RA-8565SA (for Automotive I2C-Bus Interface Real Time Clock Module)

  • Interface Type
    I2C-Bus Interface(400kHz)
  • Wide operating voltage range
    1.8V to 5.5V
  • Wide Timekeeper voltage range
    1.7V to 5.5V
    Ta=-40°C to +125°C
  • Extended operating temperature range
    -40°C to +125°C
  • 32.768kHz frequency output function
    N-ch Open drain output
    With Control Pin
  • The various functions include full calendar, alarm, timer,etc.
  • Applications : Car audio, Car navigation system, Clock, ECU sub clock
  • AEC-Q200 compliant
  • Built in frequency adjusted 32.768kHz crystal unit.


Complies with EU RoHS directive.


Block diagram

Block diagram


  • Wide operating temperature range for automotive
    • -40°C to +125°C
  • Clocking-status detection function
    • It can judge the validity of data after backup operation return by a status of VL-bit.
  • 32.768kHz frequency output function
    • CLKOUT pin output (N-ch Open Drain output )
    • Output frequency can be selected as 32.768kHz, 1024Hz, 32Hz, or 1Hz.
  • The various interrupt function
    • Timer function can be set up between 1/4096 second and 255 minutes.
    • Alarm function can be set to day of week, day, hour, or minute.

Specifications *Refer to application manual for details.

Recommend Operating Conditions

Item Symbol Condition Min. Typ. Max. Unit
Operating voltage VDD - 1.8 3.0 5.5 V
Timekeeper voltage VCLK - 1.7 3.0 5.5 V
Operating temperature TOPR - -40 +25 +125 °C

Frequency characteristics

Item Symbol Condition Rating Unit
Frequency stability Δ f/f Ta=+25°C
5±23 *1 ×10-6
Oscillration start up time tSTA Ta=+25°C
1.5Max. s
Ta=-40°C to +125°C
3Max. s

*1 Equivalent to ±1 minutes of monthly deviation.

Current consumption characteristics

Item Symbol Conditions Min. Typ. Max. Unit
Standby current. lBK fSCL=0Hz

+125°C 1.10 1.8 µA
-40°C to +85°C 0.60 1.2
fSCL = 0Hz

+125°C 1.00 1.6 µA
-40°C to +85°C 0.55 1.0


Pin function

Signal Name Input/Output Function
SCL Input Serial clock input.
SDA Bi-directional Data input and output.
CLKOUT Output The CLKOUT pin is a clock output (open drain output) pin
with control output. (Output frequency can be selected
as 32.768kHz, 1024Hz, 32Hz, or 1Hz.)
The CLKOE pin is an input pin used to control the output
mode of the CLKOUT output pin.
During the initial power-on (when power is applied from 0V),
if the CLKOE input pin is at high level ( = H),
the power-on reset function selects 32.768kHz as the frequency.
/INT Output Interrupts output by Alarm and Timer events. (Open drain output)
VDD - Connected to a positive power supply.
GND - Connected to a ground.

Terminal connection / External dimensions

Terminal connection External dimensions

(Unit: mm)

The metal case inside of the molding compound may be exposed on the top or bottom of this product.
This purely cosmetic and does not have any effect on quality, reliability or electrical specs.

Footprint (Recommended)


(Unit: mm)

To maintain stable operation, provide a 0.1uF by-pass capacitor
at a location as near as possible to the power source terminal of the crystal product (between Vcc - GND).

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