Analog Microelectronics, Inc.
1
AME8500 / 8501
Micropower
µµµµµ
P Reset Family
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Features
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Small packages: SOT-23, SOT-89
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11 voltage threshold options
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Tight voltage threshold tolerance ---
±
1.50%
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4 reset interval options
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4 output configuration options
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Wide temperature range -------- -40
o
C to 85
o
C
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Low temperature coefficient --- 100ppm/
o
C (max)
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Low quiescent current < 3.0
µ
A
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Thermal shutdown option (AME8501)
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General Description
The AME8500 family allows the user to customize the
CPU reset function without any external components.
The user has a large choice of reset voltage thresh-
olds, reset time intervals, and output driver configura-
tions, all of which are preset at the factory. Each
wafer is trimmed to the customer's specifications.
These circuits monitor the power supply voltage of
µ
P
based systems. When the power supply voltage drops
below the voltage threshold a reset is asserted immedi-
ately (within an interval T
D1
). The reset remains asserted
after the supply voltage rises above the voltage threshold
for a time interval, T
D2
. The reset output may be either
active high (RESET) or active low (RESETB). The reset
output may be configured as either push/pull or open
drain. The state of the reset output is guaranteed to be
correct for supply voltages greater than 1V.
The AME8501 includes all the above functionality plus
an overtemperature shutdown function. When the ambi-
ent temperature exceeds 80
0
C a reset is asserted and
remains asserted until the temperature falls below 60
0
C.
Space saving SOT23 packages and micropower quies-
cent current (<3.0
µ
A) make this family a natural for por-
table battery powered equipment.
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Applications
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Portable electronics
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Power supplies
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Computer peripherals
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Data acquisition systems
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Applications using CPUs
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Consumer electronics
Analog Microelectronics, Inc.
2
AME8500 / 8501
Micropower
µµµµµ
P Reset Family
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Pin Configuration
AME8500AEET
AME8501AEET
1: GND
2: Reset/ResetB
3: V
DD
3
1
2
AME8500BEET
AME8501BEET
1: Reset/ResetB
2: GND
3: V
DD
3
1
2
AME8500AEFT
AME8501AEFT
1: GND
2: V
DD
3: Reset/ResetB
3
2
1
AME8500BEFT
AME8501BEFT
1: Reset/ResetB
2: V
DD
3: GND
3
2
1
3
1
2
AME8500CEET
AME8501CEET
1: Reset/ResetB
2: V
DD
3: GND
3
2
1
1: V
DD
2: GND
3: Reset/ResetB
AME8500CEFT
AME8501CEFT
Analog Microelectronics, Inc.
3
AME8500 / 8501
Micropower
µµµµµ
P Reset Family
Note: AME8500 without over-temperature thermal shutdown function.
AME8501 with over-temperature thermal shutdown function.
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Ordering Information
AME8500xEET X X XX
( SOT-23)
AME8501xEET X X XX
( SOT-23)
AME8500xEFT X X XX
( SOT-89)
AME8501xEFT X X XX
( SOT-89)
VDD Threshold Voltage (V
TH
)
21: V
TH
=2.1V
24: V
TH
=2.4V
26: V
TH
=2.63V
27: V
TH
=2.7V
28: V
TH
=2.8V
29: V
TH
=2.93V
31: V
TH
=3.08V
40: V
TH
=4.0V
42: V
TH
=4.20V
44: V
TH
=4.38V
46: V
TH
=4.63V
note: Please contact AME sales dept. for other voltage options.
Reset Time (TD
2NOM
)
A:
T
D
=1.5mS
D:
T
D
=30mS
E:
T
D
=150mS
F:
T
D
=210mS
Output Driver Option
--For example--
*
AME8500AEETAF27 means:
A:
PP
Output is RESETB, push pull
B:
OD
* Output Driver Chart Explanation:
Reset time is 210mS
C:
PP
PP = Push pull output
V
DD
threshold voltage is 2.7V
D:
OD
OD = Open drain output
No temperature shutdow n
Polarity
RESET = Active high
RESETB
RESET
RESET
characteristic of
RESET or RESETB pin
Polarity
RESETB
Analog Microelectronics, Inc.
