Diodes Incorporated
Back to Real Time Clock (RTC)

PT7C43190 (Obsolete)

3-wire interface RTC and low power consumption

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The PT7C43190 is a CMOS 3-wire real-time clock IC,
which operates with the very low current consumption
and in the wide range of operation voltage. The
operation voltage is 1.35 V to 5.5 V so that the RTC can
be used for various power supplies from main supply to
backup battery. In the system which operates with a
backup battery, the included free registers can be used as
the function for user’s backup memory. Users always
can take back the information in the registers which is
stored before power-off the main power supply, after the
voltage is restored.
The IC has the function to correct advance / delay of the
clock data speed, in the wide range, which is caused by
the oscillation circuit’s frequency deviation. Correcting
according to the temperature change by combining this
function and a temperature sensor, it is possible to make
a high precise clock function which is not affected by
the ambient temperature.


  • Low current consumption: 0.3μA typ. (VDD=3.0V, TA = 25°C)
  • Wide operating voltage range: 1.35 to 5.5 V
  • Minimum time keeping operation voltage: 1.25 V
  • Built-in clock adjustment function
  • Built-in free user register
  • 3-wire (micro wire) CPU interface
  • Built-in alarm interrupter
  • Built-in flag generator at power down or power on
  • Auto calendar up to the year 2099, automatic leap year calculation function
  • Built-in constant voltage circuit
  • Built-in 32 kHz crystal oscillator circuit
  • Package: SOIC-8L, TSSOP-8L, and TDFN2x3-8L

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Time Display 12, 24
Interface 3-Wire
Alarm Interrupt 1
Battery Backup 0
Clock Calibration 1

Technical Documents

Recommended Soldering Techniques


Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

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