AB-RTC-TN-32.768kHz-2

Ultra-Low Power RTC Module

Revision: Initial Release

9/9/2025

Page 2

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Block Diagram

Frequency Characteristics (TA = -40 to +85°C unless otherwise indicated. VDD = 1.5 to 5.5V, TYP values at 25°C and 3.0V)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

F

Crystal Frequency

32.768

kHz

tSTART

Oscillator start-up time

tSTART = tPOR1 + tPOR2

CLKOE = VDD

80

500

ms

tSTART:EXT

Oscillator start-up time

tSTART:EXT = tPOR1:EXT + tPOR2:EXT

for extended temperature range

VDD = 1.6 to 5.5 V

CLKOE = VDD,

TA = +85°C to +105°C

500

ms

δCLKOUT

CLKOUT duty cycle

FCLKOUT = 32.768 kHz

TA = 25°C

50 ±10

%

ΔF/F

Frequency accuracy

TA = 25°C, calibration disabled

±10

±20

ppm

ΔF/FTOPR

Frequency vs. temperature

characteristics

TOPR = -40 to +105°C

VDD = 3.0 V

ppm

T0

Turnover temperature

+25 ±5

°C

ΔF/F

Aging first year max.

TA = 25°C, VDD = 3.0 V

±3

ppm