RTC-72421 RTC-72423 - Epson Electronic Devices

Real time clock module
Product Number (Please contact us)
RTC-72421 : Q42724212xxxx00
RTC-72423 : Q42724232xxxx00
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
RTC-72423
Block diagram
RTC-72421/72423
OS C
D3
D2
D1
D0
Gate
WR
RD
Gate
A3
A2
A1
A0
CS0
Latch
C ounter
R E S E T STOP
bit
bit
30 sec A D J
bit
S1 to
CF
Decoder
H OLD
bit
BUSY
bit
S1
S10
M I1
D1
D10
M O1 M O10
24/12
bit
M I10
H1
H 10
Y1
Y10
W
Output
S elector
A LE
CS1
CD
CE
CF
STD .P
64 H z
1 S econd carry
1 M inute carry
1 H our carry
Terminal connection/External dimensions
(Unit:mm)
RTC-72423 (SOP 24-pin)
Pin
terminal
STD.P
/CS 0
ALE
A0
A1
A2
A3
/RD
GND
23.1 Max.
#18
1
2
3
4
5
6
7
8
9
#10
EPSON
6.3
RTC72421 A
1234A
#1
#9
No.
18
17
16
15
14
13
12
11
10
Pin
terminal
V DD
(V DD )
(V DD )
CS 1
C0
D1
D2
D3
/W R
No.
16.3 Max.
#24
RTC62423
RTC72423
EPSON 1234A
#1
#12
7.62
0.2 4.2
Min. Max.
1.52
0.46
2.54
2.8 Max.
3.3
Min.
1.27
0.25
0 -15
0.35
0.1 Min.
Specifications (characteristics)
Input voltage
Storage
temperature *
Symbol
VDD
Conditions
Ta=+25 C
Min.
-0.3
Max.
+7.0
VI/O
Ta=+25 C
GND-0.3
VDD+0.3
TSTG
RTC-72421
RTC-72423
-55
-55
+85
+125
Clock voltage
Operating
temperature
Conditions
-
Min.
4.5
Max.
5.5
VCLK
-
2.0
5.5
TOPR
RTC-72421
RTC-72423
-10
-40
+70
+85
Item
V
Current consumption
C
HIGH input voltage (1)
LOW input voltage (1)
VIH1
VIL1
LOW output voltage (1)
VOL1
IOL=2.5 mA
-
HIGH output voltage
VOH
IOH=-400 µA
2.4
LOW output voltage (2)
OFF leak current
VOL2
IOFFLK
IOL=2.5 mA
V1=VDD/0 V
Unit
Frequency
precision
f /f
Frequency
temperature
characteristics
Frequency voltage
characteristics
Aging
TOP
Conditions
72421A
72421B
Ta=+25 °C
VDD=5.0 V
72423A
72423B
-10 C to +70 C (+25 C)
-40 C to +85 C(+25 C)
Range
10
50
20
50
+10 / -120
+10 / -220
Symbol
IDD1
IDD2
V
Input capacity
C
Frequency characteristics
Symbol
0 - 10
1.0
Unit
Stored as bare produc after unpacking
Item
0.2
*Refer to application manual for details.
Operating range
Symbol
VDD
Pin
terminal
V DD
(V DD )
(V DD )
N.C.
CS 1
D0
N.C.
N.C.
D1
D2
D3
/W R
24
23
22
21
20
19
18
17
16
15
14
13
DC characteristics
*Stored as bare product after unpacking
Item
Power voltage
No.
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.
Absolute Max. rating
Item
Supply voltage
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
No.
12.2 Max.
RTC-72421 (DIP 18-pin)
Unit
10-6
f/V
Ta=+25 C,VDD=2.0 V to 5.5 V 5.0 Max. 10-6/V
fa
Ta=+25 C,VDD=5.0 V,First year 5.0 Max. 10-6/year
C1
HIGH input voltage (2)
VIH2
LOW input voltage (2)
VIL2
Input leak current (1)
ILK1
Input leak current (2)
ILK2
Conditions
CS1= 0 V
VDD=5 V
Exclude input/
output current VDD=2 V
-
Input frequency
1 MHz
VDD=2.0 V to 5.5 V
Min.
-
Typ.
1
0.9
2.2
-
-
5
0.8
V
-
V
0.4
10/-10
A
10
20
-
4/5 VDD
-
Unit Applicable terminal
A
All inputs other than
CS1
0.4
-
1/5 VDD
-
V1=VDD/0 V
Max.
10
1/-1
10/-10
pF
D0 to D3
STD.P
Input other than
D0 to D3
D0 to D3, STD.P
V
CS1
A
Input other than
D0 to D3
D0 to D3
PROMOTION OF ENVIRONMENTAL MANAGEMENT SYSTEM
CONFORMING TO INTERNATIONAL STANDARDS
At Seiko Epson, all environmental initiatives operate under the
Plan-Do-Check-Action (PDCA) cycle designed to achieve continuous
improvements. The environmental management system (EMS)
operates under the ISO 14001 environmental management standard.
All of our major manufacturing and non-manufacturing sites, in
Japan and overseas, completed the acquisition of ISO 14001
certification.
ISO 14000 is an international standard for environmental
management that was established by the International
Standards Organization in 1996 against the background of
growing concern regarding global warming, destruction of
the ozone layer, and global deforestation.
WORKING FOR HIGH QUALITY
In order provide high quality and reliable products and services
than meet customer needs,
Seiko Epson made early efforts towards obtaining ISO9000 series
certification and has acquired ISO9001 for all business
establishments in Japan and abroad. We have also acquired ISO/TS
16949 certification that is requested strongly by major automotive
manufacturers as standard.
ISO/TS16949 is the international standard that added the
sector-specific supplemental requirements for automotive
industry based on ISO9001.
►Explanation of the mark that are using it for the catalog
►Pb free.
►Complies with EU RoHS directive.
*About the products without the Pb-free mark.
Contains Pb in products exempted by EU RoHS directive.
(Contains Pb in sealing glass, high melting temperature type solder or other.)
►Designed for automotive applications such as Car Multimedia, Body Electronics, Remote Keyless Entry etc.
►Designed for automotive applications related to driving safety (Engine Control Unit, Air Bag, ESC etc ).
Notice

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

This material is subject to change without notice.
Any part of this material may not be reproduced or duplicated in any form or any means without the written permission of Seiko Epson.
The information about applied circuitry, software, usage, etc. written in this material is intended for reference only. Seiko Epson does
not assume any liability for the occurrence of infringing on any patent or copyright of a third party. This material does not authorize the
licensing for any patent or intellectual copyrights.
When exporting the products or technology described in this material, you should comply with the applicable export control laws and
regulations and follow the procedures required by such laws and regulations.
You are requested not to use the products (and any technical information furnished, if any) for the development and/or manufacture of
weapon of mass destruction or for other military purposes. You are also requested that you would not make the products available to
any third party who may use the products for such prohibited purposes.
These products are intended for general use in electronic equipment. When using them in specific applications that require extremely
high reliability, such as the applications stated below, you must obtain permission from Seiko Epson in advance.
/ Space equipment (artificial satellites, rockets, etc.) / Transportation vehicles and related (automobiles, aircraft, trains,
vessels, etc.) / Medical instruments to sustain life / Submarine transmitters / Power stations and related / Fire work equipment
and security equipment / traffic control equipment / and others requiring equivalent reliability.
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Seiko Epson Corporation