參數(shù)資料
型號(hào)： UPD4991A
廠商： NEC Corp.
英文描述： 4-BIT PARALLEL I/O CALENDAR CLOCK
中文描述： 4位并行I / O日歷鐘
文件頁(yè)數(shù)： 24/32頁(yè)
文件大?。?/td> 133K
代理商： UPD4991A
μ
PD4991A
24
.
Oscillation characteristics
Figs. 11 and 12 show the frequency stability when the ambient temperature (T
a
) and supply voltage (V
DD
) are
changed with a crystal of crystal impedance C
1
.
and a circuit shown in Fig. 10.
The stability and day difference are calculated by the following expressions:
Stability =
f – f
reference value
f
reference value
×
10
6
(ppm)
Note
f
reference value
in Fig. 12 is the measured frequency when
V
DD
= 3.5 V.
1
1
Day difference =
TP1 specified
frequency
–
measured
fequency
×
2
number of division stage
×
60 seconds
×
60 minutes
×
24 hours (sec)
Note
The number of division stages = 11 at 2048 Hz.
Fig. 10 Oscillation Characteristics Measuring Circuit
Fig. 11 Frequency Stability
vs. Temperature Characteristics
Fig. 12 Frequency Stability
vs. Supply Voltage Characteristics
TP1
V
DD
V
SS
C
R
X
IN
C
G
X
OUT
C
D
X'
tal
In constant temperature bath
R
C
X'
tal
: 10 k
: Tantalum capacitor (10 F)
: MX-38T
(Nippon Denpa Kogyo)
8.4
4.2
0
4.2
8.4
12.7
16.9
D
(
97.7
48.8
0
–48.4
–97.7
–146.5
–195.3
S
(
2048.2
2048.1
2048.0
2047.9
2047.8
2047.7
2047.6
F
(
2047.5
2048.3
–40
–20
0
40
60
80 (
°
C)
C
D
= C
G
= 10 pF
20 pF
30 pF
Temperature
V
DD
= 5.0 V
–30
–10
20 30
50
70
10
1.73
1.30
0.86
0.43
0
0.43
0.86
1.30
D
20
15
10
5
0
5
10
15
F
2
4
5
6
3
C
P
= 20 pF
C
G
= 10 pF
C
G
= 20 pF
C
G
= 30 pF
Supply voltage
V
DD
(V)
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