NR8576 Datasheet, PDF (1/11 Pages) Nippon Precision Circuits Inc – Real-time Clock Modules

NR8576 series
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 32.768kHz/1Hz select out-
put function is incorporated for independent hardware control. They are available in compact 14-pin SOPs
(NR8576A×) and miniature 18-pin SOPs (NR8576B×).
FEATURES
I Crystal oscillator element built-in for adjustment-
free use
I Timer counters for second, minute, hour, day, day
of the week, month, and year
I 2.5 to 5.5V operating voltage range
I 1.7 ± 0.3V supply voltage detection threshold
PINOUTS
I 1.0µA at 3.0V (typ) current consumption
I Automatic leap-year calendar adjustment
I 32.768kHz and 1Hz output selectable
I Package
• 14-pin SOP (NR8576A×)
• 18-pin SOP (NR8576B×)
14-pin SOP
18-pin SOP
VSS 1
NC 2
CE 3
FSEL 4
WR 5
FOE 6
NC 7
14 FOUT
13 NC
12 NC
11 DATA
10 CLK
9 VDD
8 NC
PACKAGE DIMENSIONS (Unit: mm)
14-pin SOP
NC 1
NC 2
NC 3
NC 4
FOE 5
WR 6
FSEL 7
CE 8
VSS 9
18-pin SOP
18 NC
17 NC
16 NC
15 NC
14 VDD
13 NC
12 CLK
11 DATA
10 FOUT
10.1 0.2
0 10
11.4 0.2
0 10
0.15
1.27
0.35 0.1
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
0.15
1.27
0.4 0.1
SEIKO NPC CORPORATOIN—1