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
OS C
D3
D2
D1
D0
Gate
WR
RD
Gate
A3
A2
A1
A0
CS0
C ounter
Latch
RESET
bit
30 sec A D J
bit
S TOP
bit
HOLD
bit
BUSY
bit
24/12
bit
S1
S 10
M I1
M I10
H1
D1
D 10
M O 1 M O10
Y1
W
H 10
Y10
S 1 to C F
D ecoder
Output
S elec tor
VD D
A LE
CS1
CD
CE
S TD .P
64 H z
1 S ec o nd c arry
1 M inute carry
1 H our carry
CF
Terminal connection/External dimensions
(Unit:mm)
RTC-62421 (DIP 18-pin)
RTC-62423 (SOP 24-pin)
#18
1
2
3
4
5
6
7
8
9
#10
EPSON
6.3
RTC62421 A
1234A
#1
#9
No.
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.
2.54
1.27
0.25
0° -15°
Specifications (characteristics)
Min.
-0.3
GND-0.3
-55
-55
Max.
+7.0
VDD+0.3
+85
+125
Unit
V
°C
Frequency
precision
Frequency
temperature
characteristics
Frequency voltage
characteristics
Aging
Symbol
Condition
Stored as bare product
after unpacking
Max.
5.5
5.5
Unit
LOW output voltage (2)
V
OFF leak current
Input capacity
-40
+85
°C
HIGH input voltage (2)
VOH
Min.
-
IOL=2.5 mA
IOH=-400 μA
2.4
Range
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
VIL2
Input leak current (1)
ILK1
-
ILK2
×10-6
×10-6/V
±5.0 Max. ×10-6/year
http://www.epsontoyocom.co.jp
Unit
-
V
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
-
-
μA
V
5
V1=VDD/0 V
Max.
30
1.8
0.8
0.4
0.4
10/-10
4/5 VDD
VIH2
Input leak current (2)
Unit
Typ.
15
1
2.2
-
-
VOL2
IOL=2.5 mA
IOFFLK
V1=VDD/0 V
C1
Input frequency 1 MHz
LOW input voltage (2)
Condition
Condition
VDD=5 V
VDD=2 V
CS1= 0 V
VDD=2.0 V to 5.5 V
±10
±50
±20
±50
+10 / -120
+10 / -220
TOP
Symbol
IDD1
IDD2
HIGH input voltage (1)
VIH1
LOW input voltage (1)
VIL1
LOW output voltage (1) VOL1
Min.
4.5
2.0
62421A
62421B
Ta=+25 °C
VDD=5.0 V
62423A
62423
-10 °C to +70 °C (+25 °C)
-40 °C to +85 °C(+25 °C)
Δf /f
Item
Current consumption
HIGH output voltage
Frequency characteristics
Item
0° - 10°
1.0
*Refer to application manual for details.
Operating range
TOPR
Pin
terminal
V DD
(V DD )
(V DD )
N.C.
CS 1
D0
N.C.
N.C.
D1
D2
D3
/W R
DC characteristics
Item
Symbol
Condition
Supply voltage
VDD
Ta=+25 °C
Input voltage
VI/O
Ta=+25 °C
RTC-62421
Storage
TSTG
temperature *
RTC-62423
*Stored as bare product after unpacking
Symbol
VDD
VCLK
24
23
22
21
20
19
18
17
16
15
14
13
0.2
0.1 Min.
0.35
No.
Metal may be exposed on the top or bottom of this product. This will not affect any quality, reliability or electrical spec.
Absolute Max. rating
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
GND
1
2
3
4
5
6
7
8
9
10
11
12
#13
7.9
23.1 Max.
Pin
terminal
STD.P
/CS 0
ALE
A0
A1
A2
A3
/RD
GND
12.2 Max.
No.
1/5 VDD
1/-1
10/-10
