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ASM1834U Datasheet(PDF) 3 Page - PulseCore Semiconductor |
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ASM1834U Datasheet(HTML) 3 Page - PulseCore Semiconductor |
3 / 10 page 3 of 10 Notice: The information in this document is subject to change without notice Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset November 2006 ASM1834/A/D rev 1.5 Detailed Description Operation Power Monitor The ASM1834 supervisors simultaneously detect out-of- tolerance power supply conditions on both 3.3V and 5V power supplies. If the voltages at 5VIN or 3.3VIN are outside the tolerance band, the reset for the falling supply voltage becomes active. When the monitored supply returns to an in- tolerance state, the reset remains active for approximately 350ms before returning to the inactive state. On power-up, the reset signals are kept active for approximately 350ms after the power supply voltages have reached the selected tolerance. This allows the power supply and microprocessor to stabilize before the reset is removed. All supply current for the ASM1834 devices is drawn from the input (5VIN or 3.3VIN) with the highest voltage level. The outputs draw current from their input supplies 5VIN and 3.3VIN. Reset Signal Polarity and Output Stage Structure The ASM1834 and the ASM1834A supervisors have active LOW reset signals. The ASM1834D reset outputs are active HIGH. The ASM1834 and the ASM1834D have CMOS push-pull output stages. The ASM1834A has open drain reset outputs. Part # RESET Polarity Output Stage Configuration ASM1834 LOW Push-Pull ASM1834U LOW Push-Pull ASM1834S LOW Push-Pull ASM1834A LOW Open Drain ASM1834AU LOW Open Drain ASM1834AS LOW Open Drain ASM1834D HIGH Push-Pull ASM1834DU HIGH Push-Pull ASM1834DS HIGH Push-Pull VOH VOL tRPU RESET RESET VINTP(MIN) VINTP(MAX) VINTP tR VIN Figure 1: Timing Diagram: Power Up (ASM1834D only) VOH VOL VINTP (MAX) VINTP VINTP (MIN) RESET RESET tF VIN tRPD Figure 2: Timing Diagram: Power Down (ASM1834D only) RESET Slews with VCC |
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Similar Description - ASM1834U |
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