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HT49C50 Datasheet(PDF) 8 Page - Holtek Semiconductor Inc |
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HT49C50 Datasheet(HTML) 8 Page - Holtek Semiconductor Inc |
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8 / 52 page  Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions IOH I/O Ports Source Current 3V VDD=3V, VOH=2.7V -1 -1.5 ¾ mA 5V VDD=5V, VOH=4.5V -2 -3 ¾ mA RPH Pull-high Resistance of I/O Ports and INT0, INT1 3V ¾ 40 60 80 kW 5V ¾ 10 30 50 kW A.C. Characteristics Ta=25°C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions fSYS1 System Clock (Crystal OSC) 3V VDD=3V 455 ¾ 4000 kHz 5V VDD=5V 455 ¾ 4000 kHz fSYS2 System Clock (RC OSC) 3V VDD=3V 400 ¾ 2000 kHz 5V VDD=5V 400 ¾ 3000 kHz fTIMER Timer I/P Frequency (TMR0/TMR1) 3V VDD=3V 0 ¾ 4000 kHz 5V VDD=5V 0 ¾ 4000 kHz tWDTOSC Watchdog Oscillator 3V VDD=3V 45 90 180 ms 5V VDD=5V 35 65 130 ms tRES External Reset Low Pulse Width ¾¾ 1 ¾¾ ms tSST System Start-up Timer Period ¾ Power-up or wake-up from halt ¾ 1024 ¾ tSYS tINT Interrupt Pulse Width ¾¾ 1 ¾¾ ms Note: tSYS= 1/fSYS HT49C50 8 August 18, 1999 |
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