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MB3892 Datasheet(PDF) 36 Page - Fujitsu Component Limited. |
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MB3892 Datasheet(HTML) 36 Page - Fujitsu Component Limited. |
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36 / 40 page  MB3892 36 s s s s POWER-ON RESET TIMING DIAGRAM s s s s SETTING OF HOLD TIME FOR POWER-ON RESET According to the time constant set by capacitor (CTP) connected to CTP terminal (pin 76), rise time (hold time) of RESET terminal (pin 77) voltage can be set after OUT1 terminal (pin 75) voltage exceeds 2.75V (typ.). (1) When the OUT1 terminal (pin 75) voltage exceeds detected rising voltage (2.75V typ.), the charge for timing capacitor (CTP) for hold time for power-on reset starts . (2) When the CTP terminal (pin 76) voltage exceeds 1.23V (typ.), the reset is canceled. (The RESET ter- minal voltage becomes "H" level from "L" level.: rising time from 10% to 90% = tr) (3) When OUT1 terminal voltage falls below detected rising voltage (2.685V typ.), the CTP terminal voltage is down and the reset signal is output. (RESET terminal voltage becomes "L" level from "H" level.) (4) When OUT1 terminal voltage exceeds rising voltage detect, charging of CTP is started. (5) When CTP terminal voltage rises above threshold voltage, the reset is canceled. (6) When OUT1 terminal voltage falls below the voltage detect, the reset signal is output. OUT1 2.75 V CTP RESET 1.23 V 2.685 V TPR TPR 90 % tr 10 % 90 % tf 10 % 90 % tr 10 % 90 % tf 10 % (1) (2) (3) (4) (5) (6) POR hold time : TPR (s) := (tr of RESET is not included) 1.23 (V) × CTP (µF) 1.75 ( µA) |
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