NR8576BA

NR8576 Series NIPPON PRECISION CIRCUITS INC. Real-time Clock Modules OVERVIEW The NR8576 Series devices are serial-interface type real-time clock module ICs with built-in crystal oscillator elements. They feature timer counter circuits that keep track of time from the current second to the current year, automatic leap-year adjustment, and a supply voltage detect function. Also, a 32.768 kHz/1 Hz select output function is incorporated for independent hardware control. They are available in compact 14-pin SOPs (NR8576A×) and miniature 18-pin SOPs (NR8576B×). PINOUTS 14-pin SOP VSS N.C CE FSEL WR FOE N.C 1 2 3 4 5 6 7 14 13 12 11 10 9 8 FOUT N.C N.C DATA CLK VDD N.C NR8576A FEATURES s s s s s s s s Crystal oscillator element built-in for adjustmentfree use Timer counters for second, minute, hour, day, day of the week, month, and year 2.5 to 5.5 V operating voltage range 1.7 ± 0.3 V supply voltage detection threshold 1.0 µA at 3.0 V (typ) current consumption Automatic leap-year calendar adjustment 32.768 kHz and 1 Hz output selectable Package 14-pin SOP (NR8576A×) 18-pin SOP (NR8576B×) 18-pin SOP N.C N.C N.C N.C FOE WR FSEL CE VSS 1 18 N.C N.C N.C N.C VDD N.C CLK DATA FOUT NR8576B 2 3 4 5 6 7 8 9 17 16 15 14 13 12 11 10 SERIES CONFIGURATION Device NR8576AA NR8576AB NR8576BA NR8576BB Package 14-pin SOP 14-pin SOP 18-pin SOP 18-pin SOP Frequency deviation 5 ± 12 ppm 5 ± 23 ppm 5 ± 12 ppm 5 ± 23 ppm NIPPON PRECISION CIRCUITS—1 NR8576 Series PACKAGE DIMENS...