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S-35392A
www.sii-ic.com
© SII Semiconductor Corporation, 2006-2016
2-WIRE REAL-TIME CLOCK
Rev.3.2_02
The S-35392A 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-35392A can be used for various power supplies from
main supply to backup battery. Due to the 0.45 μA current consumption and wide range of power supply voltage at time
keeping, the S-35392A 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-35392A 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.
Features
Low current consumption:
0.45 μA typ. (VDD = 3.0 V, Ta = +25°C)
Constant output of 32.768 kHz clock pulse (Nch open-drain output)
Wide range of operating voltage:
1.3 V to 5.5 V
Built-in clock correction function
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
Applications
Mobile game device
Mobile AV device
Digital still camera
Digital video camera
Electronic power meter
DVD recorder
TV, VCR
Mobile phone, PHS
Package
SNT-8A
1

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2-WIRE REAL-TIME CLOCK
S-35392A
Block Diagram
Rev.3.2_02
XIN
XOUT
Oscillation
circuit
Divider,
timing generator
VDD
VSS
Clock correction register
Status register 1
Status register 2
Free register
Low power supply
voltage detector
Power-on
detection circuit
Constant-
voltage circuit
INT1 register
INT1
controller
Comparator 1
Real-time data register
Second Minute
Hour
Day of
the week
Day
Month
Year
Comparator 2
INT2 register
Shift register
INT2
controller
Serial
interface
32KO
INT2
SDA
SCL
Figure 1
2

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Rev.3.2_02
2-WIRE REAL-TIME CLOCK
S-35392A
Product Name Structure
1. Product name
S-35392A - I8T1 U
Environmental code
U: Lead-free (Sn 100%), halogen-free
Package name (abbreviation) and IC packing specification*1
I8T1: SNT-8A, Tape
Product name
*1. Refer to the tape drawing.
2. Package
Package Name
SNT-8A
Table 1 Package Drawing Codes
Dimension
PH008-A-P-SD
Tape
PH008-A-C-SD
Reel
PH008-A-R-SD
Land
PH008-A-L-SD
3

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2-WIRE REAL-TIME CLOCK
S-35392A
Rev.3.2_02
Pin Configuration
1. SNT-8A
Top view
18
27
36
45
Figure 2 S-35392A-I8T1U
Table 2 List of Pins
Pin No. Symbol Description
I/O
Configuration
Pin for constant
1 32KO output of 32.768 Output
kHz
Nch open-drain output
(no protective diode at VDD)
2 XOUT Connection pins
3 XIN for crystal oscillator
4 VSS GND pin
5
INT2
Output pin for
interrupt signal 2
Output
Nch open-drain output
(no protective diode at VDD)
6 SCL
Input pin for serial
clock
Input
CMOS input
(no protective diode at VDD)
7 SDA
I/O pin for serial
data
Nch open-drain output
Bi-directional (no protective diode at VDD)
CMOS input
8 VDD
Pin for positive
power supply
4

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Rev.3.2_02
2-WIRE REAL-TIME CLOCK
S-35392A
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. 32KO (output of 32.768 kHz) pin
This is an output pin for 32.768 kHz. This pin constantly outputs a clock pulse after power-on.
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
interrupt, output of user-set frequency, 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
32KO, INT2
Figure 4 SCL Pin
Figure 5 32KO Pin, INT2 Pin
5