Real time clock module
Epson Toyocom
Product Number (Please contact us)
RTC-62421 : Q42624211xxxx00
RTC-62423 : Q42624231xxxx00
4-bit REAL TIME CLOCK MODULE
RTC - 62421
RTC - 62423
•Built-in
crystal unit allows adjustment-free efficient operation.
•24
h /12 h changeable and leap year automatically adjustable
(Gregorian calendar).
•Pins
and functions are compatible with the MSM6242 series.
Actual size
RTC-62421
RTC-62423
Block diagram
OSC
D
3
D
2
D
1
D
0
RE SE T
b it
3 0 s ec A DJ
b it
Co un t er
BUS Y
b it
Ga t e
S TOP
b it
HO L D
b it
2 4/ 1 2
bi t
WR
RD
S1
Ga t e
S1 0
M I1
M I10
H1
H1 0
W
A
3
A
2
A
1
A
0
CS 0
ALE
CS 1
S1 t o CF
L a tch
De co de r
D1
D1 0
M O1 M O1 0
Y1
Y10
O ut p ut
S e le cto r
6 4 Hz
1 S e co n d ca rry
1 M in u te c a rry
1 Ho u r ca rry
V
DD
S TD.P
CD
CE
CF
Terminal connection/External dimensions
RTC-62421 (D IP 18-pin)
No.
23.1 Max.
#18
#10
(Unit:mm)
R TC-62423 (SOP 24-pin)
Pin
terminal
V
DD
(V
DD
)
(V
DD
)
CS
1
C
0
D
1
D
2
D
3
/W R
No.
16.3 Max.
# 24
#13
6.3
RTC62421 A
EPSO N
#1
#9
EPSON 1234A
1234
#1
#12
7.62
0.2 4.2
Min. Max.
3.3
Min.
2.54
0
°
-15
°
0.25
1.27
7.9
1234A
1
2
3
4
5
6
7
8
9
Pin
terminal
STD.P
/C S
0
ALE
A
0
A
1
A
2
A
3
/R D
GN D
N o.
18
17
16
15
14
13
12
11
10
RTC62423
1
2
3
4
5
6
7
8
9
10
11
12
Pin
terminal
STD .P
/CS
0
N .C .
ALE
A
0
N .C .
A1
N .C .
A
2
A
3
/RD
GN D
No.
24
23
22
21
20
19
18
17
16
15
14
13
Pin
terminal
V
DD
(V
D D
)
(V
D D
)
N .C .
C S
1
D
0
N .C .
N .C .
D
1
D
2
D
3
/WR
12.2 Max.
1.52
0.46
2.8 Max.
0.1 Min.
0.35
0.2
0
°
- 10
°
1.0
M etal may be exposed on the top or bottom of th is product. This w ill not affect any quality, relia bility or electrical spec.
Specifications (characteristics)
Absolute Max. rating
Item
Symbol
Condition
Supply voltage
V
DD
T
a
=+25
°C
Input voltage
V
I/O
T
a
=+25
°C
Storage
RTC-62421
T
STG
temperature
*
RTC-62423
*Stored
as bare product after unpacking
Min.
-0.3
GND-0.3
-55
-55
Ma x.
+7.0
V
DD
+0.3
+85
+125
Unit
V
°C
*Refer
to application manual for details.
DC characteristics
Symbol
I
DD1
Current consumption
I
DD2
HIGH input voltage (1)
V
IH1
LOW input voltage (1)
V
IL1
LOW output voltage (1)
V
OL1
HIGH output voltage
V
OH
Item
Condition
V
DD
=5 V
CS
1
= 0 V
V
DD
=2 V
-
I
OL
=2.5 mA
I
OH
=-400
µA
Min.
-
2.2
-
-
2.4
-
5
4/5 V
DD
V
DD
=2.0 V to 5.5 V
LOW input voltage (2)
Typ.
15
1
Ma x.
30
1.8
-
0.8
0.4
-
0.4
10/-10
-
Unit
µA
V
Applicable terminal
-
-
All inputs other than
CS
1
D
0
to D
3
STD.P
Input Pins
CS
1
Input other than
D
0
to D
3
D
0
to D
3
-
Operating range
Item
Power voltage
Clock voltage
Operating
temperature
Symbol
V
DD
V
CLK
T
OPR
Condition
-
-
Stored as bare product
after unpacking
Min.
4.5
2.0
-40
Ma x.
5.5
5.5
+85
Unit
V
°C
V
µA
pF
V
LOW output voltage (2)
OFF leak current
Input capacity
HIGH input voltage (2)
V
OL2
I
OL
=2.5 mA
I
OFFLK
V
1
=V
DD
/0 V
C
1
Input frequency 1 MH z
V
IH2
V
IL2
I
LK1
I
LK2
V
1
=V
DD
/0 V
-
-
-
1/5 V
DD
1/-1
10/-10
Frequency characteristics
Item
Frequency
precision
Frequency
temperature
characteristics
Frequency voltage
characteristics
Symbol
Condition
62421A
62421B
62423A
62423
-10
°C
to +70
°C
(+25
°C)
-40
°C
to +85
°C(+25 °C)
T
a
=+25
°C
V
DD
=5.0 V
T
a
=+25
°C,V
DD
=4.5 V to 5.5 V
T
a
=+25
°C,V
DD
=5.0 V,First year
Range
±10
±50
±20
±50
+10 / -120
+10 / -220
±5.0
Max.
Unit
Input leak current (1)
Input leak current (2)
µA
∆f
/f
×10
-6
T
OP
f/V
fa
×10
-6
/V
Aging
±5.0
Max.
×10
-6
/year
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