APR3011 查看數據表（PDF） - Anpec Electronics

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APR3011

MicroPower Microprocessor Reset Circuit

Anpec Electronics 

APR3011/2/3

Application Information

V Transient Rejection

CC

The APR3011/2/3 have the function to reject the transient

glitches from the power line. The Maximum Transient

Duration vs. Reset Threshold Overdrive shows at Typical

Characteristics.The transient voltage with the duration

under the curve will not generate a reset signal, e.g. a

transient of 100mV below the reset threshold voltage has

the duration more than 35µs, it will generate a reset signal.

Connect a 0.1µF bypass capacitor to the VCC pin can im-

prove the transient immunity.

Reset Output

The APR3011/2/3 have 3 output stage versions: APR3001

is an active low push-pull output. When the V drops

CC

below the reset threshold, the RESET output generates

a low signal. APR3012 is an active high push-pull output.

When the V drops below the reset threshold, the RE-

CC

SET output generates a high signal (see Timing Chart).

APR3013 is an active low open drain output, the RESET

output must be connected a pull-up resistor to a supply

voltage that is lower than 6V, it suits to use in multiple

voltage systems (see Figure 2). The APR3011 RESET

output is valid until the V =1.2V; when it is below 1.2V,

CC

the IC is shutdown, and the output becomes a floating

state. If it is a trouble, a resistor should be connected

from reset output to the ground to keep the reset output

low (see Figure 1). For the APR3012, a pull-up resistor to

VCC is required to keep the valid reset output for VCC below

1.2V.

VCC

VCC

RESET

GND

100K

Figure 1. Ensuring RESET Valid to VCC = 0 V

+3.3V

+5.0V

VCC

APR3013

RESET

GND

VCC

100K

RESET 5V

INPUT System

GND

Figure 2. APR3013 Open Drain Output with Multiple Supplies

Copyright © ANPEC Electronics Corp.

9

Rev. A.4 - Jan., 2009

www.anpec.com.tw

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