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HT47R20A-1 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT47R20A-1 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
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6 / 43 page  A.C. Characteristics Ta=25 °C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions fSYS1 System Clock (Crystal OSC) ¾ 2.2V~5.5V 400 ¾ 4000 kHz ¾ 3.3V~5.5V 400 ¾ 8000 kHz fSYS2 System Clock (RC OSC) ¾ 2.2V~5.5V 400 ¾ 4000 kHz ¾ 3.3V~5.5V 400 ¾ 8000 kHz fSYS3 System Clock (32768Hz Crystal OSC) ¾¾ ¾ 32768 ¾ Hz fRTCOSC RTC Frequency ¾¾ ¾ 32768 ¾ Hz fTIMER Timer I/P Frequency ¾ 2.2V~5.5V 0 ¾ 4000 kHz ¾ 3.3V~5.5V 0 ¾ 8000 kHz tWDTOSC Watchdog Oscillator Period 3V ¾ 45 90 180 ms 5V ¾ 35 65 130 ms tRES External Reset Low Pulse Width ¾¾ 1 ¾¾ ms tSST System Start-up Timer Period ¾ Wake-up from HALT ¾ 1024 ¾ tSYS tINT Interrupt Pulse Width ¾¾ 1 ¾¾ ms HT47R20A-1/HT47C20-1 Rev. 1.70 6 June 14, 2005 |
Similar Part No. - HT47R20A-1 |
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