4
AME8500 / 8501
Micropower
µµµµµ
P Reset Family
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Absolute Maximum Ratings
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Recommended Operating Conditions
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Thermal Information
Caution: Stress above the listed absolute rating may cause permanent damage to the device
Ambient Temperature Range
Junction Temperature
Supply Voltage
Parameter
-40 to +85
o
C
-40 to +125
o
C
Storage Temperature
-65 to 150
O
C
Rating
1.6 - 5 V
Maximum
Unit
7
V
B
20
mA
20
mA
100
V/
µ
s
Parameter
Supply Voltage
ESD Classification
Rate of Rise, V
DD
Output Current, RESET, ResetB
Input Current, V
DD
Maximum
Unit
325
180
350
650
150
o
C
300
o
C
Parameter
Maximum Lead Temperature ( 10 Sec)
Maximum Junction Temperature
o
C
/
W
mW
Thermal Resistance (SOT-89)
Power Dissipation (SOT-23)
Power Dissipation (SOT-89)
Thermal Resistance (SOT-23)
Analog Microelectronics, Inc.
5
AME8500 / 8501
Micropower
µµµµµ
P Reset Family
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Electrical Specifications
T
A
=
25
o
C unless otherwise noted
PARAMETER
SYMBOL
MIN TYP
MAX
UNITS
1
5.5
1
5.5
3.0
µ
A
5.0
V
THNOM
-
1.5%
V
THNOM
+
1.5%
V
THNOM
-
2.0%
V
THNOM
+
2.0%
Hysteresis Range
V
HYST
20
mV
RESET Threshold Tempco
30
ppm
RESETB Output Voltage Low
V
DD
<Vth min
RESET Output Voltage Low
V
DD
>Vth max
RESETB Output Voltage High
V
DD
>Vth max
RESET Output Voltage High
V
DD
<Vth min
V
DD
to Reset Delay
T
D1
40
200
µ
S
Version A
0.5
1.5
5
mS
Version D
15
30
50
mS
Version E
80
150
230
mS
Version F
140
210
500
mS
Temperature Shutdown
T
OFF
80
o
C
Temperature Shutdown Hysteresis
T
HYS
20
o
C
Note1: The data based on V
TH
=2.7V part type.
0.8V
DD
V
0.5
V
mV
V
TH
V
RANGE
V
I
DD
V
DD
= V
TH
- 100mV, TA= -40 ~ 85
O
C
V
DD
Range*
Supply Current
Reset Threshold
V
OL
V
OH
I
SINK
=1.2mA,
TA= -40~85
O
C
I
SOURCE
=0.5mA,
TA= -40~85
O
C
V
Release
- V
TH
, note1
TEST CONDITIONS
TA=-40~85
O
C
V
DD
=
3.0V
V
DD
=
3.0V, TA=-40~85
O
C
TA=-40~85
O
C
Reset Timeout Period*
T
D2
TA= -40 ~ 85
O
C
AME8501 only
AME8501 only
Analog Microelectronics, Inc.
6
AME8500 / 8501
Micropower
µµµµµ
P Reset Family
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AME8500/01 pin description
V
DD
GND
Positive power supply. A reset is asserted
after this voltage drops below a
predetermined level. After V
DD
rises above
that level the reset output remains asserted
until the end of the reset timeout period.
Ground
Description
Name
RESETB/
RESET
This pin can be ordered as RESET or
RESETB. RESET is active high. RESETB
is active low. It is also available with an
open drain or pushpull output.
Analog Microelectronics, Inc.
7
AME8500 / 8501
Micropower
µµµµµ
P Reset Family
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Timing Diagram
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Applications information
These devices have a certain immunity to fast
negative going transients. In the following pages
the graph titled “Glitch Rejection” indicates the
maximum allowable glitch amplitude and dura-
tion to avoid triggering an unintended reset. As
shown in the graph shorter transients can have
larger amplitudes without triggering resets.
Supply Transients
0
20
40
60
80
100
120
140
0.01
0.1
1
Glitch Rejection
Glitch Duration (
µµµµ
S)
Glitch Amplitude (V)
V
D D
T
D 2
V
T H
RESETB
V
T H
T
D 1
T
D 2
T
D 1
RESET
5 0 %
5 0 %
5 0 %
5 0 %
Analog Microelectronics, Inc.
