RTC72423 Seiko, RTC72423 Datasheet
RTC72423
Manufacturer Part Number
RTC72423
Description
4-bit real time clock module
Manufacturer
Seiko
Datasheet
1.RTC72423.pdf
(2 pages)
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77
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
Built-in crystal unit allows adjustment-free efficient operation.
ALE input terminal available for 8048, 8051, and 8085 series.
12/24 h 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
DC characteristics
Frequency characteristics and current consumption
characteristics
Item
Item
Item
Item
(1)
(2)
Symbol
I
Symbol
V
V
V
V
V
I
I
V
OFFLK
V
Symbol
Symbol
C
LK1
LK2
OL1
OL2
T
T
IH1
IL1
IH2
IL2
OH
V
V
1
T
S.R.
t
I
I
STG
SOL
V
V
DD
I/O
CDR
f/fo
fa
DD1
DD2
OPR
t
DD
DH
R
I
I
V
Condition
V
I
OL
OL
V
frequency 1 MHz
OH
DD
1
1
=V
=2.5 mA
=2.5 mA
=2 to 5.5 V
Ta=+25 °C
=-400 µA
=V
V
CS
Input
Refer to the data
holding timing
Three drops on a
hard board from 750 mm
or 29400 m/s
1/2 sine wave x 3 directions
Exclude input/
output current
(+25 °C reference temperature)
RTC-72421
RTC-72423
RTC-72421
RTC-72423
—
Ta=+25 °C
Ta=+25 °C
DD
Condition
V
DD
DD
-10 °C to +70 °C
RTC-72421
RTC-72423
DD
1
/0 V
/0 V
=5 V
=0 V
Condition
=5 V, Ta=+25 °C,
Condition
first year
2
4/5 V
Min.
x 0.3 ms x
2.2
2.4
V
V
—
—
72421 A
72421 B
72423 A
—
72423
DD
DD
DD
=5 V
=2 V
Under +260 °C within 10 s
(lead part) (package should
be less than +150 °C)
Twice at under +260
s or under +230
Typ.
GND -0.3 to V
10
20
—
—
Specifications
-55 to +125
-0.3 to 7.0
-55 to +85
1/5 V
Max.
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 Max.
+10/-120
DD
±5 Max.
10 Max.
°
5 Max.
C within 3 min.
±10
±50
±20
±50
°
Unit
C within 10
µA
µA
pF
V
V
V
DD
+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
x 10
x 10
x 10
Unit
0
0
Unit
Unit
°C
°C
µs
µA
V
to D
to D
1
V
V
-6
/year
3
3
-6
-6
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
1.27
RTC72423 A
EPSON 6150
16
21
3
4
RTC72421 A
EPSON 5053C
2.54
20
5
15
4
19
16.3 Max.
6
14
23.1 Max.
5
Actual size
18
7
13
6
17
0.35
8
0.65 Max.
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
V
CS
ALE
RD
CS
A
A
A
A
D
D
D
D
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
ALE
WR
CS
V
CS
NC
NC
NC
NC
NC
RD
D
D
D
D
NC
A
A
A
A
DD
DD
DD
3
2
1
0
1
2
3
0
1
0
)
)
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RTC72423 Summary of contents
Page 1
... are to have the same level of voltage Do not connect it to any external terminals 23.1 Max. RTC72421 A EPSON 5053C 7. 105 2.54 0.65 Max. 16.3 Max. RTC72423 A EPSON 6150 0 to 0.05 Min. 10 1.27 0.35 2.8 Max. No. 72423 1 STD ALE ...
Page 2
Register table Data Count Value ...