APR3001 查看數據表（PDF） - Anpec Electronics

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APR3001

MicroPower Microprocessor Reset Circuit

Anpec Electronics 

APR3001/2/3

Application Information

VCC Transient Rejection

The APR3001/2/3 have the function to reject the tran-

sient glitches from the power line. The Maximum Tran-

sient 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 have the duration more than 35us, it

will generate a reset signal. Connect a 0.1uF bypass

capacitor to the VCC pin can improve the transient

immunity.

VCC

VCC

RESET

GND

100K

Figure 1. Ensuring RESET Valid to VCC = 0 V

Reset Output

+3.3V

+5.0V

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

APR3001 is an active low push-pull output, when the

VCC drops below the reset threshold, the RESET out-

put generates a low signal. APR3002 is an active high

push-pull output, when the VCC drops below the reset

threshold, the RESET output generates a high signal

(see Timing Chart). APR3003 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 APR3001 RESET output is valid until

the VCC=1.2V, below 1.2V 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

ground to keep the reset output low (see Figure 1).

For The APR3002, a pull-up resistor to VCC is required

to keep the valid reset output for VCC below 1.2V.

VCC

APR3003

RESET

GND

VCC

100k

RESET 5V

INPUT System

GND

Figure 2. APR3003 Open Drain Output with Multiple

Supplies

Copyright  ANPEC Electronics Corp.

9

Rev. A.3 - Feb., 2004

www.anpec.com.tw

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