DS1810 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1810

5V EconoReset with Push-Pull Output

Dallas Semiconductor -> Maxim Integrated 

DS1810

OPERATION - POWER MONITOR

The DS1810 provides the function of detecting out-of-tolerance power supply conditions and warning a

processor-based system of impending power failure. When VCC is detected as out-of-tolerance, the RST

signal is asserted. On power-up, RST is kept active for approximately 150 ms after the power supply has

reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RST

is released.

BLOCK DIAGRAM (PUSH-PULL OUTPUT) Figure 1

APPLICATION EXAMPLE Figure 2

OUTPUT VALID CONDITIONS

All versions of the DS1810 can maintain a valid output as long as VCC remains above 1.2 volt. However,

the RST outputs on the DS1810 use a push-pull structure which can maintain a valid output below 1.2

volts on an input. To sink current below 1.2 volts, a resistor can be connected from RST to Ground (see

Figure 3). This arrangement will maintain a valid value on the RST outputs even it VCC approaches 0

volts. During both power-up and -down this arrangement will draw current when RST is in the high state.

A value of about 100 kኚ should be adequate to maintain a valid condition.

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