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RTC-72421 Datasheet(PDF) 1 Page - Epson Company

Part No. RTC-72421
Description  REAL TIME CLOCK MODULE (4-bit)
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Maker  EPSON [Epson Company]
Homepage  http://www.epsondevice.com
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RTC-72421 Datasheet(HTML) 1 Page - Epson Company

   
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background image
Actual size
Real time clock module
Block diagram
Terminal connection/External dimensions
(Unit:mm)
Specifications (characteristics)
*Refer to application manual for details.
Absolute Max. rating
DC characteristics
Item
Symbol
Conditions
Min.
Max.
Unit
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
Applicable terminal
Supply voltage
VDD
Ta=+25
C
-0.3
+7.0
V
Current consumption
IDD1
CS1= 0 V
Exclude input/
output current
VDD=5 V
-
1
10
A
-
Input voltage
VI/O
Ta=+25
C
GND-0.3
VDD+0.3
IDD2
VDD=2 V
0.9
5
-
Storage
temperature *
TSTG
RTC-72421
-55
+85
C
HIGH input voltage (1)
VIH1
-
2.2
-
-
V
All inputs other than
CS1
RTC-72423
-55
+125
LOW input voltage (1)
VIL1
-
0.8
*Stored as bare product after unpacking
LOW output voltage (1)
VOL1
IOL=2.5 mA
-
0.4
V
D0 to D3
Operating range
HIGH output voltage
VOH
IOH=-400 µA
2.4
-
Item
Symbol
Conditions
Min.
Max.
Unit
LOW output voltage (2)
VOL2
IOL=2.5 mA
-
0.4
STD.P
Power voltage
VDD
-
4.5
5.5
V
OFF leak current
IOFFLK
V1=VDD/0 V
10/-10
A
Clock voltage
VCLK
-
2.0
5.5
Input capacity
C1
Input frequency
1 MHz
10
-
pF
Input other than
D0 to D3
Operating
temperature
TOPR
RTC-72421
-10
+70
C
20
D0 to D3, STD.P
RTC-72423
-40
+85
HIGH input voltage (2)
VIH2
VDD=2.0 V to 5.5 V
4/5 VDD
-
V
CS1
Stored as bare produc after unpacking
LOW input voltage (2)
VIL2
-
1/5 VDD
Frequency characteristics
Input leak current (1)
ILK1
V1=VDD/0 V
-
1/-1
A
Input other than
D0 to D3
Item
Symbol
Conditions
Range
Unit
Input leak current (2)
ILK2
10/-10
D0 to D3
Frequency
precision
f /f
Ta=+25 °C
VDD=5.0 V
72421A
10
10-6
72421B
50
72423A
20
72423B
50
Frequency
temperature
characteristics
TOP
-10
C to +70 C (+25 C)
+10 / -120
-40
C to +85 C(+25 C)
+10 / -220
Frequency voltage
characteristics
f/V
Ta=+25
C,VDD=2.0 V to 5.5 V 5.0 Max. 10-6/V
Aging
fa
Ta=+25
C,VDD=5.0 V,First year 5.0 Max. 10-6/year
OS C
R ESET
bit
STOP
bit
30 sec A D J
bit
C ounter
HO LD
bit
BU SY
bit
D3
D2
D1
D0
WR
RD
A3
A2
A1
A0
CS 0
ALE
CS 1
S 1
S 10
M I1
M I10
H1
H10
W
D1
D10
M O1 M O 10
Y1
Y10
64 H z
1 S ec ond c arry
1 M inute c arry
1 H our c arry
S 1 to
CF
CD
CE
CF
Gate
Gate
Latc h
Decoder
24/12
bit
R T C -72421/72423
STD .P
O utput
Selec tor
RTC-72421
RTC-72423
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).
The metal cas e inside of the molding c ompound m ay be exposed on the top or bottom of this product.
This purely cos metic and does not have any eff ect on quality, reliability or electric al specs.
RTC-72421 (DIP 18-pin)
7.62
0
 -15
0.25
0.46
4.2
Max.
3.3
Min.
0.2
Min.
2.54
1.52
23.1 Max.
#1
#18
#10
#9
RTC72421 A
EPSON
1234A
No.
Pin
terminal
No.
Pin
terminal
1
STD.P
18
VDD
2
/CS0
17
(VDD)
3
ALE
16
(VDD)
4
A0
15
CS1
5
A1
14
C0
6
A2
13
D1
7
A3
12
D2
8
/RD
11
D3
9
GND
10
/W R
RTC-72423 (SOP 24-pin)
1.0
0.2
0
 - 10
0.2
0
 - 10
1.27
0.35
2.8 Max.
0.1 M in.
2.8 Max.
0.1 M in.
#12
#1
16.3 Max.
#24
#13
RTC62423
EPSON 1234A
#12
#1
16.3 Max.
#24
#13
RTC72423
EPSON 1234A
No.
Pin
terminal
No.
Pin
terminal
1
STD.P
24
VDD
2
/CS0
23
(VDD)
3
N.C.
22
(VDD)
4
ALE
21
N.C.
5
A0
20
CS1
6
N.C.
19
D0
7
A1
18
N.C.
8
N.C.
17
N.C.
9
A2
16
D1
10
A3
15
D2
11
/RD
14
D3
12
GND
13
/W R
Product Number (Please contact us)
RTC-72421 : Q42724212xxxx00
RTC-72423 : Q42724232xxxx00


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