SPECIFICATION
1. Application
1)This document is applicable to the real time clock module RX-8025T that are delivered
to from Seiko Epson Corp.
2)RoHS compliant
RX-8025T contains lead in high melting type solder which is exempted in RoHS directive.
3)This Product supplied (and any technical information furnished, if any) by Seiko Epson Corporation shall not be
used for the development and manufacture of weapon of mass destruction or for other military purposes. Making available such products and technology to any third party who may use such products or technologies for the said purposes are also prohibited.
4)This product listed here is designed as components or parts for electronics equipment in general consumer use.
We do not expect that any of these products would be incorporated or otherwise used as a component or part for the equipment, which requires an systems, and medical equipment, the functional purpose of which is to keep extra high reliability, such as satellite, rocket and other space life.
2. Product No. / Model
The product No. of this Real Time Clock Module is X1B0002810005.
The model is RX – 8025T VerD
3. Packing
It is subject to the packing standard of Seiko Epson Corp.
4. Warranty
Defective parts which are originated by us are replaced free of charge in case defects are found within 12 months after delivery.
5. Amendment and abolishment
Amendment and/or abolishment of this specification are subject to the agreement of both parties.
6. Contents
Item No. Item Page
1 Block diagram    2
2 Terminal description    3
3 Absolute maximum ratings    4
4 Recommend operating conditions    4
5 Frequency characteristics    4
6 Electrical characteristics    5 to 6
7 Register table 7 to 10
8 External Dimensions / Marking Layout 11
9 Environmental and mechanical characteristics 12
10 Application note 13
2. Terminal description
2.2. Pin Functions
Signal
name
I/O Function T1 Input * Use by the manufacture for testing. ( Do not connect externally.) SCL Input This is the serial clock input pin for I2C Bus communications.
FOUT Output This is the C-MOS output pin with output control provided via the FOE pin. When FOE ="H"(high level), this pin outputs a 32.768 kHz signal.
When output is stopped, the FOUT pin = "Hi-Z"( high impedance ).
TEST Input * Use by the manufacture for testing. ( Do not connect externally.) V DD−This pin is connected to a positive power supply.
FOE Input This is an input pin used to control the output mode of the FOUT pin.
When this pin's level is high, the FOUT pin is in output mode. When it is low, output via the FOUT pin is stopped.
/ INT Output This pins is used to output alarm signals, timer signals, time update signals, and other signals. This pin is an open drain pin.
GND −This pin is connected to a ground.
T2 −* Use by the manufacture for testing. ( Do not connect externally.)
SDA I / O This pin's signal is used for input and output of address, data, and ACK bits, synchronized with the serial clock used for I2C communications.
Since the SDA pin is an N-ch open drain pin during output, be sure to connect a suitable pull-up resistance relative to the signal line capacity.
N.C. −This pin is not connected to the internal IC.
Leave N.C. pins open or connect them to GND or V DD.
Note: Be sure to connect a bypass capacitor rated at least 0.1 µF between V DD and GND.
3. Absolute Maximum Ratings GND=0V
Item Symbol Condition Rating Unit Supply voltage V DD Between V DD and GND −0.3 to +6.5 V Input voltage (1) V IN1FOE pin GND−0.3 to V DD+0.3 V Input voltage (2) V IN2SCL and SDA pins GND−0.3 to +6.5 V Output voltage (1) V OUT1FOUT pin GND−0.3 to V DD+0.3 V Output voltage (2) V OUT2SDA and /INT pins GND−0.3 to +6.5 V
Storage temperature T STG When stored separately,
without packaging
−55 to +125 °C
4. Recommended Operating Conditions GND=0 V
Item Symbol Condition Min. Typ. Max. Unit Operating supply voltage V DD Interface voltage    1.6    3.0    5.5 V
Temp. compensation
voltage V TEM Temperature compensation
voltage
2.2
3.0    5.5 V
Clock supply voltage V CLK−  1.6    3.0    5.5 V Operating temperature T OPR No condensation −40 +25 +85 °C 5. Frequency Characteristics GND=0V
Item Symbol Condition Rating Unit
Frequency tolerance ∆f /f UC Ta =0 to +50 ºC, V DD = 3.0 V
Ta = −30 to +70 ºC, V DD = 3.0 V
± 3.8 (∗1)
± 5.0 (∗2)
