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HT49C50L Datasheet(PDF) 7 Page - Holtek Semiconductor Inc |
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HT49C50L Datasheet(HTML) 7 Page - Holtek Semiconductor Inc |
7 / 44 page A.C. Characteristics VDD=1.5V for HT49C50L, VDD=3V&VDD=5V for HT49R50A-1 and HT49C50-1 Ta=25 °C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions fSYS1 System Clock (Crystal OSC) ¾ 1.2V~2.2V (for HT49C50L) 400 ¾ 500 kHz ¾ 2.2V~5.5V 400 ¾ 4000 kHz ¾ 3.3V~5.5V 400 ¾ 8000 kHz fSYS2 System Clock (RC OSC) ¾ 1.2V~2.2V (for HT49C50L) 400 ¾ 500 kHz 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 1.2V~2.2V (for HT49C50L) 0 ¾ 500 kHz ¾ 2.2V~5.5V 0 ¾ 4000 kHz ¾ 3.3V~5.5V 0 ¾ 8000 kHz tWDTOSC Watchdog Oscillator Period 1.5V ¾ 35 70 140 ms 3V 45 90 180 ms 5V 32 65 130 ms tRES External Reset Low Pulse Width ¾ For HT49C50L 10 ¾¾ ms For HT49R50A-1/HT49C50-1 1 ¾¾ ms tSST System Start-up Timer Period ¾ Wake-up from HALT ¾ 1024 ¾ *tSYS tLVR Low Voltage Width to Reset ¾¾ 0.25 1 2 ms tINT Interrupt Pulse Width ¾ For HT49C50L 10 ¾¾ ms For HT49R50A-1/HT49C50-1 1 ¾¾ ms Note: *tSYS= 1/fSYS1, 1/fSYS2 or 1/fSYS3 HT49R50A-1/HT49C50-1/HT49C50L Rev. 2.20 7 December 16, 2009 |
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