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MM1099 Datasheet(PDF) 4 Page - Mitsumi Electronics, Corp. |
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MM1099 Datasheet(HTML) 4 Page - Mitsumi Electronics, Corp. |
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4 / 7 page  MITSUMI System Reset (Built-in Watch Dog Timer) MM1099 Electrical Characteristics (AC) (Except where noted otherwise, MM1096A : VCC=3.6V, Ta=25°C MM1096B : VCC=5.0V) Notes : *1 The "monitoring time" means the time interval from the last pulse of the clock pulses for timer clear (negative edge) to the output of the reset pulse. If the clock pulse is not input during this time interval, the reset output will be given. *2 The "reset time" is no other than the reset pulse width, except when resetting the POWER ON. *3 The "reset hold time" is the time interval from the time point when VCC exceeds the detect (VSH) at the time of Power On Reset (Power variation reset) to the reset release (RESET ------------------------------------------------- output "HIGH"). *4 The "output delay time" means the time interval from when the supply voltage comes lower than the detect voltage (VSL) to when comes the reset state (RESET ------------------------------------------------- output "Low"). *5 The voltage range is 10 to 90% when measuring the output rise and fall times. *6 By varying the capacitance of CT, we can vary the watch dog timer monitoring time (TWD), the reset time at the time of the watch dog timer (TWR), and the reset hold time at the time of power source rise (TPR). The variable time can be expressed by the following formulas: TPR (mS) . =. 5000 CT (µF) TWD (mS) . =. 5000 CT (µF) TWR (mS) . =. 100 CT (µF) Example : When CT=0.02µF TPR . =. 100mS TWD . =. 100mS TWR . =. 2mS Item Symbol Measurement conditions Min. Typ. Max. Units MM1099A 8 VCC input TPI µS pulse width MM1099B 8 CK input pulse width TCKW 3µS CK input cycle TCK 20 µS Watchdog timer monitoring time *1 TWD CT=0.02µF 50 100 150 mS Reset time for watchdog timer *2 TWR CT=0.02µF 1 2 3 mS Reset hold time for power supply rise *3 TPR 50 100 150 mS Output delay time from VCC *4 TPD RESET ---------------------------------------------------------------------- pin, RL=10k Ω, CL=20pF 2 10 µS Output rise time *5 tR RESET ---------------------------------------------------------------------- pin, RL=10k Ω, CL=20pF 2.0 4.0 µS Output fall time *5 tF RESET ---------------------------------------------------------------------- pin, RL=10k Ω, CL=20pF 0.2 1.0 µS VCC 3.6V 2.8V VCC 5.0V 4.0V CT=0.02µF, VCC CK or |
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