RT5C348B (TSSOP10G) and RS5C348B (SSOP10) are the discontinued products. As of July in 2016. NO. EA-054-160701 12345 4-wire Serial Interface Rx5C348A/B OUTLINE The Rx5C348A/B are CMOS real-time clock ICs connected to the CPU by our f signal lines, CE, SCLK, SI, SO, and configured to perform serial transmission of time and calendar data to the CPU. The periodic interrupt circuit is configured to generate interrupt signals with six selectable interrupts ranging from 0.5 seconds to 1 month. The 2 alarm interrupt circuits generate interrupt signals at preset times. As the oscillation circuit is driven under constant voltage, fluctuation of the oscillator frequency due to supply voltage is small, and the time keeping current is small (TYP. 0.35A at 3V: Rx5C348A, TYP.0.55A at 3V: Rx5C348B). The oscillation halt sensing circuit can be used to judge the validity of internal data in such events as power-on The supply voltage monitoring circuit is configured to record a drop in supply voltage below two selectable supply voltage monitoring threshold settings. The 32.768kHz clock output function (N-channel open drain output) is intended to output sub-clock pulses for the external microcomputer. The 32-kHz clock circuit can be disabled by certain register settings for the Rx5C348A but cannot be disabled by any register settings for the Rx5C348B. The oscillation adjustment circuit is intended to adjust time counts with high precision by correcting deviations in the oscillation frequency of the crystal oscillator. These models come in an ultra-compact SSOP10 (RS5C348A/B), SSOP10G (RV5C348A/B), TSSOP10G (RT5C348B) Package 32-kHz Clock Output RS5C348A SSOP10 (Pin Pitch 0.5mm, Height1.25mm, Controllable by command RS5C348B 6.4mm3.5mm) Keeping output enabled RV5C348A SSOP10G (Pin Pitch 0.5mm, Height1.2mm, Controllable by command RV5C348B 4.0mm2.9mm) Keeping output enabled RT5C348B TSSOP10G (Pin Pitch 0.5mm, Height0.85mm, Keeping output enabled 4.0mm2.9mm) FEATURES Timekeeping supply voltage ranging from 1.45 to 5.5V Low power consumption Rx5C348A: 0.35 A TYP (0.8A MAX) at VDD=3V Rx5C348B: A T0.55YP (1.0A MAX) at VDD=3V Only four signal lines (CE, SCLK, SI, and SO) required for connection to the CPU. Maximum clock frequency of 2 MHz (with VDD = 5V) Time counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days, and weeks) (in BCD format) Interrupt circuit configured to generate interrupt signals (with interrupts ranging from 0.5 seconds to 1 month) to the CPU and provided with an interrupt flag and an interrupt halt 2 alarm interrupt circuits(Alarm W for week, hour, and minute alarm settings and Alarm D for hour and minute alarm settings) 32-kHz clock output circuit (Nch. open drain output) The Rx5C348A is designed to disable 32-kHz clock output in response to a command from the host computer and the Rx5C348B is designed to keep 32-kHz output enabled. Oscillation halt sensing circuit which can be used to judge the validity of internal data Supply voltage monitoring circuit with two supply voltage monitoring threshold settings Automatic identification of leap years up to the year 2099 Selectable 12-hour and 24-hour mode settings Built-in oscillation stabilization capacitors (CG and CD) High precision oscillation adjustment circuit Ultra-compact SSOP10 (RS5C348A/B), SSOP10G (RV5C348A/B), TSSOP10G (RT5C348B) CMOS process 12345 - 1 - RT5C348B (TSSOP10G) and RS5C348B (SSOP10) are the discontinued products. As of July in 2016. Rx5C348A/B PIN CONFIGURATION Rx5C348A/B 10 32KOUT VDD 1 9 SCLK OSCIN 2 3 8 SO OSCOUT 4 7 SI CE 56 VSS /INTR TOP VIEW BLOCK DIAGRAM ALARM W REGISTER 32kHz COMPARATOR W (MIN,HOUR, WEEK) 32KOUT VDD OUTPUT CONTROL VOLTAGE ALARM D REGISTER DETECT COMPARATOR D (MIN,HOUR) OSCIN TIME COUNTER DIVIDER DIV OSC CORREC (SEC,MIN,HOUR,WEEK,DAY,MONTH,YEAR) VSS -TION OSCOUT SCLK ADDRESS OSC ADDRESS I/O REGISTER DETECT DECODER SI CONTROL SO /INTR CE INTERRUPT CONTROL SHIFT REGISTER 12345 - 2 -