RA-4574SA (For Automotive Serial-Interface Real Time Clock Module)

RA-4574SARA-4574SA

Complies with EU RoHS directive. automotive
  • 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.
  • Conforms to AEC-Q200

Block diagram

Block diagram


Overview

  • 32.768kHz frequency output function
    • FOUT pin output (C-MOS output ), CL=30pF
    • Output frequency selectable from 1/30Hz to 32.768kHz(32 Values)
  • Timer function
    • Timer function can be set between 1/4096 second and 255 minutes.
    • 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).

Pin function

Signal Name Input/Output Function
CE0 Input The chip enabled input pin 0. (Built-in pull-down resistance)
When both CE0 and CE1 pins are at the "H" level , access to this
Real time clock module becomes possible.
CE1 Input The chip enabled input pin 1.
When the CE1 pin is at the HIGH level, the FOUT pin is in the output state.
CLK Input The shift clock input pin for serial data transfer.
DATA Bi-directional The data input / output pin for serial data transfer.
FOUT Output This pin outputs the reference clock signal at 32.768kHz ( C-MOS output ).
High impedance at the time of output off.
FCON Input The input pin for the FOUT output control.
/ AIRQ Output The open drain output pin for alarm and time update interrupts.
/ TIRQ Output The open drain output pin for timer interrupt.
VDD - Connected to a positive power supply.
GND - Connected to a ground.

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
VDD=3.0V
5±23 * ×10-6
Oscillation start-up time tSTA Ta=+25°C
VDD=1.6V
3Max. s

* 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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