Actual size
http://www.epsontoyocom.co.jp
Real time clock module
Real time clock moduleReal time clock module
Real time clock module
105
Block diagram
Terminal connection/External dimensions
(
Unit:mm
)
S
p
ecifications
(
characteristics
)
*Refer to a
pp
li c atio n ma nua l for details .
Absolute Max. rating DC characteristics
Item Symbol Condition Min. Max. Unit Item Symbol Condition Min. Typ. Max. Unit Applicable terminal
Supply voltage V
DD
T
a
=+25 °C -0.3 +7.0 I
DD1
V
DD
=5 V 1 10
-
Input voltage V
I/O
T
a
=+25 °C GND-0.3 V
DD
+0.3 V Current consumption I
DD2
CS
1
= 0 V
Exclude i nput/
output current V
DD
=2 V
-
0.9 5 µA
-
RTC-72421 -55 +85 HIGH input voltage (1) V
IH1
2.2
-
Storage
tem perature * T
STG
RTC-72423 -55 +125 °C LO W input v oltage (1) V
IL1
-
-
0.8
V All inputs other than
CS
1
*Stored as bare product after unpacking
LOW output voltage (1) V
OL1
I
OL
=2.5 mA
-
0.4
Operating range
HIGH output voltage V
OH
I
OH
=-400 µA 2.4
-
D
0
to D
3
Item Symbol Condition Min. Max. Unit LOW output voltage (2) V
OL2
I
OL
=2.5 mA 0.4
V
Pow er voltage V
DD
-
4.5 5.5 OFF leak current I
OFFLK
V
1
=V
DD
/0 V
-
10/-10 µASTD.P
Clock voltage V
CLK
-
2.0 5.5 V 10 Input other than
D
0
to D
3
RTC-72421 -10 +70 Input capacity C
1
Input frequency
1 MHz
-
20 pF D
0
to D
3
, STD.P
Operating
tem perature T
OPR
RTC-72423 -40 +85 °C HIGH input voltage (2) V
IH2
4/5 V
DD
-
Stored as ba re produc after unpacking
LO W input v oltage (2) V
IL2
V
DD
=2.0 V to 5.5 V
-
1/5 V
DD
V CS
1
Frequency characteristics
Input leak current (1) I
LK1
1/-1 µAInput other than
D
0
to D
3
Item Symbol Condition Range Unit Input leak current (2) I
LK2
V
1
=V
DD
/0 V
-
-
10/-10 D
0
to D
3
72421A ±10
72421B ±50
72423A ±20
Frequency
precision ∆f /f T
a
=+25 °C
V
DD
=5.0 V 72423 ±50
-10 °C to +70 °C (+25 °C) +10 / -120
Frequency
temperature
characteristics
TOP -40 °C to +85 °C(+25 °C) +10 / -220
×10
-6
Frequency voltage
characteristics
f/V T
a
=+25 °C,V
DD
=2.0 V to 5.5 V ±5.0 Max. ×10
-6
/V
Aging fa T
a
=+25 °C,V
DD
=5.0 V ,Fir st year ±5.0 Max. ×10
-6
/year
OSC
RESET
bit STOP
bit
30 sec A D J
bit
Counter
HOLD
bit BUSY
bit
D3
D2
D1
D0
WR
RD
A3
A2
A1
A0
CS0
ALE
CS1
S1 S10 MI1 MI10 H1 H10 W
D1 D10 MO1 MO10 Y1 Y10
64 Hz
1 Second carry
1 Minu te c arr
y
1 H our carr
y
S1 to
CF
CD CE CF
Gate
Gate
Latch
Decoder
24/1
bit
RTC-72421/72423
STD.P
Output
Selector
RTC-72421 RTC-72423
4-bit REAL T IME CLOCK MODULE
RTC
-
72421
/
RTC
-
72423
•B ui lt- i n cr yst al un it al l ows adjus t m ent -f ree eff ic i ent oper at i on .
•24 h /1 2 h ch ang eab l e and le ap y ear au t om at icall y adjus t able
(Gregorian calendar).
Metal may be expo sed on the top or bottom of this product. This will not affect any quality, reliability or electrical spec.
RTC-72421 (DIP 18-pin)
7.62
0° -1 5 ° 0.25
0.46
4.2
Max.
3.3
Min.
0.2
Min.
2.54
1.52
23.1 Max.
6.3
#1
#18 #10
#9
RTC72421 A
EPSON 1234A
No. Pin
terminal No. Pin
terminal
1 STD.P 18 V
DD
2 /CS
0
17 (V
DD
)
3 ALE 16 (V
DD
)
4 A
0
15 CS
1
5 A
1
14 C
0
6 A
2
13 D
1
7 A
3
12 D
2
8 /RD 11 D
3
9 GND 10 /WR
RTC-72423 (SOP 24-pin)
