Datasheet > AAT3527ICX-463-200-T1

AAT3527ICX-463-200-T1

更新时间： 2022-11-25 16:10:28

品牌	Logo	应用领域
ANALOGICTECH		监控
页数	文件大小	规格书
10页	225K
描述
MicroPower Supervisory Circuit with Manual Reset

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AAT3526/7/8

MicroPower Supervisory Circuit with Manual Reset

input is internally debounced which allows use of a

mechanical switch. It should be a normally-open

momentary switch connected from MR to GND.

Additionally, the MR pin can be driven from TTL,

Applications Information

Reset Output Options

The AAT3528 has an active low open drain output

and the AAT3526/7 have a push-pull output. The

AAT3528 may be used in multiple voltage systems,

with an external pull-up resistor. This allows the

AAT3528 to interface to microprocessors with high-

er supply voltages up to 5.5V (Figure 2). In the

event of a power down or brown-out condition the

reset signal remains valid until the V_CCdrops below

1.2V. To ensure validity down to ground an external

100kΩ resistor should be connected between the

RESET output and GND.

CMOS, or open drain logic outputs.

Supply Voltage Transient Behavior

In some cases fast negative transients of short dura-

tion can appear on the V_CCpower supply. The

AAT3526/7/8 series devices provide some immunity

to line transients which can generate invalid reset

pulses. Figure 1 shows typical behavior to short

duration pulses verses RESET comparator over-

drive. As shown in the Maximum Transient Duration

vs. Reset Threshold Overdrive graph, when the

transient voltage becomes larger, the time allowed

before asserting a reset becomes shorter. e.g. typi-

cally a transient of 100mV below the reset threshold

would have to present for more than 50µs to cause

a reset. Immunity can be increased by the addition

of a small by-pass capacitor of 0.1µF connected as

close to the V_CCpin as possible.

Manual Reset Input

A logic low signal on MR asserts a reset condition.

Reset continues to be asserted as long as MR is low

and for a minimum of 150ms after MR returns high.

This input is internally pulled up to V_CCvia a 20kΩ

resistor, so leaving the pin unconnected is accept-

able if manual reset function is not needed. The MR

+3.3V

+5.0V

V_CC

100k

AAT3528

System

RESET

INPUT

RESET

GND

Figure 2: Using AAT3528 Open Drain Output with Multiple Supplies

3526.2002.1.0.62

1...4 5 678 9 10

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