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-62423
RTC-62421
Block diagram
OSC
D3
D2
D1
D0
Ga t e
WR
RD
Ga t e
A3
A2
A1
A0
CS 0
Co un t er
L a tch
RE SE T
b it
3 0 s ec A DJ
b it
S TOP
b it
HO L D
b it
BUS Y
b it
2 4/ 1 2
bi t
S1
S1 0
M I1
M I10
H1
D1
D1 0
M O1 M O1 0
Y1
W
H1 0
Y10
S1 t o CF
O ut p ut
S e le cto r
De co de r
VDD
ALE
CD
CE
S TD.P
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
CS 1
CF
Terminal connection/External dimensions
(Unit:mm)
RTC-62421 (D IP 18-pin)
R TC-62423 (SOP 24-pin)
#18
1
2
3
4
5
6
7
8
9
#10
EPSO N
6.3
RTC62421 A
1234A
#1
#9
N o.
No.
Pin
terminal
V DD
(V DD )
(V DD )
CS 1
C0
D1
D2
D3
/W R
18
17
16
15
14
13
12
11
10
16.3 Max.
# 24
RTC62423
EPSON 1234A
1234
#1
#12
7.62
0.2 4.2
Min. Max.
1.52
0.46
2.8 Max.
3.3
Min.
1.27
0.25
0° -15°
*Refer to application manual for details.
DC characteristics
Item
Symbol
Condition
Supply voltage
VDD
Ta=+25 °C
Input voltage
VI/O
Ta=+25 °C
Storage
RTC-62421
TSTG
temperature *
RTC-62423
*Stored as bare product after unpacking
Min.
-0.3
GND-0.3
-55
-55
Ma x.
+7.0
VDD+0.3
+85
+125
Unit
V
°C
Condition
Stored as bare product
after unpacking
Frequency
precision
∆f /f
Frequency
temperature
characteristics
Frequency voltage
characteristics
Ma x.
5.5
5.5
Unit
LOW output voltage (2)
V
OFF leak current
Input capacity
-40
+85
°C
HIGH input voltage (2)
Aging
VOH
Range
±10
±50
±20
±50
+10 / -120
+10 / -220
f/V
Ta=+25 °C,VDD=4.5 V to 5.5 V
±5.0 Max.
fa
Ta=+25 °C,VDD=5.0 V,First year
Ta=+25 °C
VDD=5.0 V
Min.
-
IOL=2.5 mA
IOH=-400 µA
2.4
VIH2
Input leak current (1)
ILK1
-
ILK2
Ma x.
30
1.8
0.8
0.4
Unit
-
V
0.4
10/-10
-
×10-6
×10-6/V
±5.0 Max. ×10-6/year
http://www.epsontoyocom.co.jp
V
Applicable terminal
All inputs other than
CS1
D0 to D3
STD.P
µA
pF
Input Pins
CS1
µA
Input other than
D0 to D3
D0 to D3
-
V1=VDD/0 V
µA
V
5
4/5 VDD
VIL2
Input leak current (2)
Unit
Typ.
15
1
2.2
-
-
VOL2
IOL=2.5 mA
IOFFLK
V1=VDD/0 V
C1
Input frequency 1 MH z
LOW input voltage (2)
Condition
Condition
VDD=5 V
VDD=2 V
CS1= 0 V
VDD=2.0 V to 5.5 V
62421A
62421B
62423A
62423
-10 °C to +70 °C (+25 °C)
-40 °C to +85 °C(+25 °C)
TOP
Symbol
IDD1
IDD2
HIGH input voltage (1)
VIH1
LOW input voltage (1)
VIL1
LOW output voltage (1) VOL1
Min.
4.5
2.0
Frequency characteristics
Symbol
Item
Current consumption
HIGH output voltage
Operating range
Item
Pin
terminal
VDD
(V D D)
(V D D)
N .C .
C S1
D0
N .C .
N .C .
D1
D2
D3
/WR
0° - 10°
1.0
0.35
Specifications (characteristics)
TOPR
24
23
22
21
20
19
18
17
16
15
14
13
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.
Absolute Max. rating
Symbol
VDD
VCLK
No.
0.2
0.1 Min.
2.54
Item
Power voltage
Clock voltage
Operating
temperature
Pin
terminal
STD .P
/CS 0
N .C .
ALE
A0
N .C .
A1
N .C .
A2
A3
/RD
GN D
1
2
3
4
5
6
7
8
9
10
11
12
#13
7.9
23.1 Max.
Pin
terminal
STD.P
/C S 0
ALE
A0
A1
A2
A3
/R D
GN D
12.2 Max.
No.
1/5 VDD
-
1/-1
10/-10
