APR3103-15BC-TR Просмотр технического описания (PDF) - Anpec Electronics

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APR3103-15BC-TR

MicroPower Microprocessor Reset Circuit with Manual Reset

Anpec Electronics 

APR3101/2/3

Application Information

VCC Transient Rejection

The APR3101/2/3 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.

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 APR3102, a pull-up resis-

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

VCC below 1.2V.(

VCC

VCC

Manual Reset Input

RESET

Force the MR low asserts the reset signal, asserted

reset continues as long as MR is low and after the

MR goes high the reset signal is maintained for a fixed

timeout period. The MR is internally connected a 47kΩ

resistor to VCC, so it can be floating if MR is not used.

The MR input also has a debounce time 500ns to avoid

the glitches. It allows use of a mechanical switch or a

TTL, and CMOS logic signal.

GND

100K

Figure 1. Ensuring RESET Valid to VCC = 0 V

+3.3V

+5.0V

Reset Output

VCC

VCC

The APR3101/2/3 have 3 output stage versions:

APR3101 is an active low push-pull output,when the

VCC drops below the reset threshold or MR goes low,

the RESET output generates a low signal. APR3102

is an active high push-pull output, when the VCC drops

below the reset threshold or MR goes low; the RE-

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

APR3103 is an active low open drain output, the RE-

SET 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 APR3101

RESET output is valid until the VCC=1.2V, below 1.2V

APR3103

MR RESET

GND

100k

RESET 5V

INPUT System

GND

Figure 2. APR3103 Open Drain Output with Multiple

Supplies

Copyright  ANPEC Electronics Corp.

10

Rev. A.2 - Oct., 2003

www.anpec.com.tw

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