Datasheet AAT3524IGY-4.63-200-T1, AAT3524IGY-4.38-200-T1, AAT3524IGY-2.93-200-T1, AAT3524IGY-2.63-200-T1, AAT3524 Datasheet (Analogic Technologies)

AAT3520/2/4

MicroPower Microprocessor Reset Circuit

Typical Application

*AAT3524 Only

AAT3520
AAT3522
AAT3524

uP

V

CC

V

CC

V

CC

RESET

(RESET)

GNDGND

RESET

INPUT

100k
(nominal)

*

Preliminary Information

3520.2002.2.0.9 1

General Description

The AAT3520 Series of PowerManager™ products
is a member of AATI's Total Power Management
IC™ (TPMIC™) product family. These micro­processor reset circuits are ideal for monitoring volt­age supplies in portable systems, where extended
battery life is critical. They provide a low cost, reli­able solution by eliminating external components.
The AAT3520 series operates by monitoring the
system power supply voltage. When the input volt­age drops below a fixed threshold, the device
asserts a reset signal for a fixed time period after
VCChas risen back above the fixed threshold; 30ms
and 150ms minimum periods are available. The
AAT3520 product series is guaranteed to operate
down to 1.2V and designed to ignore fast line tran­sients appearing on V

CC

. The AAT3520 series is
available with three output stage versions: AAT3520
push-pull active high output, AAT3522 push-pull
active low output and AAT3524 open drain active
low output. The quiescent supply current is
extremely low, typically 1µA, making it ideal for
portable battery operated equipment.

The AAT3520/2/4 are available in a 3 pin SOT23
package and are specified over -40° to 85°C oper­ating temperature range.

Features

• 1.2V to 5.5V Input voltage range

• Operation down to 1.2V

• Extremely low quiescent current: less than 2µA

• High accuracy detection threshold: ±1.5%

• Monitor Power Supply Voltages

• Fixed thresholds from 2.2V to 4.6V

• Reset pulse width options

• Minimum 30 ms or 150ms

• Fast propagation delay <20µs

• Available output configurations:

• Open-drain output

• CMOS active high output

• CMOS active low output

• Temp range -40 to 85°C

• 3 pin SOT23 package

Applications

• Notebook Computers

• Cell Phones

• Portable Electronics

• Embedded Systems

• Intelligent Instruments

PowerManager

™

Pin Descriptions

AAT3520, 3522, 3524 (SOT23-3)

Part Number Descriptions

Pin Configuration

SOT-23

(Top View)

1

2

3

(RESET) RESET

V

CC

GND

SOT23-3 Part Number Part Description

AAT3520 Reset Output Push Pull Active High with Delay

AAT3522 Reset Output Push Pull Active Low with Delay

AAT3524 Reset Output Open Drain Active Low with Delay

Pin # Symbol Function

1 GND Ground connection

RESET RESET output remains high while VCCis below the reset threshold

2

(AAT3520) and remains so for a fixed time period after VCCraises above the

reset threshold.

RESET RESET output remains low while VCCis below the reset threshold

(AAT3522, and remains so for a fixed time period after VCCraises above the

AAT3524) reset threshold

3 Vcc Supply Voltage (+1.2V to +5.5V)

AAT3520/2/4

MicroPower Microprocessor Reset Circuit

2 3520.2002.2.0.9

AAT3520/2/4

MicroPower Microprocessor Reset Circuit

3520.2002.2.0.9 3

Absolute Maximum Ratings (T

A

=25°C unless otherwise noted)

Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at con­ditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time.

Thermal Information

Note 1: Mounted on an FR4 board.

Electrical Characteristics (V

IN

= 5V, TA= -40 to 85°C unless otherwise noted. Typical values

are at TA=25°C, VCC= 5V for 4.63/4.38V versions, VCC= 3.3V for 3.08/2.93V versions, VCC= 3.0V for 2.63V
version and VCC= 2.5V for 2.32/2.2V versions )

Symbol Description Conditions Min Typ Max Units

V

CC

Operation Voltage

T

A

= 0ºC to +70ºC 1.0 5.5

V

TA= -40ºC to +85ºC 1.2 5.5

I

Q

Quiescent Current

V

CC

= 5.5V 1.05 3

µA

VCC= 3V 0.85 2

V

TH

RESET Threshold (Table 1)

