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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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HT48RA3 数据表(PDF) 5 Page - Holtek Semiconductor Inc |
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HT48RA3 数据表(HTML) 5 Page - Holtek Semiconductor Inc |
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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 tACC Data ROM Access Time ¾¾ 1 ¾¾ ms Note: tSYS=1/(fSYS) HT48RA3/HT48CA3 Rev. 1.30 5 October 12, 2007 |
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