ASM1817-20F 查看數據表（PDF） - Alliance Semiconductor

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ASM1817-20F

Low Power, 3.3V/3.0V µP Reset, Active HIGH, Push-Pull Output

Alliance Semiconductor 

February 2005

rev 1.5

Application Information

Operation - Power Monitor

The ASM1817 detects out-of-tolerance power supply

conditions. It resets a processor during power-up, power-

down and issues a reset to the system processor when the

monitored power supply voltage is below the reset threshold.

When an out-of-tolerance VCC voltage is detected, the

RESET signal is asserted. On power-up, RESET is kept

active (HIGH) for approximatley 150ms after the power

supply voltage has reached the selected tolerance. This

allows the power supply and microprocessor to stablize

before RESET is released.

VCC

RESET

ASM1817

VCCTP (MIN)

tR

VCCTP (MAX)

VCCTP

tRPU

VOL

ASM1817

RESET

Microprocessor

RESET

Figure 1: Typical Application

Figure 2: Timing Diagram: Power-Up

tF

VCC

VCCTP (MAX)

VCCTP

VCCTP (MIN)

tRPD

RESET

VOH

RESET Slews with VCC

Figure 3: Timing Diagram: Power-Down

Low Power, 3.3V/3.0V µP Reset

Notice: The information in this document is subject to change without notice

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