Rev.2.4
_00
2-WIRE REAL-TIME CLOCK
S-35390A
The S-35390A is a CMOS 2-wire real-time clock IC which operates with the very low current
consumption and in the wide range of operation voltage. The operation voltage is 1.3 V to 5.5
V so that this IC can be used for various power supplies from main supply to backup battery.
Due to the 0.25
µA
current consumption and wide range of power supply voltage at time
keeping, this IC 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.
This IC has the function to correct advance/delay of the clock data speed, in the wide range,
which is caused by the 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
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Low current consumption :
0.25
µA
typ. (V
DD
=
3.0 V, Ta
=
25°C)
Wide range of operating voltage :
1.3 to 5.5 V
Built-in clock-correction function
Built-in free user register
2-wire (I
2
C-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 (C
d
built in, C
g
external)
Packages : 8-Pin SOP (JEDEC), 8-Pin TSSOP, SNT-8A.
Lead-free product
Applications
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Mobile game devices
Mobile AV devices
Digital still cameras
Digital video cameras
Electronic power meters
DVD recorders
TVs, VCRs
Mobile phones, PHS
Car navigation
Packages
Drawing Code
Package
FJ008-A
FT008-A
PH008-A
Tape
FJ008-D
FT008-E
PH008-A
Reel
FJ008-D
FT-008E
PH008-A
Land
−
−
PH008-A
Package Name
8-Pin SOP (JEDEC)
8-Pin TSSOP
SNT-8A
Seiko Instruments Inc.
1
SII [ SEIKO INSTRUMENTS INC ]
