AME AME8530AEEVEFX29Z Micropower up watch dog timer Datasheet

AME, Inc.
Micropower µP Watch Dog Timer
AME8510 / 8520 / 8530
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 SOT-25 packages and micropower quiescent current make this family a natural for portable
battery powered equipment.
n Features
l Small packages: SOT-25
n Applications
l
l
l
l
l
Motherboards
Computer peripherals
Portable electronics
Applications using CPUs
Consumer electronics
n Pin Configuration
SOT-25
Top View
5
4
AME8510
1
2
AME8510
1. Reset/ResetB
2. GND
3. MRB
4. WDI
5. V DD
3
SOT-25
Top View
5
4
AME8520
1
2
AME8520
1. Reset/ResetB
2. GND
3. ResetB/Reset
4. WDI
5. VDD
3
l 7 voltage threshold options
SOT-25
Top View
l Tight voltage threshold tolerance ---±1.50%
l 12 output driver configuration options
l Wide temperature range -------- -40oC to 85oC
5
4
l Low temperature coefficient --- 100ppm/o(max)
l Low quiescent current < 3.0µA
AME8530
l 3 bonding options
1
2
AME8530
1. Reset/ResetB
2. GND
3. ResetB/Reset
4. MRB
5. V DD
3
1
AME, Inc.
Micropower µP Watch Dog Timer
AME8510 / 8520 / 8530
n Pin Description
Pin #
Pin Name
Pin Description
This pin may be either RESET or RESETB. RESETB is active
low. In the case of the AME8520 and AME8530 this pin will
always be the opposite polarity from pin 3. This pin can be
push/pull or open drain.
AME8510 AME8520 AME8530
1
1
1
RESET/
RESETB
2
2
2
GND
3
RESET/
RESETB
N/A
3
4
5
2
3
N/A
4
5
4
N/A
5
Ground
This pin may be either RESETB or RESET. RESET is active
high. In the case of the AME8520 and AME8530 this pin will
always be the opposite polarity from pin 1. This pin can be
either push/pull or open drain.
MRB
Manual Reset. Active low. Pulling this pin low forces a reset.
After a low to high transition reset remains asserted for exactly
one reset timeout period. This pin is internally pulled high. If
this function is unused then float this pin or tie it to VDD .
WDI
Watch Dog Input. Any transition on this pin will reset the watch
dog timer. If this pin remains high or low for longer than the
watch dog interval then a reset is asserted. Float or tristate this
pin to disable the watch dog feature.
VDD
Positive power supply. A reset is asserted after this voltage
drops below a predetermined level. After VDD rises above that
level reset remains asserted until the end of the reset timeout
period.
AME, Inc.
Micropower µP Watch Dog Timer
AME8510 / 8520 / 8530
n Ordering Information
AME8510 x x x x x x x x
Special Feature
VDD Threshold Voltage (VTH)
Reset Time (TD2NOM)
Output Driver Option
Number of Pins
Package Type
Operating Temperature Range
Pin Configuration
Pin
Configuration
A: 1. Reset/
ResetB
2. GND
3. MRB
4. WDI
5. VDD
Operating
Temperature
Range
VDD
Package Number Output Driver Reset Time Wach Dog
Threshold
of
Type
Option
(TD2NOM)
Interval
Voltage (V TH )
Pins
E: -40OC to 85OC E: SOT-2X
V: 5
PIN1
F: TD= 210ms E: 1760 ms
A: RESETB/PP
X: without
B: RESETB/OD
WDI
C: RESET/PP
option
D: RESET/OD
E: RESETB/PP
F: RESETB/PP
G: RESETB/OD
H: RESETB/OD
I: RESET/PP
J: RESET/PP
K: RESET/OD
L: RESET/OD
22: VTH=
23: VTH=
26: VTH=
29: VTH=
31: VTH=
44: VTH=
46: VTH=
Special
Feature
2.19V L: Low profile
2.32V Y: Lead free &
2.63V
Low profile
2.93V Z: Lead free
3.08V
4.38V
4.63V
PIN3
E: RESET/PP
F: RESET/OD
G: RESET/PP
H: RESET/OD
I: RESETB/PP
J: RESETB/OD
K: RESETB/PP
L: RESETB/OD
(RESET = Active High)
(RESETB = Active Low)
(PP = Push pull out)
(OD = Open drain output
polarity)
3
AME, Inc.
