Timer ICs / ASSPs

Introduction – Real-time Clock (RTC)

RTC top

Real-time clock is a clock function used by systems that measure time even when the main device (such as MCU) is powered off. For example, even when the main battery or power supply is removed from a camera or gaming device, system can measure time by powering the real-time clock from a sub-battery or super capacitor built into that system.

RTC circuit example

ABLIC’s real-time clock achieves longer battery life by ultra-low current consumption.
ABLIC also proposes various time management solutions including high accuracy clock correction function, constant 32kHz output, expansion alarm, 24 bit up counter and ultra-small package.

1. Low current consumption of 0.25μA

Achieves longer battery life by ultra-low current consumption of 0.25µAABLIC’s real-time clock achieves longer battery life by ultra-low current consumption of 0.25µA. When using a  rechargeable lithium-ion battery (3.4mAh) for backup, long-time driving of up to 13,000 hours is possible. Users are able to use smaller batteries, promoting high-density mounting.

 

 

 

2. High-accuracy clock correction, minimum resolution of 1ppm

The frequency deviation of a quartz crystal can be corrected over a wide range with high accuracy at a  minimum resolution of 1ppm. By combining the real-time clock with a temperature sensor IC, the value of clock correction can be set according to the temperature change, enabling accurate correction if the clock becomes fast or slow.

High-accuracy clock correction

 

3. Various solutions such as constant output of 32kHz

32kHz constant output● Constant output of 32kHz (clock pulse of 32.768kHz output to MCU)
A 32.768kHz clock is output to the MCU or other devices from an oscillator built into the real-time clock. This output makes a quartz crystal unnecessary, reducing the number of parts.

 

● Expanded alarm interrupt function, long-period setting!
ABLIC’s real-time clock not only has the standard day-of-the-week, hour and minute alarm interrupt functions; it also has alarm functions for the year, month and day.

● Counts up to about 30 years using 24-bit binary up-counter!
The 24-bit binary up-countercounts up every 60 seconds after power-on. Users are able to ascertain the elapsed time up to about 30 years.

 

4. Ultra-small package SNT

The world’s smallest class real-time clock enables high-density mounting compared to conventional products.Package List

 

 

Series Name
(Product Summary)
Data SheetWebshopInterfaceFeaturesPower supply voltage
that allows communication
(V)
Current
consumption (3.0V)
(µA)
Package
Series Name
S-35390APDFchip1stop
CoreStaFF
Digi-Key
MOUSER
2-wireSuper-low 0.25µA current consumption1.3 to 5.50.258-Pin SOP, 8-Pin TSSOP, SNT-8A
S-35391APDFchip1stop
CoreStaFF
Digi-Key
MOUSER
2-wireA product having different device code from S-35390A1.3 to 5.50.258-Pin SOP, SNT-8A
S-35392APDFchip1stop
CoreStaFF
Digi-Key
MOUSER
2-wireConstant 32kHz output1.3 to 5.50.45SNT-8A
S-35399A03PDFchip1stop
CoreStaFF
Digi-Key
MOUSER
2-wireAlarm settable to day/month/year, 24-bit counter1.3 to 5.50.348-Pin SOP
S-78390A-2-wireSwitch input detection function1.3 to 5.50.35Contact our sales representatives.
S-35190APDFchip1stop
CoreStaFF
Digi-Key
MOUSER
3-wireSuper-low 0.25µA current consumption1.3 to 5.50.258-Pin SOP, 8-Pin TSSOP, SNT-8A
S-35192APDFchip1stop
CoreStaFF
Digi-Key
MOUSER
3-wireConstant 32kHz output1.3 to 5.50.45SNT-8A
S-78190A-3-wireSwitch input detection function1.3 to 5.50.3516-Pin TSSOP

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