
Rev.1.2_00
3-WIRE REAL-TIME CLOCK
S-35190A
Seiko Instruments Inc.
1
The S-35190A is a low-current-consumption 3-wire CMOS real-time clock IC
that features a wide operating voltage range (1.3 V to 5.5 V) and can be
driven on a variety of supply voltages, from a main supply to a backup
supply. The time keeping current consumption of 0.25
A and minimum
time keeping operation voltage of 1.1 V enable greatly increased battery
duration.
In a system that operates on a backup battery, the free register incorporated
in the real-time clock can be used for the user backup memory function.
The user register can hold data on a supply voltage as low as 1.2 V (min.),
so the data stored in the register before the main power supply was cut can
be called any time after the voltage is restored.
This product also includes a clock adjustment function that enables wide-
ranging correction of deviation in the frequency of the crystal oscillator at a
minimum resolution of 1 ppm. Also, by combining this function with a
temperature sensor, the clock adjustment value can be set in accordance
with changes in the temperature, which makes it possible to realize a clock
function that retains a high degree of accuracy regardless of temperature
variation.
Features
Low current consumption:
0.25
A typ. (VDD = 3.0 V, Ta = 25°C)
Wide operating voltage range:
1.3 to 5.5 V
Minimum time keeping operation voltage: 1.1 V
Built-in clock adjustment function
Built-in free user register
3-wire (micro wire) CPU interface
Built-in alarm interrupter
Built-in flag generator at power down or power on
Auto calendar up to the year 2099, automatic leap year calculation function
Built-in constant voltage circuit
Built-in 32 kHz crystal oscillator circuit (Cd built in, Cg external)
Package: 8-pin SOP (JEDEC), 8-pin TSSOP, SNT-8A
Applications
Digital still cameras
Digital video cameras
Electronic power meters
DVD recorders
TVs, VCRs
PHS
Mobile phones
Car navigation
Packages
Package Name
Drawing Code
Package
Tape
Reel
8-Pin SOP(JEDEC)
FJ008-A
FJ008-D
8-Pin TSSOP
FT008-A
FT008-E
SNT-8A
PH008-A