RTC-4574NB (Serial-Interface Real Time Clock Module)


Complies with EU RoHS directive.

  • Built in frequency adjusted 32.768kHz crystal unit.
  • Interface Type
    3-wire serial interface
  • Operating voltage range
    1.6V to 5.5V
  • Wide Timekeeper voltage range
    1.6V to 5.5V
  • Low backup current
    0.5µA / 3V(Typ.)
  • 32.768kHz frequency output function
    C-MOS output With Control Pin
  • The various functions include full calendar, alarm, timer.

Block diagram

Block diagram


  • 32.768kHz frequency output function
    • FOUT pin output (C-MOS output ), CL=30pF
    • Output frequency selectable from1/30Hz to 32.768kHz
      (32 Values)
  • Timer function
    • Timer function can be set up between 1/4096second and 255minutes.
    • It is recorded automatically to TF-bit at the time of event
      occurrence, and it's possible to output with /TIRQ pin output
      (open-drain output).
    • Selectable one time mode or repeat mode.
  • Alarm function
    • Alarm function can be set to any combination of day of week, hour, or minute.
    • It is recorded automatically to AF-bit at the time of event
      occurrence, and it's possible to output with /AIRQ pin
      output (open-drain output).
  • Functions are compatible with RX-4574LC.

Terminal connection / External dimensions

Terminal connection External dimensions

(Unit: mm)

Metal may be exposed on the top or bottom of this product. This will not affect any quality, reliability or electrical spec.

Specifications *Refer to application manual for details.

Recommend Operating Conditions

Item Symbol Condition Min. Typ. Max. Unit
Power voltage VDD - 1.6 3.0 5.5 V
Clock voltage VCLK - 1.6 3.0 5.5 V
Operating temperature TOPR - -40 +25 +85 °C

Frequency characteristics

Item Symbol Condition Rating Unit
Frequency tolerance Δ f/f Ta=+25°C
5±23 * ×10-6
Oscillation start-up time tSTA Ta=+25°C
3Max. s

* Please ask for tighter tolerance.(Equivalent to 1 minute of monthly deviation)

Current consumption characteristics

*Ta=-40°C to +85°C

Item Symbol Conditions Min. Typ. Max. Unit

FOUT;output OFF
VDD=5V 1.0 2.0 µA
VDD=3V 0.5 1.0
l32k CE0=GND

FOUT;32.768kHz output ON
VDD=5V 8.0 20.0 µA
VDD=3V 5.0 12.0
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