Analog Microelectronics AME8530AEEVLFX46, AME8530AEEVLFX44, AME8530AEEVLFX31, AME8530AEEVLFX29, AME8530AEEVLFX26 Datasheet

AME, Inc.

1

AME8510 / 8520 / 8530

Micropower

µµ

µµ

µP Watch Dog Timer

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n Features

l Small packages: SOT-23-5
l 7 voltage threshold options
l Tight voltage threshold tolerance --- ±1.50%

l 12 output driver configuration options

l Wide temperature range -------- -45

o

C to 85oC

l Low temperature coefficient --- 100ppm/

o

C (max)

l Low quiescent current < 3.0µA
l 3 bonding options

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n General Description

The AME8510/8520/8530 family allows the user to cus­tomize the CPU monitoring function without any external
components. The user has a large choice of reset volt­age thresholds and output driver configurations, all of
which are preset at the factory . Each wafer is trimmed
to the customer's specifications.

These circuits will ignore fast negative going transients
on VDD. The state of the reset output is guaranteed to be
correct down to 1V .

After VDD crosses above a factory preset threshold, the
AME8510/8520/8530 assert a reset signal. After a pre­determined time (the “reset” interval) the reset is
deasserted. If VDD ever drops below the threshold volt­age a reset is asserted immediately. In addition to a
supply monitoring function the AME8510/8520 also moni­tor transitions at the watch dog (WDI) input. If a logic
transition does not occur at the WDI pin within a certain
time interval (the “watchdog” interval) then a reset is as­serted. The reset deasserts after the reset interval, as
explained earlier.

The AME8510/8530 can both assert a reset manually
by pulling the MRB input to ground.

Space saving SOT25 packages and micropower quies­cent current make this family a natural for portable bat­tery powered equipment.

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n Applications

l Motherboards
l Computer peripherals
l Portable electronics
l Applications using CPUs
l Consumer electronics

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n Pin Configuration

SOT-25 Top View

AME8510

AME8511

AME8510

V

DD

WDI

RESET/
RESETB

GND

MRB

AME8510

AME8511

AME8520

V

DD

WDI

GND

RESET/
RESETB

RESETB/
RESET

V

DD

MRB

GND

RESET/
RESETB

RESETB/
RESET

AME8530

AME851

AME8530

AME, Inc.

2

AME8510 / 8520 / 8530

Micropower

µµ

µµ

µP Watch Dog T imer

AME8530

AME851

8510/20/30

WDI/MRB

PIN 1 PIN 3

GND

V

DD

n

O rd eri n g I n f o rm a t i o n

AM E8510AEEV X X X XX
AM E8520A EEV X X X XX
AM E8530A EEV X X X XX

VDD Threshold Voltage

22: VTH=2.19V
23: V

TH

=2.32V

26: V

TH

=2.63V

29: V

TH

=2.93V

31: V

TH

=3.08V

44: V

TH

=4.38V

46: V

TH

=4.63V

Watch Dog Interval (T

WDNOM

)

E: TD=1760m S
X: Without WDI option

Reset Time (T

D2NOM

)

F: TD=210m S

Outp ut Driver Option

Polari ty * Polari ty *
A: RESETB PP N/A N/A
B: RESETB OD N/A N/A
C: RESET PP N/A N/A

--For example-- D: RESET OD N /A N/A
AME8520AE EVEFE29 m eans: E : RESETB PP RES ET PP
Output at pin 1 is RESET B , push pull F: RESETB P P RESET O D
Output at pin 3 is RESET , push pull G: RESETB OD RE S ET P P * Output Driver Chart Explanation:
Reset time is 210m S H: RE S ET B OD RESET O D P P = Push pull output
Watch dog interval is 1760mS I: RES ET P P RES ET B P P OD = O pen drain output
V

DD

threshold voltage is 2.93V J: RES ET P P RES ET B OD N/A = Not available (8510)

No temperature shutdown K: RESET OD RE S ET B PP RESET = Active high

L: RESET OD RESETB OD RESETB = A ct ive low

Please consult AME sales office or authorized Rep. for other RESET TIME interval and Watch Dog time interval.

Pin 1 Pin 3

AME, Inc.

3

AME8510 / 8520 / 8530

Micropower

µµ

µµ

µP Watch Dog Timer

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n Absolute Maximum Ratings

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n Recommended Operating Conditions

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n Thermal Information

Caution: Stress above the listed absolute rating may cause permanent damage to the device

Maximum Unit

6V

B

Maximum Unit

256

o

C / W

150

o

C

300

o

C

Parameter

Suppl y Volt age
ESD Classification

Para mete r

Ambient T em per ature R ange
Ju n ct ion Temperat ure

Suppl y Volt age

Para mete r Rating

0.9 - 5 V

Therm al R esistan ce ( SOT-25)

Maximu m Lead T em perat ure ( 10 Sec)

Maximu m Jun ct ion T em per ature

- 40 to +85

o

C

- 40 to +125 oC

AME, Inc.