T

A

= 25ºC VTH-1.5% VTHVTH+1.5%

V

TA= -40ºC to +85ºC VTH-2.5% VTHVTH+2.5%

∆VTH/°C RESET Threshold Tempco 40 ppm/°C

t

P

RESET Propagation Delay VCC= VTHto (VTH-100mV) 15 µs

-50 option 30 50 100

t

RDY

RESET Active Timeout Period

-200 option 150 250 400

ms

I

SINK

=1.6mA, VCC> 2.1V, 0.3

V

OL

RESET Low Output Voltage RESET asserted

V

AAT3522, AAT3524 I

SINK

=100µA, VCC>1.2V, 0.4

RESET asserted

V

OH

RESET High Output Voltage I

SOURCE

= 800 µA VCC-1.5 V

AAT3522

I

SINK

=1.2mA, VCC> 1.2V, 0.3

V

OL

RESET Low Output Voltage RESET not asserted

V

AAT3520 I

SINK

= 3.2mA, VCC> 4.5V, 0.4
RESET not asserted
I

SOURCE

= 500µA, VCC> 2.1V, 0.8V

CC

V

OH

RESET High Output Voltage RESET asserted

V

AAT3520 I

SOURCE

= 50µA, VCC> 1.2V, 0.8V

CC

RESET asserted

I

DOFF

RESET leakage current, AAT3524 VCC> V

TH

1µA

Symbol Description Value Units

Θ

JA

Maximum Thermal Resistance (SOT23-3)

1

200 °C/W

P

D

Maximum Power Dissipation (SOT23-3)

1

320 mW

Symbol Description Value Units

V

CC

VCCto GND -0.3 to 5.5 V

V

RESET

RESET to GND (Push-Pull Output) -0.3 to VCC+0.3 V
RESET to GND (Open Drain Output) -0.3 to 5.5

I

MAX

Maximum Continuous Input Current 20 mA

I

RESET

RESET/RESET Current 20 mA

dVcc/dt Rate of rise of Vcc 100 V/µs

T

J

Operating Junction Temperature Range -40 to 150 °C

T

LEAD

Maximum Soldering Temperature (at Leads) for 10s 300 °C

AAT3520/2/4

MicroPower Microprocessor Reset Circuit

4 3520.2002.2.0.9

Typical Characteristics

Maximum Transient Duration

vs. Reset Threshold Overdrive

0

50

100

150

200

250

300

350

400

1 10 100 1000

Reset Threshold Overdrive,

VTH-V

CC

(mV)

Maximum Transient

Duration (µS)

Power-Down Reset Propagation

Delay vs. Temperature

0

5

10

15

20

25

30

-40 -20 0 20 40 60 80

Temperature (°C)

Reset Propagation Delay (µs)

VOD=10mV

VOD=100mV

Normalized Power-Up Reset Timeout

vs. Temperature

0.5

0.6

0.7

0.8

0.9

1

1.1

1.2

1.3

1.4

1.5

-40 -20 0 20 40 60 80 100

Temperature (°C)

Normalized Power-Up

Reset Timeout (ms)

Normalized Reset Threshold

vs. Temperature

0.997

0.998

0.999

1.000

1.001

1.002

1.003

-40 -20 0 20 40 60 80

Temperature (°C)

Normalized Threshold

Supply Current vs. Temperature

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

-40 -20 0 20 40 60 80

Temperature (°C)

Supply Current (µA)

VCC=5V

VCC=3V

AAT3520/2/4

MicroPower Microprocessor Reset Circuit

3520.2002.2.0.9 5

Functional Description

General

During start-up, the reset pin on a microprocessor
ensures that it is fully reset and starts up in a known
condition. The AAT3520 series of microprocessor
reset devices monitor the supply voltage to a micro­processor and assert a reset signal whenever the

V

CC

voltage falls below a factory programmed
threshold. This threshold is accurate within +/-1.5%
at 25ºC and within +/- 2.5% over the entire operat­ing temperature range. The reset signal remains
asserted for a fixed time period (t

RDY

) after VCChas
risen above the threshold as shown in Figure 1.
See Ordering Information for available RESET
active timeout periods

