RA8803SA for Automotive
(Built-in 32.768kHz-DTCXO, High Stability I2C-Bus Interface Real Time Clock Module)

  • Built in frequency adjusted 32.768kHz crystal unit and DTCXO.
  • 1/100s resolution Time register
  • Interface Type
    I2C-Bus interface (400kHz)
  • Interface voltage range
    1.6V to 5.5V
  • Temp. compensated voltage range
    2.2V to 5.5V
  • Timekeeping voltage range
    1.6V to 5.5V
  • Selectable clock output (32.768kHz, 1024Hz, 1Hz)
  • The various functions include full calendar, alarm, timer, EVIN input.
  • Applications: Car audio, Car navigation system, Clock.
  • AEC-Q200 compliant


Complies with EU RoHS directive.


Block diagram

Block diagram


  • High Stability
    • UA ± 3.4 × 10-6 / -40°C to +85°C
    • (Equivalent to ±9seconds of month deviation)
    • UB ± 5.0 × 10-6 / -40°C to +85°C
    • (Equivalent to ±13seconds of month deviation)
    • UC ± 5.0 × 10-6 / -30°C to +70°C
    • (Equivalent to ±13seconds of month deviation)
    • AA (+5 ± 5.0) × 10-6 / +25°C
  • High Resolution:1/100s Time register with capture buffer
  • 32.768kHz frequency output function
    • FOUT pin output (C-MOS output), CL=30pF
    • Output selectable: 32.768kHz, 1024Hz, 1Hz
  • The various interrupt
    • Timer Function can be set between 1/ 4096second and 4095minutes.
    • Alarm Function can be set to day of week, day, hour, or minute.
    • EVIN input.
  • Time synchronize function with 1PPS signal input
  • Register compatibility: upper compatible with RX-8801.
  • *It is possible to use it by the terminal connection as 32.768kHz-DTCXO.

Specifications *Refer to application manual for details.

Electrical Characteristics

Item Symbol Condition Min. Typ. Max. Unit
Operating voltage VDD Interface voltage 1.6 3.0 5.5 V
Temp. compensated Voltage VTEM Temp. compensated voltage 2.2 3.0 5.5 V
Clock supply voltage VCLK - 1.6 3.0 5.5 V
Operating temperature TOPR   -40 +25 +85 °C
Stability Δf/f UA Ta = -40°C to +85°C ±3.4*1 ×10-6
UB Ta = -40°C to +85°C ±5.0*2
UC Ta = -30°C to +70°C
AA Ta = +25°C 5 ± 5.0*3
Current consumption (1) IDD1 Backup Mode
FOUT output : OFF
VDD = 5V - 0.75 3.4 µA
Current consumption (2) IDD2 VDD = 3V - 0.75 2.1


Pin function

Signal Name Input/Output Function
T1(CE) Input Use by the manufacture for testing.
( Do not connect externally.)
SCL Input Serial clock input pin.
FOUT Output The pin outputs the reference clock signal.
( CMOS output )
TEST Input Use by the manufacture for testing.
( Do not connect externally. RX-8803SA only.)
VDD - Connected to a positive power supply
FOE Input The input pin for the FOUT output control.
EVIN Input External event input.
( Do not make this pin OPEN.)
/ INT Output Interrupt output (N-ch. open drain).
GND - Connected to a ground
T2(VPP) - Use by the manufacture for testing.
( Do not connect externally.)
SDA I/O Data input and output pin.

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).

*1 Equivalent to 9 seconds of month deviation.
*2 Equivalent to 13 seconds of month deviation.
*3 Equivalent to 13 seconds of month deviation. (excluding offset)

32.768kHz-DTCXO Frequency temperature characteristics (Example)

Frequency temperature characteristics

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