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HT48RA3 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT48RA3 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
5 / 38 page A.C. Characteristics Ta=25 °C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions fSYS1 System Clock (Crystal OSC) ¾ 2.0V~5.5V 400 ¾ 4000 kHz ¾ 3.3V~5.5V 400 ¾ 8000 kHz fSYS2 System Clock (RC OSC) ¾ 2.0V~5.5V 400 ¾ 4000 kHz ¾ 3.3V~5.5V 400 ¾ 8000 kHz fTIMER Timer I/P Frequency (TMR0/TMR1) 3V 50% duty 0 ¾ 4000 kHz 5V 0 ¾ 8000 kHz tWDTOSC Watchdog Oscillator Period 3V ¾ 45 90 180 ms 5V 32 65 130 ms tWDT1 Watchdog Time-out Period (WDT OSC) 3V Without WDT prescaler 11 23 46 ms 5V 8 17 33 ms tWDT2 Watchdog Time-out Period (fSYS/4) ¾ Without WDT prescaler ¾ 1024 ¾ tSYS tRES External Reset Low Pulse Width ¾¾ 1 ¾¾ ms tSST System Start-up Timer Period ¾ Power-up reset or wake-up from HALT ¾ 1024 ¾ tSYS tLVR Low Voltage Width to Reset ¾¾ 1 ¾¾ ms tINT Interrupt Pulse Width ¾¾ 1 ¾¾ ms Note: tSYS=1/(fSYS) Power-on Reset Characteristics Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions VPOR VDD Start Voltage to Ensure Power-on Reset ¾¾ ¾ ¾ 0mV RRVDD VDD raising rate to Ensure Power-on Reset ¾¾ 0.05 ¾¾ V/ms tPOR Minimum Time for VDD Stays at VPOR to Ensure Power-on Reset ¾¾ 200 ¾¾ ms HT48RA3/HT48CA3 Rev. 1.50 5 June 29, 2009 T i m e V D D V P O R R R V D D t P O R |
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