4

AME8510 / 8520 / 8530

Micropower

µµ

µµ

µP Watch Dog T imer

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n Electrical Specifications

T

A

=

25oC unless otherwise noted

PARAMETER SYMBOL MIN TYP MAX UNITS

VDD Range V

RANGE

15.5V

Supply Cu rrent I

DD

310µA

Reset Threshold* V

TH

VTH - 1.5% VTH + 1.5% V

ResetB O utput Voltage Hgh VDD>VTH max

Reset Ou tput Vo ltage Hgh VDD<VTH min

ResetB O utput Voltage Low VDD<VTH min

Reset Ou tput Vo ltage Low VDD>VTH max

V

DD

to Reset Delay T

D1

VDD = VTH - 100mV 40

µ

S

Reset Timeout Period* T

D2

TA=-40~850C

V ersion F 140 210 280 mS

W atch D og Timeout Period* T

WD

1120 1760 2400 mS

WDI Pulse Width T

WDI

50 nS

WDI

IL

0.7 V

WDI

IH

0.8V

DD

V

I

IL

WDI = 0V -15 -8

I

IH

WDI = VDD = 5.0V 8 15

MRB

IL

0.7

MRB

IH

0.8V

DD

M RB Pulse Width T

WMRB

1

µ

S

M RB Noise Immunity
(pulse width with no reset)

100 nS

M RB to Reset Delay T

DMRB

500 nS

MRB P ull Up Resistance 80 120 Kohm

* See the ch art on page 2 for av ailable valu es of th is parameter.

V

OH

V

V

OL

V0.5

0.8V

DD

µ

A

VMRB I nput Threshold

W DI Input Threshold

W DI Input Current

V

DD

= V

TH

x 1.2

VDD = V

TH

x 1.2

V ersion E

TEST CONDITIONS

W DI and MR B unc onnected

I

SOURCE

=0.5mA,

TA=-40~85

0

C

I

SNK

=1.2mA,

TA=-40~85

0

C

AME, Inc.

5

AME8510 / 8520 / 8530

Micropower

µµ

µµ

µP Watch Dog Timer

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Pin Descript ion

Ground

Pin Number

This pin m ay be eit her RE S E T or
RESETB. RESETB is active low. In the
case of the AM E 8520 and A M E 8530 t hi s
pin will alway s be t he opposit e polari t y from
pin 3. This pi n c an be pus h/pull or open
drain.

111

RESET/

RESETB

222

This pin may be either RESETB or RESET.
RES E T is act ive high. In the cas e of t he
AM E 8520 and A M E 8530 t hi s pin wil l
always be t he opposit e pol arit y from pin 1.
This pin c an be eit her push/pul l or open
drain.

W at c h Dog Input. A ny transi t i on on thi s
pin will reset the wat c h dog t i m er. If this
pin remains high or low for longer than the
watc h dog int erval then a reset is as s ert ed.
Float or tri s t at e t hi s pi n t o dis abl e t he
watc h dog feature.

Manual Res et . A ct ive low. Pull ing t hi s pi n
low forces a reset . After a low t o hi gh
trans i ti on res et remai ns assert ed for
exactl y one res et ti m eout period. This pi n
is int ernall y pul led hi gh. If this funct i on is

unused t hen float t his pin or ti e it to V

DD

.

Pos i t ive power supply. A res et i s ass erted
after this voltage drops bel ow a

predetermi ned level. After V

DD

rises above

that level reset rem ains as s ert ed unt i l t he
end of the reset t im eout period.

GND

N/A 3 3

RESET/

RESETB

34N/A MRB

44N/AWDI

555V

DD

Na me Descrip tion

AME8510 AME8520 AME8530

AME, Inc.

6

AME8510 / 8520 / 8530

Micropower

µµ

µµ

µP Watch Dog T imer

nn

nn

n Detailed Description

The AME8510/8520/8530 are designed to interface with
the reset input of a microprocessor and to prevent CPU
execution errors due to power up, power down, and other
power supply errors. The AME8510/8520 also monitor
the CPU health by checking for signal transitions from
the CPU at the WDI input.

Reset Output

Each output pin in the family can be configured to be
either push/pull or open drain. In addition each output
may be either active high or active low with the condi­tion that parts with two outputs must have opposite po­larities. Active high reset outputs are denoted as RE­SET . Active low reset outputs are denoted as RESETB.
The selection guide on page 2 of this data sheet shows
all possible combinations of output driver configuration.

A reset will be asserted if any of three things happen:

1) VDD drops below the threshold (VTH)

2) The MRB pin is pulled low.

3) The WDI pin does not detect a transition within
the watch dog interval (TWD).

The reset will remain asserted for the prescribed reset
interval after:

1) VDD rises above the threshold (VTH)

2) MRB goes high

3) The watch dog timer has timed out causing the
reset to assert.

Reset Timing Diagram

Manual Reset Input

The AME8510 and AME8530 feature a manual reset fea­ture (MRB). A logic low on the MRB pin asserts a reset.
The reset remains asserted as long as the MRB pin re­mains low. After the MRB pin transitions to a high state
the reset remains asserted for the prescribed reset inter­val (TD2). The MRB pin is internally pulled up to VDD by
a 100kΩ resistor. It is internally debounced to reject
switching transients.

