RTC-72421_15 Datasheet, PDF (1/2 Pages) Epson Company – REAL TIME CLOCK MODULE (4-bit)

Real time clock module
REAL TIME CLOCK MODULE (4-bit)
RTC - 72421
RTC - 72423
Built-in crystal unit allows adjustment-free efficient operation.
24 h /12 h changeable and leap year automatically adjustable
(Gregorian calendar).
Actual size
RTC-72421
Product Number (Please contact us)
RTC-72421 : Q42724212xxxx00
RTC-72423 : Q42724232xxxx00
RTC-72423
Block diagram
D3
D2
D1
D0
WR
RD
A3
A2
A1
A0
CS0
ALE
CS1
Gate
Gate
OSC
Counter
RESET STOP
bit
bit
30 sec ADJ
bit
HOLD BUSY
bit
bit
S1 S10
M I1 M I10
RTC-72421/72423
24/12
bit
H1 H10
W
Latch
S1 to
CF
D e c o de r
D1 D10
MO1 MO10
Y1 Y10
Output
Selector
64 Hz
1 Second carry
CD
CE
CF
1 M inute carry
1 Hour carry
S TD .P
Terminal connection/External dimensionsç
(Unit:mm)ç
RTC-72421 (DIP 18-pin)
23.1 Max.
#18
#10
RTC72421 A
EPSON 1234A
#1
#9
No. Pin
term in al
1 STD.P
2 /CS0
3 ALE
4 A0
5 A1
6 A2
7 A3
8 /RD
9 GND
7.62
No. Pin
term in al
18 VDD
17 (VDD)
16 (VDD)
15 CS1
14 C0
13 D1
12 D2
11 D3
10 /W R
RTC-72423 (SOP 24-pin)
16.3 Max.
#24
#13
R T C 672 4 2 3
EPSON 1234A
#1
#12
No. Pin
t erm inal
1 STD.P
2 /CS0
3 N.C.
4 ALE
5 A0
6 N.C.
7 A1
8 N.C.
9 A2
10 A3
11 /RD
12 GND
No. Pin
t erm inal
24 VDD
23 (VDD)
22 (VDD)
21 N.C.
20 CS1
19 D0
18 N.C.
17 N.C.
16 D1
15 D2
14 D3
13 /W R
1.52
0.46
2.54
0.2 4.2
Min. Max.
3.3
Min.
0 -15
0.2
2.8 Max.
0.25
1.27
0.35
0.1 Min.
1.0
The metal cas e inside of the molding c ompound may be exposed on the top or bottom of this product.
This purely cos metic and does not have any effect on quality, reliability or electric al specs.
0 - 10
Specifications (characteristics)
*Refer to application manual for details.
Absolute Max. rating
DC characteristics
Item
Symbol Conditions
Min.
Max.
Unit
Supply voltage VDD Ta=+25 C
-0.3
+7.0
V
Input voltage
VI/O
Ta=+25 C GND-0.3 VDD+0.3
Storage
temperature *
TSTG
RTC-72421
RTC-72423
-55
-55
+85
+125
C
*Stored as bare product after unpacking
Operating range
Item
Symbol Conditions
Min.
Max.
Unit
Power voltage VDD
-
4.5
5.5
V
Clock voltage VCLK
-
2.0
5.5
Operating
temperature
TOPR
RTC-72421
RTC-72423
-10
-40
+70
+85
C
Stored as bare produc after unpacking
Frequency characteristics
Item
Symbol
Conditions
Range Unit
72421A
10
Frequency
precision
Frequency
temperature
characteristics
Frequency voltage
characteristics
Aging
f /f
TOP
f/V
fa
Ta=+25 °C
VDD=5.0 V
72421B
72423A
72423B
50
20
50
10^-6
-10 C to +70 C (+25 C) +10 / -120
-40 C to +85 C(+25 C) +10 / -220
Ta=+25 C,VDD=2.0 V to 5.5 V 5.0 Max. 10^-6/V
Ta=+25 C,VDD=5.0 V,First year 5.0 Max. 10^-6/year
Item
Current consumption
HIGH input voltage (1)
LOW input voltage (1)
LOW output voltage (1)
Symbol
IDD1
IDD2
VIH1
VIL1
VOL1
Conditions
CS1= 0 V VDD=5 V
Exclude input/
output current ^{VDD=2 V}
-
IOL=2.5 mA
HIGH output voltage
VOH
IOH=-400 µA
Min.
-
2.2
-
-
2.4
Typ. Max. Unit Applicable terminal
1
10
-
0.9
5
A
-
-
0.8
V
All inputs other than
CS1
0.4
-
-V
D0 to D3
LOW output voltage (2) VOL2
OFF leak current
IOFFLK
Input capacity
C1
HIGH input voltage (2) VIH2
LOW input voltage (2) VIL2
Input leak current (1)
ILK1
Input leak current (2)
ILK2
IOL=2.5 mA
V1=VDD/0 V
Input frequency
1 MHz
VDD=2.0 V to 5.5 V
V1=VDD/0 V
0.4
10/-10 A
-
10
20
- ^pF
4/5 VDD
-
V
1/5 VDD
-
1/-1 A
-
10/-10
STD.P
Input other than
D0 to D3
D0 to D3, STD.P
CS1
Input other than
D0 to D3
D0 to D3