Functional Block Diagram

Reset

Generator

+ Timer

Oscillator

V

CC

GND

RESET
(RESET)

V

REF

Figure 1: Reset Timing Diagram (AAT3522, AAT3524)

V

RESET

CC

V

TH

V

TH

V

TH

t

RDY

t

RDY

Applications Information

Reset Output Options

The AAT3524 has an active low open drain output
and the AAT3520/2 have a push-pull output. The
AAT3524 may be used in multiple voltage systems,
with an external pull-up resistor. This allows the
AAT3524 to interface to microprocessors with high­er 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 VCCdrops below

1.2V. To ensure validity down to ground an external
100kΩ resistor should be connected between the
RESET output and GND.

Supply Voltage Transient Behavior

In some cases fast negative transients of short dura­tion can appear on the VCCpower supply. The
AAT3520 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 overdrive. 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. typically 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 VCCpin as possible.

AAT3520/2/4

MicroPower Microprocessor Reset Circuit

6 3520.2002.2.0.9

Figure 2: Using AAT3524 Open Drain Output with Multiple Supplies

AAT3524

5V

System

+3.3V

V

CC

V

CC

RESET

100k

GNDGND

RESET

INPUT

+5.0V

Factory Trimmed Reset Thresholds* and Ordering Information Table 1

*Contact Local Sales Office for custom trimmed options

Reset Threshold Voltage, VTH(V)

Ordering Minimum

TA= 25ºC TA= 40 to 85ºC

Part Number Marking Reset Active (ms)

Min Typ Max Min Max

AAT3520IGY-2.32-200-T1 150
AAT3522IGY-2.32-200-T1 150 2.285 2.320 2.355 2.262 2.378
AAT3524IGY-2.32-200-T1 150

AAT3520IGY-2.63-200-T1 150
AAT3522IGY-2.63-200-T1 150 2.591 2.630 2.669 2.564 2.696
AAT3524IGY-2.63-200-T1 150

AAT3520IGY-2.93-200-T1 150
AAT3522IGY-2.93-200-T1 150 2.886 2.930 2.974 2.857 3.003
AAT3524IGY-2.93-200-T1 150

AAT3520IGY-3.08-50-T1 30
AAT3520IGY-3.08-200-T1 150
AAT3522IGY-3.08-50-T1 30 3.034 3.080 3.126 3.003 3.157
AAT3522IGY-3.08-200-T1 150
AAT3524IGY-3.08-200-T1 150

AAT3520IGY-4.38-200-T1 150
AAT3522IGY-4.38-200-T1 150 4.314 4.380 4.446 4.271 4.490
AAT3524IGY-4.38-200-T1 150

AAT3520IGY-4.63-200-T1 150
AAT3522IGY-4.63-200-T1 150 4.561 4.630 4.699 4.514 4.746
AAT3524IGY-4.63-200-T1 150

AAT3520/2/4

MicroPower Microprocessor Reset Circuit

3520.2002.2.0.9 7

Package Information

SOT23-3

E

S1

D

S

e

H

L

C

b

A1

A2

A

Θ

1

AAT3520/2/4

MicroPower Microprocessor Reset Circuit

8 3520.2002.2.0.9

Advanced Analogic Technologies, Inc.

1250 Oakmead Parkway, Suite 310, Sunnyvale, CA 94086
Phone [phone]
Fax [phone]

Dim

Millimeters Inches

Min Max Min Max

A .887 1.02 0.034 .040
A1 .013 0.10 0.0005 .004
A2 - - - -

b 0.37 0.51 0.015 0.020
C 0.085 0.180 0.003 0.007
D 2.80 3.04 0.110 0.120
E 1.20 1.40 0.047 0.055

e 1.78 2.05 0.070 0.080
H 2.10 2.64 0.083 0.104

L - 0.69 - 0.027
S 0.45 0.60 0.018 0.024

S1 0.89 1.03 0.035 0.040

θ1 0° 8° 0° 8°

Note:

1. PACKAGE BODY SIZE EXCLUDE MOLD FLASH
PROTRUSIONS OR GATE BURRS.

2. TOLERANCE ±0.1000 mm (4mi) UNLESS OTHER­WISE SPECIFIED

3. COPLANARITY: 0.1000

4. DIMENSION L IS MEASURED IN GAGE PLANE