interrupt halt function) (/INTR) ● Two systems of alarm functions (days of the week, hours, and minutes) (/INTR) ● Oscillation halt sensing to judge internal data validity ● Clock output of 32.768kHz(32.000kHz) ( output controllable via a register) (32KOUT:CMOS push-pull output) ● Second digit adjustment by ±30 seconds ● Automatic leap year recognition up to the year 2099 ● 12-hour or 24-hour time display selectable ● Oscillation stabilizing capacity (CG, CD) incorporated ● High precision clock error adjustment circuit ● Oscillator of 32.768kHz or 32.000kHz may be used ● CMOS logic ● Package:8PIN SSOP
DESCRIPTION The HI-8585 and HI-8586 are CMOS Integrated Circuits designed to directly drive the ARINC 429 bus in an8 pin package. Two logic inputs controla differential voltage between the output pins producinga +10 volt One,a -10 volt Zero, anda0 volt Null. The CMOS/TTL control inputs are translated to ARINC specified amplitudes using on board zeners. A logic input is provided to control the slope of the differential output signal. Timing is set by on-chip resistor and capacitor and tested to be within ARINC requirements. The HI-8585 has 37.5 ohms in series with each line driver output. The HI-8586 provides the option to bypass most of the output resistance so that series protection Circuits can add their resistances.
FEATURES • Direct ARINC 429 line driver interface in a small package • On-chip zener to set output levels • On-chip line driver slope control and selection by logic input • Low current 12 to 15 volt supplies • CMOS / TTL logic pins • Plastic and ceramic package options - surface mount and DIP • Themally enhanced SOIC packages • Mil processing available