× 10-6
Frequency/voltage
characteristics
f /V Ta = +25 °C, V DD = 2.2 V to 5.5 V ± 1.0 Max. × 10-6 /V
Oscillation start time t STA Ta = +25 °C, V DD = 1.6 V
timeout on t2 timer
Ta = −40 to +85 ºC, V DD = 1.6 V to 5.5 V
1.0 Max.
3.0 Max.
s
Aging fa Ta = +25 °C, V DD = 3.0 V, first year ± 3 Max. × 10−6 / year * 1 ) Equivalent to 10 seconds of month deviation. *2 ) Equivalent to 13 seconds of month deviation.
6. Electrical Characteristics
6.1. DC Characteristics
*Unless otherwise specified, GND  = 0 V, V DD  = 1.6 V  to  5.5 V, Ta  = −40 °C  to  +85 °C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Current
consumption (1) I DD1 V DD  = 5 V      1.2    3.4
Current
consumption (2) I DD2  f SCL  = 0 Hz, / INT = V DD  FOE = GND
FOUT : output OFF ( High Z  )  Compensation interval 2.0 s V DD  = 3 V
0.8    2.1 µA
Current
consumption (3) I DD3 V DD  = 5 V      3.0 7.5
Current
consumption (4) I DD4  f SCL  = 0 Hz, / INT = V DD  FOE = GND
FOUT :32.768 kHz, CL =0pF  Compensation interval 2.0 s V DD  = 3 V      2.0    5.0 µA
Current
consumption (5) I DD5 V DD  = 5 V    8.0 20.0
Current
consumption (6) I DD6  f SCL  = 0 Hz, / INT = V DD  FOE = GND
FOUT :32.768 kHz, CL =30pF  Compensation interval 2.0 s V DD  = 3 V      5.0  12.0 µA
Current
consumption (7) I DD7 V DD  = 5 V      1.15    2.95
Current
consumption (8) I DD8  f SCL  = 0 Hz, / INT = V DD  FOE = GND
FOUT : output OFF ( High Z  )  Compensation OFF
V DD  = 3 V    0.72  1.85 µA
Current
consumption (9) I DD9 V DD  = 5 V    430 900
Current
consumption (10) I DD10  f SCL  = 0 Hz, / INT = V DD  FOE = GND
FOUT : output OFF ( High Z  )  Compensation ON ( peak )
V DD  = 3 V
180  350 µA
FOE pin
0.8 × V DD
V DD + 0.3 High-level  input voltage
V IH  SCL and SDA pins 0.7 × V DD      5.5 V  FOE pin
GND − 0.3  0.2 × V DD  Low-level  input voltage
V IL  SCL and SDA pins
GND − 0.3
0.3 × V DD  V V OH1 V DD =5 V, I OH =−1 mA
4.5
5.0 V OH2 V DD =3 V, I OH =−1 mA
2.2
3.0 High-level  output voltage
V OH3  FOUT pin V DD =3 V, I OH =−100 µA    2.9    3.0 V
V OL1 V DD =5 V, I OL =1 mA
GND  GND+0.5 V OL2 V DD =3 V, I OL =1 mA
GND  GND+0.8 V OL3  FOUT pin V DD =3 V, I OL =100 µA GND  GND+0.1 V V OL4 V DD =5 V, I OL =1 mA
GND  GND+0.25 V OL5  / INT pin
V DD =3 V, I OL =1 mA
GND  GND+0.4 V Low-level  output voltage
V OL6  SDA pin V DD ≥2 V, I OL =3 mA GND  GND+0.4
V Input leakage current
I LK  FOE, SCL, SDA pins ,  V IN = V DD  or GND  −0.5  0.5 µA Output leakage current
I OZ
/ INT, SDA, FOUT pins, V OUT = V DD  or GND
−0.5
0.5
µA

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