Micropower µP Watch Dog Timer
AME8510 / 8520 / 8530
n Ordering Information
AME8520 x x x x x x x x
Special Feature
VDD Threshold Voltage (VTH)
Reset Time (TD2NOM)
Output Driver Option
Number of Pins
Package Type
Operating Temperature Range
Pin Configuration
Pin
Configuration
A: 1. Reset/
ResetB
2. GND
3. Reset/
ResetB
4. WDI
5. VDD
Operating
Temperature
Range
Package Number Output Driver Reset Time
of
Type
Option
(TD2NOM)
Pins
E: -40OC to 85OC E: SOT-2X
V: 5
F: TD = 210ms E: 1760 ms
PIN1
A: RESETB/PP
X: without
B: RESETB/OD
WDI
C: RESET/PP
option
D: RESET/OD
E: RESETB/PP
F: RESETB/PP
G: RESETB/OD
H: RESETB/OD
I: RESET/PP
J: RESET/PP
K: RESET/OD
L: RESET/OD
PIN3
E: RESET/PP
F: RESET/OD
G: RESET/PP
H: RESET/OD
I: RESETB/PP
J: RESETB/OD
K: RESETB/PP
L: RESETB/OD
(RESET = Act ive High)
(RESETB = Act ive Low)
(PP = Push pull out )
(OD = Open drain out put
polarit y)
4
Watch
Dog
Interval
VDD
Threshold
Voltage (VTH )
22: VTH=
23: VTH=
26: VTH=
29: VTH=
31: VTH=
44: VTH=
46: VTH=
Special
Feature
2.19V L: Low profile
2.32V Y: Lead free &
2.63V
Low profile
2.93V Z: Lead free
3.08V
4.38V
4.63V
AME, Inc.
Micropower µP Watch Dog Timer
AME8510 / 8520 / 8530
n Ordering Information
AME8530 x x x x x x x x
Special Feature
VDD Threshold Voltage (VTH)
Reset Time (TD2NOM)
Output Driver Option
Number of Pins
Package Type
Operating Temperature Range
Pin Configuration
Pin
Configuration
A: 1. Reset/
ResetB
2. GND
3. Reset/
ResetB
4. MRB
5. VDD
Operating
Temperature
Range
Package
Type
E: -40OC to 85OC E: SOT-2X
Number
Output Driver
of
Option
Pins
V: 5
Reset Time
(TD2NOM)
Watch
Dog
Interval
F: TD= 210ms E: 1760 ms
PIN1
A: RESETB/PP
X: without
B: RESETB/OD
WDI
C: RESET/PP
option
D: RESET/OD
E: RESETB/PP
F: RESETB/PP
G: RESETB/OD
H: RESETB/OD
I: RESET/PP
J: RESET/PP
K: RESET/OD
L: RESET/OD
VDD
Threshold
Voltage (V TH )
22: VTH=
23: VTH=
26: VTH=
29: VTH=
31: VTH=
44: VTH=
46: VTH=
Special
Feature
2.19V L: Low profile
2.32V Y: Lead free &
2.63V
Low profile
2.93V Z: Lead free
3.08V
4.38V
4.63V
PIN3
E: RESET/PP
F: RESET/OD
G: RESET/PP
H: RESET/OD
I: RESETB/PP
J: RESETB/OD
K: RESETB/PP
L: RESETB/OD
(RESET = Act ive High)
(RESETB = Active Low)
(PP = Push pull out )
(OD = Open drain out put
polarit y)
5
AME, Inc.
Micropower µP Watch Dog Timer
AME8510 / 8520 / 8530
n Ordering Information
Part Number
Marking
VTH Voltage
Package
Operating Temp. Range
AME8510AEEVAFE26
ATGww
2.63V
SOT-25
- 40oC to + 85oC
AME8510AEEVAFE29
ATXww
2.93V
SOT-25
- 40oC to + 85oC
AME8510AEEVAFE31
ASMww
3.08V
SOT-25
- 40oC to + 85oC
AME8510AEEVBDD29
ARXww
2.93V
SOT-25
- 40oC to + 85oC
AME8510AEEVEFE31
ATUww
3.08V
SOT-25
- 40oC to + 85oC
AME8520AEEVEFE26
ATCww
2.63V
SOT-25
- 40oC to + 85oC
AME8520AEEVEFE29
ATVww
2.93V
SOT-25
- 40oC to + 85oC
AME8520AEEVEFE31
ATLww
3.08V
SOT-25
- 40oC to + 85oC
AME8520AEEVEFE44
ATWww
4.38V
SOT-25
- 40oC to + 85oC
AME8530AEEVAFX29
AVEww
2.93V
SOT-25
- 40oC to + 85oC
AME8530AEEVAFX31
AVFww
3.08V
SOT-25
- 40oC to + 85oC
AME8530AEEVEFX29
AUSww
2.93V
SOT-25
- 40oC to + 85oC
AME8530AEEVEFX29Z
AUSww
2.93V
SOT-25
- 40oC to + 85oC
AME8530AEEVEFX31
ATNww
3.08V
SOT-25
- 40oC to + 85oC
Please consult AME sales office or authorized Rep./Distributor for other RESET TIME interval and Watch Dog time
interval.
6
AME, Inc.
Micropower µP Watch Dog Timer
AME8510 / 8520 / 8530
n Absolute Maximum Ratings
Parameter
Maximum
Unit
Supply Voltage
6
V
ESD Classification
B
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
n Recommended Operating Conditions
Parameter
Supply Voltage
Rating
Unit
0.9 - 5
V
Ambient Temperature Range
- 40 to + 85
o
Junction Temperature
- 40 to + 125
o
C
C
n Thermal Information
Parameter
Maximum
Unit
o
Thermal Resistance (SOT-25)
256
Maximum Junction Temperature
150
o
C
Maximum Lead Temperature (10 Sec)
300
o
C
C/W
7
AME, Inc.
