Discontinued Product
RX-4575LC (Built-in External Event Detection. Serial Interface Real Time Clock

  • 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
    1.3V to 5.5V
  • Low backup current
    0.35µA / 3V(Typ.)
  • External event detection
    Chattering free input port *2.
  • (The various functions include full calendar, alarm, timer.)

Complies with EU RoHS directive.


Block diagram

Block diagram


  • Event detection.
    • Selectable Hi detection or Lo detection.
    • Recognition of detection is available both the hardware
      interrupt and the monitor via software.
    • Automatic interrupt release mode is available.
    • The all 'OR' interrupt output is possible via alarm, timer and event detection.
  • Performance of event input terminal.
    • As for the chattering filter,
      following are prepared for. ( 8ms, 31ms, 62ms, 125ms )
    • Built-in resistor connect and release is possible via software.
      Selectable pull-up or pull-down.
  • Timer function
    • Built in 12bit counter.
    • Timing period are 1min, 1s, 64Hz, 4096Hz.
  • Alarm function
    • Alarm setting is possible by combination of a day, hours, and minutes.

Pin function

Signal Name Input/Output Function
Input External event input pin.
CE 0
CE 1
Input Interface is possible when both CE0 and CE1 is high level.
CLK Input Serial Clock input pin.
DATA Bi-directional Data input and output pin.
FOUT Output 32.768kHz clock output pin (C-MOS).
Output is Hi-Z when OFF.
FOE Input 32kHz is output when input is Hi, 32kHz is OFF when input is Lo.
/ EIRQ Output Interrupt output pin. (N-ch open drain).
/ IRQ Output Interrupt output pin. (N-ch open drain).
VDD - Connected to a positive power supply.
GND - Connected to a ground.

Terminal connection / External dimensions

Terminal connection External dimensions

(Unit: mm)

Specifications *Refer to application

Recommend Operating Conditions

Item Symbol Condition Min. Typ. Max. Unit
Power voltage VDD - 1.6 3.0 5.5 V
Clock voltage VCLK - 1.3 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
1Max. s
Ta=-40°C to +85°C
3Max. s

* Equivalent to 1minute of monthly deviation

Current consumption characteristics

*Ta=-40°C to +85°C

Item Symbol Conditions Min. Typ. Max. Unit

FOUT: output OFF
Event detection OFF
VDD=5V 0.45 0.9 µA
VDD=3V 0.35 0.7
l32k CE0,CE1=GND / IRQ, / EIRQ= OFF

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