1.0
0.2
0° - 10°
0.2
0° - 10°
1.27 0.35
2.8 Max.
0.1 Min.
2.8 Max.
0.1 Min.
#12#1
16.3 Max.
#24 #13
7.9
12.2 Max.
RTC62423
EPSON 1234A
#12#1
16.3 Max.
#24 #13
7.9
12.2 Max.
RTC72423
EPSON 1234A
No . Pin
terminal No. Pin
terminal
1 STD.P 24 V
DD
2 /CS
0
23 (V
DD
)
3 N.C. 22 (V
DD
)
4 ALE 21 N.C.
5 A
0
20 CS
1
6 N.C. 19 D
0
7 A1 18 N.C.
8 N.C. 17 N.C.
9 A
2
16 D
1
10 A
3
15 D
2
11 /RD 14 D
3
12 GND 13 /WR
“3D STRATEGY” EPSON TOYOCOM
I n or der t o m eet cus tom er n eeds i n a r api dly a dv anci ng di gita l,
broadband and ubiquitous society, we are committed to offering
products t hat are one step ahead of the m arket and a rank above
the rest in quality. To achieve our goals, we follow a “3D (three
device) strategy” designed to drive both horizontal and vertical
growth. We will to grow our three device categories of “Timing
Devices”, ”Sensing Devices” and “Optical Devices”, and expand
vertical growth through a combination of products from these
categories.
Qu artz devices ha ve bec ome crucial in th e netw ork environment
where products are increasingly intended for broadband,
ubiquitous applications and where var ious t ypes of terminals can
transfer information almost immediately via LAN and WAN on a
global scale. Epson Toy ocom Corporat ion addresses e very single
aspect wi thin a networ k environment. The new corporation offers
“Digital Convergence” solutions to problems arising with products
for con su mer use, such as, core network systems and automotive
systems.
PROMOTION OF ENVIRONMENTAL MANAGEMENT SYSTEM
CONFORMING TO INTERNATIONAL STANDARDS
At Epson Toyocom, all environmental initiatives operate under the Plan-Do-Che ck-Action(PDCA) cycle designed to achieve continuous improvements.
T he en viron m ental m an ag e m ent s yst em ( E MS ) op erates un d er the IS O 140 01 en vi ronm ental m an agem en t stand ard.
All of ou r m ajor m an ufactur in g and non-m an ufactur in g sites , in J apan an d ov erseas , c omp l eted th e acq uis iti on of ISO 14 00 1 c ert ification.
In the future, new group companie s will be expected to acquire the certifica tion around the third year of operations.
WORKING FOR HIGH QUALITY
Epson Toyocom quickly began working to acquire company-wide ISO 9000 series certification, and has acquired ISO 9001 or ISO 9002 cer tif icati on for
all targeted products manufactured in Japane se and overseas plants.
Eps on Toy oc om has ac qu ired QS-90 00 c ert if ication , which is of a high er le vel .
Also, TS 16949 certification, which is also of a higher level, has been a cquired.
Notice
●This material is subject to change without notice.
●A n y par t of this mat er i al m ay n ot be reproduced or du pl icat ed in an y for m or an y m eans with out th e wr itten p er m is s i on of Epson Toyocom.
●T h e inform ation, app lied circ uitr y, pr ogr ammi ng, us ag e, etc ., writt en in th is mat erial is i ntend ed for r ef er enc e only. E ps on Toyoc om does not assume
any liabi lity f or th e occ ur r ence of inf ringi ng on any pat ent or c opyri g ht of a th ird par t y. Th is m ate ri al does not auth or i z e the licensing on for an y pat ent
or intellectual copyrights.
●Any product described in this material may contain technology or the subject relating to strategic products under the control of the Foreign
Exchange and Foreign Trade Law of Japan and may require an export license from the Ministry of International Trade and Industry or other
approval from an ot h er gov ernm ent agency.
●T h es e pr oducts ar e int end ed for gen er al us e in elec tr onic eq uipm ent. When usi ng them in s pecif ic appl ic ati ons that r equir e extr emel y high reli ab ilit y,
suc h as the app licati ons st ated below, you m us t obt ain p er m is s i on from Epson Toyoc om in advance.
/ Space equipment (artificia l satellites, rocke ts, etc.) / Transpo rtation vehicles and related (automobiles, aircraft, tra ins, vessels, etc.)
/ Medical instruments to sustain life / Subma rine transmitters / Power stations and rela ted / Fire work equipment and security eq ui pm ent
/ traffic control equipment / and others requiring equivalent reliability.
● I n this n ew cr yst al mas ter f or Epson Toyocom, pr od uc t c odes an d m arkings w ill rem ai n as pr evi ously id ent if i ed pr i or t o th e m er g er.
Due to the on-going strategy of gradual unification of part numbers, please review product codes and markings, as they will change during the
cour se of th e comi ng mon t hs .
We apologize for the inconvenience, but we will eventually have a unified part numbe ring system for Epson Toyocom that will be user friendly.
QS-9000 is an enhanced standard for qualit
y
assurance systems formulated by leading
U.S . aut om obil e m anufact ur ers b as ed on
th e int er n ati on al I SO 90 00 s eri es .
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, de struction
of th e oz on e lay er, and gl ob al deforest ation.
ISO/TS 16949 is a global standard based on
QS-9000 , a s evere st andard c orresp ondin g to
the requirements from the automobile industry.
