ASM1815 查看數據表（PDF） - Alliance Semiconductor

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ASM1815

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

Alliance Semiconductor 

February 2005

rev 1.4

Application Information

Operation - Power Monitor

The ASM1815 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 (LOW) 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.

VCCTP (MIN)

tR

VCCTP (MAX)

VCCTP

VCC

tRPU

RESET

Figure 1: Timing Diagram: Power-Up

VOH

ASM1815

VCC

RESET

tF

VCCTP (MAX)

VCCTP

VCCTP (MIN)

tRPD

VOL

Figure 2: Timing Diagram: Power-Down

Output Conditions

The ASM1815 active LOW reset signal is valid as long as

VCC remains below 1.2V. The RESET output on the

ASM1815 uses a push-pull drive stage that can maintain a

valid output below 1.2V. To sink current with VCC below 1.2V,

a resistor can be connected from the reset pin (RESET) to

Ground (see Figure 3). This configuration will give a valid

value on the RESET output with VCC approaching 0V. During

both power up and down, this configuration will draw current

when the RESET is in the high state. A value of 100kΩ

should be adequate to maintain a valid connection.

ASM1815

RESET

Microprocessor

RESET

100kΩ

Figure 3: RESET Valid to 0V VCC

Low Power, 3.3V/3.0V µP Reset

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

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