Micropower µP Watch Dog Timer
AME8510 / 8520 / 8530
n Electrical Specifications
TA = 25OC unless otherwise noted
Parameter
VDD Range
Symbol
Test Condition
V RANGE
Supply Current
IDD
Reset Threshold*
VTH
ResetB Output Voltage
Hgh
VOH
Typ
1
WDI and MRB unconnected
3
VTH
-1.5%
VDD >VTH max
Reset Output Voltage Hgh
VDD <VTH min
ResetB Output Voltage
Low
VDD <VTH min
VOL
Reset Output Voltage Low
Min
VDD >VTH max
VDD to Reset Delay
TD1
VDD = VTH - 100mV
Reset Timeout Period*
TD2
TA= -40~85oC
Watch Dog Timeout
Period*
TWD
WDI Pulse Width
TWDI
ISOURCE=0.5mA,
TA= -40~85oC
Version F
Version E
140
VTH
+1.5%
V
210
280
WDI = 0V
IIH
WDI = VDD = 5.0V
0.8
VDD
-15
mS
mS
nS
0.7
IIL
V
µS
50
V
V
-8
8
15
µA
0.7
V DD = VTH x 1.2
MRBIH
0.8
VDD
TWMRB
1
TDMRB
MRB Pull Up Resistance
* See the chart on page 3 for available values of this parameter.
8
µA
1120 1760 2400
MRB Noise Immunity
(pulse width with no reset)
MRB to Reset Delay
10.0
40
MRBIL
MRB Pulse Width
V
0.5
TA= -40~85oC
V DD = VTH x 1.2
MRB Input Threshold
5.5
V
ISNK=1.2mA,
WDIIH
WDI Input Current
Units
0.8VDD
WDIIL
WDI Input Threshold
Max
80
V
µS
100
nS
500
nS
120
K ohm
AME, Inc.
Micropower µP Watch Dog Timer
AME8510 / 8520 / 8530
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 3 of this data sheet shows all
possible combinations of output driver configuration.
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
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 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.
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.
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.
VTH
VRelease
VTH
VDD
VDD
TD1
RESET
TD2
50%
TD2
50%
TD1
50%
RESETB
TD2
TWD
TD2
50%
WDI
RESETB
Reset Timing Diagram
Watchdog Timing Diagram
9
AME, Inc.
AME8510 / 8520 / 8530
n Detailed Description(contd.)
Watchdog Input Current
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 VDD 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 VDD
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.
10
Micropower µP Watch Dog Timer
AME, Inc.
Micropower µP Watch Dog Timer
AME8510 / 8520 / 8530
Glitch Rejection
Reset Time vs. Temperature
140
220
215
100
Reset Time (mS)
Glitch Duration (µ
µ S)
120
80
60
40
210
Vth=2.63V
205
200
195
20
0
0.01
0.1
190
-45
1
-5
Glitch Amplitude (V)
25
55
85
115
Temperature ( oC)
IDD vs. Temperature
Reset VTH vs. Temperature
2.650
2.35
2.646
2.30
2.644
Reset Vth (V)
Supply Current @ 5V (uA)
2.648
2.25
Vth=2.63V
2.20
2.15
2.642
2.640
2.638
Vth=2.63V
2.636
2.634
2.632
2.10
-45
-5
25
55
85
115
Temperature (oC)
2.630
-45
-5
25
55
85
115
Temperature (oC)
Reset VOL vs. Temperature
0.265
Reset VOL @ 0.8mA (V)
0.260
0.255
0.250
0.245
0.240
0.235
Vth=2.63V
0.230
0.225
0.220
-45
-5
25
55
85
115
Temperature ( oC)
11
AME, Inc.
Micropower µP Watch Dog Timer
AME8510 / 8520 / 8530
n Package Dimension
SOT-25
Top View
Side View
SYMBOLS
D
E
H
L
MIN
£ c
1
S1
A
A1
MAX
0.0472REF
0.15
0.0000
0.0059
b
0.30
0.55
0.0118
0.0217
D
2.70
3.10
0.1063
0.1220
E
1.40
1.80
0.0551
0.0709
e
è1
A
12
MIN
0.00
L
Front View
MAX
1.20REF
INCHES
A1
H
e
b
MILLIMETERS
S1
1.90 BSC
2.60
3.00
0.37BSC
0o
10o
0.95BSC
0.07480 BSC
0.10236 0.11811
0.0146BSC
0o
10o
0.0374BSC
www.ame.com.tw
E-Mail: [email protected]
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. , June 2003
Document: 2007-DS8510/8520/8530-C
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AME, Inc.
Analog Microelectronics, Inc.
2F, 189 Kang-Chien Road, Nei-Hu Dist.
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Santa Clara, CA. 95054-2046
Tel: 886 2 2627-8687
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