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S-35399A03
www.sii-ic.com
© SII Semiconductor Corporation, 2007-2016
2-WIRE REAL-TIME CLOCK
Rev.3.1_02
The S-35399A03 is a CMOS 2-wire real-time clock IC which operates with the very low current consumption in the wide range
of operation voltage. The operation voltage is 1.3 V to 5.5 V so that the S-35399A03 can be used for various power supplies
from main supply to backup battery. Due to the 0.34 μA current consumption and wide range of power supply voltage at time
keeping, The S-35399A03 makes the battery life longer. In the system which operates with a backup battery, the included free
registers can be used as the function for user's backup memory. Users always can take back the information in the registers
which is stored before power-off the main power supply, after the voltage is restored.
The S-35399A03 has the function to correct advance / delay of the clock data speed, in the wide range, which is caused by the
crystal oscillation circuit's frequency deviation. Correcting according to the temperature change by combining this function and
a temperature sensor, it is possible to make a high precise clock function which is not affected by the ambient temperature.
Moreover, the S-35399A03 has a 24-bit binary up counter. This counter counts up every 60 seconds from power-on so that
users are able to grasp the elapsed time from power-on up to 30 years.
Features
Low current consumption:
0.34 μA typ. (VDD = 3.0 V, Ta = +25°C)
Wide range of operating voltage:
1.3 V to 5.5 V
Built-in clock correction function
Built-in 24-bit binary up counter
Built-in free user register
2-wire (I2C-bus) CPU interface
Built-in alarm interrupter
Built-in flag generator during detection of low power voltage or at power-on
Auto calendar up to the year 2099, automatic leap year calculation function
Built-in constant voltage circuit
Built-in 32.768 kHz crystal oscillator (built-in Cd, external Cg)
Lead-free, Sn 100%, halogen-free*1
*1. Refer to "Product Name Structure" for details.
Applications
Mobile game device
Mobile AV device
Digital still camera
Digital video camera
Electronic power meter
DVD recorder
TV, VCR
Mobile phone, PHS
Package
8-Pin SOP (JEDEC)
1

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2-WIRE REAL-TIME CLOCK
S-35399A03
Block Diagram
XIN
XOUT
Oscillation
circuit
Divider,
timing generator
Clock correction
register
Status
register 1
Status
register 2
Free register 1
Free register 2
Free register 3
VDD
24-bit
binary
up counter
Low power
supply voltage
detector
Constant-
voltage circuit
INT1 controller
INT1 register
Alarm expansion
register 1
Comparator 1
Second Minute
Hour
Day of
the week
Day
Month Year
Real-time data register
Comparator 2
INT2 register
Alarm
expansion
INT2 controller
Shift register
Serial
interface
Power-on
detection circuit
Figure 1
Rev.3.1_02
INT1
INT2
SDA
SCL
VSS
2

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Rev.3.1_02
2-WIRE REAL-TIME CLOCK
S-35399A03
Product Name Structure
1. Product name
S-35399A03 - J8T2 x
Environmental code
U: Lead-free (Sn 100%), halogen-free
G: Lead-free (for details, please contact our sales office)
Package name (abbreviation) and IC packing specification*1
J8T2: 8-Pin SOP (JEDEC), Tape
Product name
*1. Refer to the tape drawing.
2. Package
Table 1 Package Drawing Codes
Package Name
8-Pin SOP (JEDEC)
Environmental code = G
Environmental code = U
Dimension
FJ008-A-P-SD
FJ008-A-P-SD
Tape
FJ008-D-C-SD
FJ008-D-C-SD
Reel
FJ008-D-R-SD
FJ008-D-R-S1
3

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2-WIRE REAL-TIME CLOCK
S-35399A03
Rev.3.1_02
Pin Configuration
1. 8-Pin SOP (JEDEC)
Top view
18
27
36
45
Figure 2 S-35399A03-J8T2x
Table 2 List of Pins
Pin No
1
2
3
4
5
6
7
8
Symbol
Description
I/O
Configuration
INT1
Output pin for interrupt
signal 1
Output
Nch open-drain output
(no protective diode at VDD)
XOUT Connection pins
XIN for crystal oscillator
VSS GND pin
−−
INT2
SCL
SDA
Output pin for interrupt
signal 2
Output
Nch open-drain output
(no protective diode at VDD)
Input pin for serial clock Input
CMOS input
(no protective diode at VDD)
Nch open-drain output
I/O pin for serial data Bi-directional (no protective diode at VDD)
CMOS input
VDD
Pin for positive power
supply
Remark 1. x: G or U
2. Please select products of environmental code = U for Sn 100%, halogen-free products.
4

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Rev.3.1_02
2-WIRE REAL-TIME CLOCK
S-35399A03
Pin Functions
1. SDA (I/O for serial data) pin
This pin is a data input / output pin of I2C-bus interface. This pin inputs / outputs data by synchronizing with a clock pulse
from the SCL pin. This pin has CMOS input and Nch open-drain output. Generally in use, pull up this pin to the VDD
potential via a resistor, and connect it to any other device having open drain or open collector output with wired-OR
connection.
2. SCL (input for serial clock) pin
This pin is to input a clock pulse for I2C-bus interface. The SDA pin inputs / outputs data by synchronizing with the clock
pulse.
3. XIN, XOUT (crystal oscillator connect) pins
Connect a crystal oscillator between XIN and XOUT.
4. INT1 (output for interrupt signal 1) pin
This pin outputs a signal of interrupt, or a clock pulse. By using the status register 2, users can select either of; alarm 1
interrupt, output of user-set frequency, per-minute edge interrupt, minute-periodical interrupt 1, minute-periodical
interrupt 2, or 32.768 kHz output. This pin has Nch open-drain output.
5. INT2 (output for interrupt signal 2) pin
This pin outputs a signal of interrupt, or a clock pulse. By using the status register 2, users can select either of; alarm 2
interrupt, output of user-set frequency, per-minute edge interrupt or minute-periodical interrupt 1. This pin has Nch
open-drain output.
6. VDD (positive power supply) pin
Connect this VDD pin with a positive power supply. Regarding the values of voltage to be applied, refer to
"Recommended Operation Conditions".
7. VSS pin
Connect this VSS pin to GND.
Equivalent Circuits of Pins
SDA
SCL
Figure 3 SDA Pin
INT1, INT2
Figure 4 SCL Pin
Figure 5 INT1 Pin, INT2 Pin
5