RTC72421A Seiko, RTC72421A Datasheet
RTC72421A
Manufacturer Part Number
RTC72421A
Description
Manufacturer
Seiko
Datasheet
1.RTC72421A.pdf
(2 pages)
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Quantity
Price
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RTC72421A
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Quantity:
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RTC72421A
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65
Real time clock module
RTC-72421/72423
•
•
•
•
•
•
4-bit REAL TIME CLOCK MODULE
Power source voltage
Input and output voltage
Storage temperature
Soldering condition
“H” input voltage (1)
“L” input voltage
Input leak current (1)
Input leak current (2)
“L” output voltage (1)
“H” output voltage
“L” output voltage (2)
Off leak current
Input capacity
“H” input voltage (2)
“L” input voltage
Operating voltage
Operating temperature
Data holding voltage
CSI data holding time
Operation restoring time
Frequency tolerance
Frequency temperature
characteristics
Aging
Shock resistance
Current consumption
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.
Specifications (characteristics)
Absolute Max. rating
Operating range
Electrical characteristics
Frequency characteristics and current consumption
characteristics
Item
Item
Item
Item
(1)
(2)
Symbol
I
Symbol
V
V
V
V
V
OFFLK
V
V
I
I
Symbol
Symbol
C
LK1
LK2
IH1
OL1
OL2
IH2
T
T
IL1
OH
IL2
V
V
S.R.
1
T
V
V
t
I
I
STG
SOL
DD
I/O
CDR
DD1
DD2
t
f/fo
fa
OPR
DD
DH
R
I
V
I
I
V
V
Condition
OL
OH
OL
frequency 1 MHz
DD
1
1
=V
=V
=2.5mA
=
=2.5mA
=2 to 5.5V
Ta=25˚C
(25˚C reference temperature)
Input
Refer to the data
holding timing
Three drops on a
hard board from 75 cm
or 3000G x 0.3ms x
1/2 sine wave x 3 directions
CS
Exclude input/
output current
V
RTC-72421
RTC-72423
RTC-72421
RTC-72423
-400µA
—
Condition
DD
DD
DD
Ta=25˚C
Ta=25˚C
RTC-72421
RTC-72423
V
1
Condition
=5V
-10 to +70˚C
DD
/0V
/0V
=0V
Condition
=5V, Ta=25˚C,
first year
4/5 V
Min.
2.2
2.4
V
V
—
—
72421 A
72421 B
72423 A
—
72423
DD
DD
DD
=5V
=2V
Under 260˚C within 10 sec.
(lead part) (package should
be less than 150˚C)
Twice at under 260˚C within
10 sec. or under 230˚C
within 3 min.
Typ.
GND -0.3 to V
10
20
—
—
Specifications
-55 to +125
-0.3 to 7.0
-55 to +85
Max.
1/5 V
Specifications
±10
0.8
0.4
0.4
Specifications
—
±1
—
10
—
4.5 to 5.5
2.0 to 5.5
-10 to 70
-40 to 85
2.0 min.
+10/-120
±10 max.
DD
±5 max.
10 max.
5 max.
±10
±50
±20
±50
Unit
µA
µA
pF
DD
V
V
V
+0.3
All inputs
other than
CS
Input other
than D
Input other
than D
Applicable
D
D
terminal
STD.P
1
0
0
CS
to D
to D
ppm/Y
Unit
Unit
ppm
ppm
0
0
Unit
µs
˚C
˚C
µA
to D
to D
V
1
V
V
3
3
3
3
(V
NC is not connected internally.
Terminal connection
External dimensions
DD
RTC-72421
RTC-72423
) and V
RTC-72421
RTC-72423
24
1
18
1
23
DD
2
17
are to have the same level of voltage
2
22
3
RTC72423 A
EPSON 6150
16
21
3
4
RTC72421 A
EPSON 5053C
20
5
15
4
19
16.3 max.
6
14
23.1 max.
5
Actual size
18
7
13
6
17
8
12
16
7
9
15
10
11
8
0.05 min.
14
11
10
9
13
12
.
Do not connect it to any external terminals.
2.8 max.
No.
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
0 to
10
72421
STD. P
GND
( V
( V
WR
ALE
RD
CS
V
CS
A
A
A
D
D
D
D
A
DD
DD
DD
0
1
2
3
2
1
0
3
1
0
90 to
105
)
)
7.62
No.
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
1.0
(Unit: mm)
0.25
72423
STD. P
( V
( V
GND
WR
V
CS
ALE
NC
NC
NC
CS
NC
RD
D
D
D
D
NC
NC
A
A
A
A
DD
DD
DD
1
3
2
1
0
2
3
0
1
0
)
)
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RTC72421A Summary of contents
Page 1
Real time clock module 4-bit REAL TIME CLOCK MODULE RTC-72421/72423 • 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. • ...
Page 2
Register table Data Count Value ...