NJU6355 Datasheet | New Japan Radio

SERIAL I/O REAL TIME CLOCK s GENERAL DESCRIPTION The NJU6355 series is a serial I/O real time clock suitable for 4 bits microprocessor. It contains quartz crystal oscillator, counter, shift register, voltage regulator, voltage detector and interface controller. The NJU6355 series required only 4-port of microprocessor for data transfer, and the microprocessor can receive the data at any time when the microprocessor requires. The operating voltage is as wide as 2.0V to 5.5V, consequently, the NJU6355 series can count accurate time data even if the back up period. Furthermore, the long time back up is available as the operating current during the back up period is less than 3u A(TYP). s Features q Low Operating Voltage q Low Operating Current s PACKAGE OUTLINE NJU6355ED NJU6355EM s PIN CONFIGURATION I/O XT XT VSS VDD DATA CLK CE 2.0 to 3.6V 3.0u A (TYP) @2.0V 3.0u A (TYP) @3.0V 4.0u A (TYP) @5.0V q BCD Counts of Seconds, Minutes, Hours, Days of Week Day, Month and Year q Required only 4-port DATA, CLK, CE and I/O q Low Battery Detector Low Voltage Alarm Signal Output q Automatic Leap Year pensation Up to AD 2099 q Package Outline DIP8 / DMP8 q C-MOS Technology s LINE-UP TABLE Type No. Output Data NJU6355 E Seconds, Minutes, Hours, Days of Week, Day, Month, Year Oscillation Capacitor Cd=21p F / Cg=21p F on Chip s BLOCK DIAGRAM XT XT Oscillator Divider Timer Counter Sec. Min. Hr. Days of W eek Day Month Year Sec. Min. Hr. Days of W eek Day Month Year DATA Shift Register I/O V SS V DD Controller & Clock Counter Voltage Detector CLK CE -1- NJU6355 s TREMINAL DESCRIPTION No. SYMBOL FUNCTION I/O Input/Output Select Terminal for DATA Terminal 1 "H" : Input, "L" : Output During the CE terminal is "L", the DATA terminal is high impedance. Quartz Crystal Connecting Terminal (f=32.768k Hz) 2 XT Refer to the line-up table for internal Cg, Cd value. XT 3 Chip Enable Input Terminal (with Pull-down Resistance) "H" : DATA input/output is available. 5 CE "L" : DATA...