The MRB pin is ESD protected by diodes connected to
VDD and GND. So the MRB pin should never be driven
higher than VDD or lower than GND.

Watchdog Input

The AME8510 and AME8520 are equipped with a watch­dog input (WDI). If the microprocessor does not produce
a valid logic edge at the the watchdog input (WDI) within
the prescribed watchdog interval (TWD) then a reset as­serts. The reset remains asserted for the required reset
interval (TD2) At the end of the reset interval the reset is
deasserted and the watchdog interval timer starts again
from zero.

If the watchdog input is left unconnected or is connected
to a tri-stated buffer the watchdog function is disabled.
As soon as the WDI input is driven either low or high the
watchdog function resumes with the watchdog timer set
to zero.

Watchdog Timing Diagram

WDI

RESETB

VDD

T

WD

T

D2

T

D2

V

TH

V

DD

T

D2

V

Release

RESETB

V

TH

T

D1

T

D2

T

D1

RESET

50%

50%

50%

50%

AME, Inc.

7

AME8510 / 8520 / 8530

Micropower

µµ

µµ

µP Watch Dog Timer

Watchdog Input Current

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n Detailed Description (contd.)

The watchdog input pin (WDI) typically sources/sinks 8µA
when driven high or low. So from a power dissipation
point of view the duty cycle of the waveform at WDI is
unimportant. When the WDI pin is floating or tri-stated
the power supply current falls to less than 3.0µA.

Glitch Rejection

The AME8510/8520/8530 family will reject negative go­ing transients on the V

DD

line to some extent. The smaller
the duration of the transient the larger its amplitude may
be without triggering a reset. The “Glitch Rejection” chart
in the graphs section of this datasheet shows the rela­tion between glitch amplitude and allowable glitch dura­tion to avoid unintended resets.

Accurate Output State at Low V

DD

With VDD voltage on the order of the MOS transistor thresh­old (<1.0V) the outputs of the AME8510/8520/8530 may
become undefined. For parts with active low output
(RESETB) a resistor placed between RESETB and GND
on the order of 100kΩ will ensure that the RESETB out­put stays low when VDD is lower than the threshold volt­age of the part. In a like manner a resistor on the order of
100kΩ when placed between RESET and VDD will en­sure parts with active high output (RESET) will remain
high when VDD is lower than the threshold voltage of the
part.

AME, Inc.

8

AME8510 / 8520 / 8530

Micropower

µµ

µµ

µP Watch Dog T imer

0

20

40

60

80

100

120

140

0.01 0.1 1

Glitch Rejection

Glitch Duration (

µ

µµ

µ

S)

Glitch Amplitude (V)

190

195

200

205

210

215

220

-45 -5 25 55 85 115

Temp erat ure (0C)

Reset Time (mS)

Reset time vs Temperature

Vth=2.63V

2.10

2.15

2.20

2.25

2.30

2.35

-45 - 5 25 55 85 115

Temperature (0C)

Supply Current @ 5V (uA

)

IDD vs Temperature

Vth=2.63V

2.630

2.632

2.634

2.636

2.638

2.640

2.642

2.644

2.646

2.648

2.650

-45-5255585115

Temperature (0C)

Reset Vth (V)

Reset Vth vs Temperature

Vth=2.63V

0.220

0.225

0.230

0.235

0.240

0.245

0.250

0.255

0.260

0.265

-45 -5 25 55 85 115

Temperature (0C)

Reset VOL @ 0.8mA (V)

RESETB VOL vs Temperature

Vth=2.63V

AME, Inc.

9

AME8510 / 8520 / 8530

Micropower

µµ

µµ

µP Watch Dog Timer

SOT-25

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n Package Dimension

MIN MAX MIN MAX

A 1.00 1.4 5 0.039 4 0.057 1

A

1

0.00 0.15 0.0000 0.0591

A2 0.70 1.25 0.0276 0.0492

b 0.3 5 0.5 5 0.0 13 8 0.021 7
C 0.08 0.2 5 0.0 03 1 0.0 0 9 8
D 2 .7 0 3.1 0 0.1 0 6 3 0.1 2 2 0
E 1 .4 0 1.8 0 0.0 5 5 1 0.0 70 9
e
H 2.60 3.0 0 0.1 02 4 0.118 1
L 0.30 - 0.0118 -

θ1

θ1θ1

θ1

0

°

10

°

0

°

10

°

S

1

0.85 1.05 0.0335 0.0413

1.90 BSC 0.07480 BSC

SY M BO L S

MILLIMETERS INCHES

Life Support Policy:

These products of AME, Inc. are not authorized for use as critical components in life-support devices or

systems, without the express written approval of the president

of AME, Inc.

AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and

advises its customers to obtain the latest version of relevant information.

 AME, Inc., January 2002

Document: 2007-DS8510/8520/8530-B

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