鈥?/div>
Builtin crystal unit allows adjustment-free efficient operation.
ALE input terminal available for 8048, 8051, and 8085 series.
12/24H clock switchover function and automatic leap year setting.
Interrupt masking.
30 second adjustment function.
Low current consumption and features a backup function.
Actual size
Specifications (characteristics)
Absolute Max. rating
Symbol
Item
V
DD
Power source voltage
V
I/O
Input and output voltage
Storage temperature
T
STG
Condition
Ta=25藲C
Ta=25藲C
RTC-72421
RTC-72423
RTC-72421
Soldering condition
T
SOL
RTC-72423
Specifications
-0.3 to 7.0
GND -0.3 to V
DD
+0.3
-55 to +85
-55 to +125
Under 260藲C within 10 sec.
(lead part) (package should
be less than 150藲C)
Twice at under 260藲C within
10 sec. or under 230藲C
within 3 min.
Terminal connection
Unit
V
藲C
RTC-72421
18 17 16 15 14 13 12 11 10
1
2
3
4
5
6
7
8
9
Operating range
Item
Operating voltage
Operating temperature
Data holding voltage
CSI data holding time
Operation restoring time
Symbol
V
DD
T
OPR
V
DH
t
CDR
t
R
Refer to the data
holding timing
RTC-72421
RTC-72423
Condition
Specifications
4.5 to 5.5
-10 to 70
-40 to 85
2.0 to 5.5
2.0 min.
Unit
V
藲C
V
碌s
RTC-72423
24 23 22 21 20 19 18 17 16 15 14 13
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
72421
STD. P
CS
0
ALE
A
0
A
1
A
2
A
3
RD
GND
WR
D
3
D
2
D
1
D
0
CS
1
(V
DD
)
(V
DD
)
V
DD
1 2 3 4 5 6 7 8 9 10 11 12
(V
DD
) and V
DD
are to have the same level of voltage
.
Do not connect it to any external terminals.
NC is not connected internally.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
72423
STD. P
CS
0
NC
ALE
A
0
NC
A
1
NC
A
2
A
3
RD
GND
WR
D
3
D
2
D
1
NC
NC
D
0
CS
1
NC
(V
DD
)
(V
DD
)
V
DD
Frequency characteristics and current consumption
characteristics
Item
Symbol
Condition
72421 A
Frequency tolerance
鈭唂/fo
Ta=25藲C 72421 B
V
DD
=5V 72423 A
72423
Frequency temperature
characteristics
Aging
Shock resistance
Current consumption
fa
S.R.
I
DD1
I
DD2
(25藲C reference temperature)
V
DD
=5V, Ta=25藲C,
External dimensions
RTC-72421
23.1 max.
(Unit: mm)
Specifications
鹵10
鹵50
鹵20
鹵50
+10/-120
鹵5 max.
鹵10 max.
10 max.
5 max.
Unit
ppm
6.8 max.
RTC72421 A
EPSON 5053C
7.62
0.2 min.
-10 to +70藲C
first year
ppm/Y
ppm
碌A(chǔ)
4.2
0.25
90擄 to
105擄
CS
1
=0V
Exclude input/
output current
V
DD
=5V
V
DD
=2V
Electrical characteristics
Item
鈥淗鈥?input voltage
鈥淟鈥?input voltage
(1)
(1)
Symbol Condition
V
IH1
V
IL1
I
LK1
I
LK2
V
OL1
V
OH
V
OL2
I
OFFLK
C
1
(2)
(2)
V
IH2
V
IL2
I
OL
=2.5mA
I
OH
=
-400碌A(chǔ)
I
OL
=2.5mA
V
1
=V
DD
/0V
frequency 1 MHz
Input
RTC-72423
Min. Typ. Max.
2.2
鈥?/div>
0.8
鹵1
鈥?/div>
鈥?/div>
Unit
V
碌A(chǔ)
Applicable
terminal
鈥?/div>
V
1
=V
DD
/0V
All inputs
other than
CS
1
Input other
than D
0
to D
3
16.3 max.
Input leak current (1)
Input leak current (2)
鈥淟鈥?output voltage (1)
鈥淗鈥?output voltage
鈥淟鈥?output voltage (2)
Off leak current
Input capacity
鈥淗鈥?input voltage
0.4
2.4
鈥?/div>
0.4
鈥?/div>
10
20
鈥?/div>
10
碌A(chǔ)
pF
V
V
D
0
to D
3
STD.P
Input other
than D
0
to D
3
7.9
鹵10
RTC72423 A
EPSON 6150
12.2 max.
2.5
3.3 min.
Three drops on a
hard board from 75 cm
or 3000G x 0.3ms x
1/2 sine wave x 3 directions
2.8 max.
65
鈥淟鈥?input voltage
V
DD
=2 to 5.5V
4/5 V
DD
鈥?/div>
鈥?/div>
1/5 V
DD
CS
1
0.3
D
0
to D
3
0.2
0.05 min.
0擄 to
10擄
1.0
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