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Technical Note / White Paper

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

  • 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.

Complies with EU RoHS directive.

RTC-4574NB
RTC-4574NB

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RoHSpdf

REACH pdf

Brief Sheet pdf

Application Manual
(ETM05E-04) pdf (519KB)

Block diagram

Block diagram

Overview

  • 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.

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
VDD=3.0V		 5±23 * ×10-6
Oscillation start-up time tSTA Ta=+25°C
VDD=1.6V		 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
Current
Consumption		 lBK CE0,CE1=GND

FOUT;output OFF
(Hi-z)		 VDD=5V 1.0 2.0 µA
VDD=3V 0.5 1.0
l32k CE0=GND
CE1=VDD

FOUT;32.768kHz output ON
CL=30pF		 VDD=5V 8.0 20.0 µA
VDD=3V 5.0 12.0

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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)

footprint

(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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