ASM1812 查看數據表（PDF） - Alliance Semiconductor

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ASM1812

Low Power 5V µP Reset Active HIGH, Push-Pull Output

Alliance Semiconductor 

February 2005

rev 1.4

Application Information

Operation - Power Monitor

The ASM1812 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 approximately 150ms after the power

supply voltage has reached the selected tolerance. This

allows the power supply and microprocessor to stabilize

before RESET is released.

ASM1812

RESET

Microprocessor

RESET

ASM1812

VCCTP (MIN)

tR

VCCTP (MAX)

VCCTP

VCC

tRPU

RESET

VOL

Figure 2: Timing Diagram: Power-Up

Figure 1: Typical Application

tF

VCC

VCCTP (MAX)

VCCTP

VCCTP (MIN)

tRPD

RESET

VOH

RESET Slews with VCC

Figure 3: Timing Diagram: Power-Down

Low Power 5V µP Reset

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

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