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NR8576AB Schematic ( PDF Datasheet ) - Nippon Precision Circuits Inc

Teilenummer NR8576AB
Beschreibung Real-time Clock Modules
Hersteller Nippon Precision Circuits Inc
Logo Nippon Precision Circuits Inc Logo 




Gesamt 10 Seiten
NR8576AB Datasheet, Funktion
NIPPON PRECISION CIRCUITS INC.
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 cir-
cuits 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×).
FEATURES
s Crystal oscillator element built-in for adjustment-
free use
s Timer counters for second, minute, hour, day, day
of the week, month, and year
s 2.5 to 5.5 V operating voltage range
s 1.7 ± 0.3 V supply voltage detection threshold
s 1.0 µA at 3.0 V (typ) current consumption
s Automatic leap-year calendar adjustment
s 32.768 kHz and 1 Hz output selectable
s Package
• 14-pin SOP (NR8576A×)
• 18-pin SOP (NR8576B×)
SERIES CONFIGURATION
PINOUTS
14-pin SOP
VSS 1
N.C 2
CE 3
FSEL 4
WR 5
FOE 6
N.C 7
18-pin SOP
N.C 1
N.C 2
N.C 3
N.C 4
FOE 5
WR 6
FSEL 7
CE 8
VSS 9
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
14 FOUT
13 N.C
12 N.C
11 DATA
10 CLK
9 VDD
8 N.C
18 N.C
17 N.C
16 N.C
15 N.C
14 VDD
13 N.C
12 CLK
11 DATA
10 FOUT
NIPPON PRECISION CIRCUITS—1






NR8576AB Datasheet, Funktion
Timing Diagrams
Data read
WR
CE
CLK
DATA
Data write
tWRS
t tCES CLK
t tCLKH CLKL
tDATD
WR
CE
CLK
DATA
tWRS
t tCES CLK
t tCLKH CLKL
t tSD HD
NR8576 Series
tCE
t tf1 r1
tCE
t tf1 r1
tWRH
t tCEH
RCV
tDZ
tWRH
t tCEH
RCV
NIPPON PRECISION CIRCUITS—6

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