8
AME8500 / 8501
Micropower
µµµµµ
P Reset Family
0
0.4
0.8
1.2
1.6
2
0
1
2
3
4
5
I
D D
vs. V
D D
I
DD
(
µµµµ
A)
V
D D
(V)
8 5
O
C
-40
O
C
0
O
C
37
38
39
40
41
42
43
-40
-20
0
20
40
60
80
100
TD1 Delay vs. Temperature
TD2 Delay (
µµµµ
S)
Temperature (
O
C)
0
0.1
0.2
0.3
0.4
0.5
-40
-20
0
20
40
60
80
100
Threshold Hysteresis vs.
Temperature
Hysteresis (% of V
TH
)
Temperature (
O
C)
190
195
200
205
210
215
220
-45
-5
25
55
85
115
Te m pe ra ture (
0
C)
Reset Time (mS)
Reset Time vs. Temperature
A M E 8 5 0 0 A E E T A F 2 6
2.630
2.632
2.634
2.636
2.638
2.640
2.642
2.644
2.646
2.648
2.650
-45
-5
25
55
85
115
Temperature (
0
C)
Reset Vth (V)
Reset Vth vs. Temperature
A M E 8 5 0 0 A E E T A F 2 6
2.10
2.15
2.20
2.25
2.30
2.35
-45
-5
25
55
85
115
Temperature (
0
C)
Supply Current @ 5V (uA)
I
D D
vs. Temperatrue
A M E 8 5 0 0 A E E T A F 2 6
Analog Microelectronics, Inc.
9
AME8500 / 8501
Micropower
µµµµµ
P Reset Family
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 (
0
C)
Reset VOL @ 0.8mA (V)
Reset VOL vs. Temperature
A M E 8 5 0 0 A E E T A F 2 6
Analog Microelectronics, Inc.
10
AME8500 / 8501
Micropower
µµµµµ
P Reset Family
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Package Dimension
SOT-23
SOT-89
MIN
MAX
MIN
MAX
A
1.40
1.60
0.0551
0.0630
A
1
0.89
-
0.0350
-
b
0.36
0.52
0.0142
0.0205
b
1
0.41
0.56
0.0161
0.0220
C
0.35
0.44
0.0138
0.0173
D
4.40
4.60
0.1732
0.1811
D
1
1.35
1.83
0.0531
0.0720
HE
-
4.25
-
0.1673
E
2.29
2.60
0.0902
0.1024
e
2.90
3.10
0.1142
0.1220
H
0.35
0.70
0.0138
0.0276
S1
1.40
1.60
0.0551
0.0630
SYMBOLS
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
A
1.00
1.40
0.0394
0.0551
A
1
0.00
0.15
0.0000
0.0059
A
2
0.70
1.25
0.0276
0.0492
b
0.35
0.50
0.0138
0.0197
C
0.09
0.25
0.0035
0.0098
D
2.70
3.10
0.1063
0.1220
E
1.40
1.80
0.0551
0.0709
e
H
2.60
3.00
0.1024
0.1181
L
0.35
0.55
0.0138
0.0197
θ1
θ1
θ1
θ1
0
o
9
o
0
o
9
o
1.90 BSC
0.0748 BSC
SYMBOLS
MILLIMETERS
INCHES
Life Support Policy:
These products of Analog Microelectronics, Inc. are not authorized for use as critical components in life-
support devices or systems, without the express written approval of the president
of Analog Microelectronics, Inc.
Analog Microelectronics, 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.
©
Analog Microelectronics, Inc. , December 2001
Document: 2007-DS8500/8501-F
Corporate Headquarters
Asia Pacific Headquarters
Analog Microelectronics, Inc.
AME, Inc.
3100 De La Cruz Blvd. Suite 201
2F, No. 187 Kang-Chien Road, Nei-Hu District
Santa Clara, CA. 95054-2046
Taipei 114, Taiwan, R.O.C.
Tel : (408) 988-2388
Tel : 886 2 2627-8687
Fax: (408) 988-2489
Fax : 886 2 2659-2989
www.analogmicro.com
E-Mail: info@analogmicro.com