NR8576 Series
NIPPON PRECISION CIRCUITS INC.
Real-time Clock Modules
OVERVIEW
The NR8576 Series devices are serial-int...
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...