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SM8577B Datasheet, PDF (5/10 Pages) Nippon Precision Circuits Inc – Real-time Clock IC
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SM8577B
AC Characteristics
VDD = 5 V ± 10%, VSS = 0 V, Ta = −40 to 85 °C, CL = 50 pF unless otherwise noted
Parameter
CLK clock period
CLK LOW-level pulsewidth
CLK HIGH-level pulsewidth
CE setup time
CE hold time
CE enable time
Write data setup time
Write data hold time
DATA output delay time
DATA output floating time
Clock rise time
Clock fall time
FOUT rise time
FOUT fall time
FOUT duty cycle
Wait time
Symbol
Condition
Rating
Unit
min
max
min
tCLK
0.75
–
7800
µs
tCLKL
0.375
–
3900
µs
tCLKH
0.375
–
3900
µs
tCES
0.375
–
3900
µs
tCEH
0.375
–
–
µs
tCE
–
–
0.9
s
tSD
0.1
–
–
µs
tHD
0.1
–
–
µs
tDATD
–
–
0.2
µs
tDZ
See measurement circuit.
–
–
0.1
µs
tr1
–
–
50
ns
tf1
–
–
50
ns
tr2
CL = 30 pF
–
–
100
ns
tf2
CL = 30 pF
–
–
100
ns
Duty
CL = 30 pF, 32 kHz output
40
–
60
%
tRCV
0.95
–
–
µs
VDD = 3 V ± 10%, VSS = 0 V, Ta = −40 to 85 °C, CL = 50 pF unless otherwise noted
Parameter
CLK clock period
CLK LOW-level pulsewidth
CLK HIGH-level pulsewidth
CE setup time
CE hold time
CE enable time
Write data setup time
Write data hold time
DATA output delay time
DATA output floating time
Clock rise time
Clock fall time
FOUT rise time
FOUT fall time
FOUT duty cycle
Wait time
Symbol
Condition
Rating
Unit
min
max
min
tCLK
1.5
–
7800
µs
tCLKL
0.75
–
3900
µs
tCLKH
0.75
–
3900
µs
tCES
0.75
–
3900
µs
tCEH
0.75
–
–
µs
tCE
–
–
0.9
s
tSD
0.2
–
–
µs
tHD
0.1
–
–
µs
tDATD
–
–
0.4
µs
tDZ
See measurement circuit.
–
–
0.2
µs
tr1
–
–
100
ns
tf1
–
–
100
ns
tr2
CL = 30 pF
–
–
200
ns
tf2
CL = 30 pF
–
–
200
ns
Duty
CL = 30 pF, 32 kHz output
40
–
60
%
tRCV
1.9
–
–
µs
NIPPON PRECISION CIRCUITS—5
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