NJU6350
NJU6350 is SERIAL I/O REAL TIME CLOCK manufactured by New Japan Radio.
SERIAL I/O REAL TIME CLOCK s GENERAL DESCRIPTION
The NJU6350 is a serial I/O Real Time Clock suitable for 4 bits micro-processor. It contains quartz crystal oscillator, counter, shift register, voltage regulator, voltage detector, and interface controller. The NJU6350 required only 3-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 NJU6350 can count accurate time data even if the back up period. Furthermore, the long time back up is available as the current consumption during the back up period is less than 2µA. NJU6350R NJU6350C s PACKAGE OUTLINE s Features q Operating Voltage : 3.0V ± 20% 2.0V to 5.5V ( The clock operation ) q Low operating current : 0.8 µA ( Typ. ) at 2.0V 2.0 µA ( Max. ) at 2.0V q BCD Counts of Seconds, Minutes, Hours, Days of Week, Date, Month and Year q q q q q Required only 3-port ( DATA, CLK and CE ) Low Battery Detector ( Low voltage alarm signal output ) Automatic Leap Year pensation : Up to AD 2099 Package Outline C-MOS Technology : VSP 8 / Chip s PIN CONFIGURATION
FOUT 1 XT XT 2 3
8 XDD 7 DATA 6 CLK 5 CE
VSS 4
NJU6350 s BLOCK DIAGRAM
Fout XT XT V SS V DD Low Voltage Detector Controller Oscillator Divider Timer Counter hour day date sec. min. month year
DATA
CLK CE s TERMINAL DESCRIPTION
No. 1
SYMBOL Fout
I/O O
2 3 4 5
XT XT VSS CE
I O Power I
FUNCTION Oscillator output terminal. ON :It outputs oscillator signal , frequency 32.768k Hz. OFF :It is in high impedance status. Quartz crystal connect terminal ( f = 32.768k Hz ). GND Chip enable terminal ( With pull-down resistor ). " H " : Data input/output available " L " : Data terminal is in high impedance status. When the data input/output is executed consequently, the CE terminal should be set to " L " level at the data transmission interval. Clock terminal. The Data Input/Output is synchronized by this...
