ASM1810 查看數據表（PDF） - Alliance Semiconductor

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ASM1810

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

Alliance Semiconductor 

February 2005

ASM1810

rev 1.4

Application Information

Operation - Power Monitor

The ASM1810 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

approximately 150ms after the power supply voltage has

reached the selected tolerance. This allows the power supply

VCC

and microprocessor to stabilize before RESET is released.

VCCTP (MIN)

tR

VCCTP (MAX)

VCCTP

tRPU

ASM1810

RESET

Microprocessor

RESET

100kΩ

RESET

Figure 2: Timing Diagram: Power-Up

VOH

Figure 1: RESET Valid to 0V VCC

Output Conditions

The ASM1810 active LOW reset signal is valid as long as VCC

remains above 1.2V. However the RESET output on the

ASM1810 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 1). 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.

VCC

tF

VCCTP (MAX)

VCCTP

VCCTP (MIN)

RESET

tRPD

VOL

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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