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參數(shù)資料
| 型號： | BQ3285LS |
| 英文描述： | Real-Time Clock |
| 中文描述： | 實時時鐘 |
| 文件頁數(shù)： | 12/26頁 |
| 文件大?。?/td> | 831K |
| 代理商： | BQ3285LS |
12
bq3285EC/LC
July 1996
Recommended DC Operating Conditions—bq3285EC
(T
A
= T
OPR
)
Symbol
Parameter
Minimum
Typical
Maximum
Unit
V
CC
Supply voltage
4.5
5.0
5.5
V
V
SS
Supply voltage
0
0
0
V
V
IL
Input low voltage
-0.3
-
0.8
V
V
IH
Input high voltage
2.2
-
V
CC
+ 0.3
V
V
BC
Backup cell voltage
2.4
-
4.0
V
Note:
Typical values indicate operation at T
A
= 25°C.
Recommended DC Operating Conditions—bq3285LC
(T
A
= T
OPR
)
Symbol
Parameter
Minimum
Typical
Maximum
Unit
V
CC
Supply voltage
2.7
3.0
5.5
V
V
SS
Supply voltage
0
0
0
V
V
IL
Input low voltage
-0.3
-
0.6
V
V
IH
Input high voltage
2.2
-
V
CC
+ 0.3
V
V
BC
Backup cell voltage
2.4
-
4.0
V
Note:
Typical values indicate operation at T
A
= 25°C.
Crystal Specifications—bq3285EC/LC (DT-26 or Equivalent)
Symbol
Parameter
Minimum
Typical
Maximum
Unit
f
O
C
L
T
P
k
Oscillation frequency
-
32.768
-
kHz
Load capacitance
-
6
-
pF
Temperature turnover point
20
25
30
°C
Parabolic curvature constant
-
-
-0.042
ppm/°C
Q
Quality factor
40,000
70,000
-
R
1
C
0
C
0
/C
1
D
L
f/f
O
Series resistance
-
-
45
K
pF
Shunt capacitance
-
1.1
1.8
Capacitance ratio
-
430
600
Drive level
-
-
1
μ
W
ppm
Aging (first year at 25°C)
-
1
-
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