AME, Inc.
AME8500 / 8501
µProcessor
Supervisory
n
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 thresholds,
reset time intervals, and output driver configurations, 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
µP
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
o
C a reset is asserted and
remains asserted until the temperature falls below 60
o
C.
Space saving SOT23 packages and micropower quies-
cent current (<3.0µA) make this family a natural for por-
table battery powered equipment.
n
Typical Operating Circuit
2
V
CC
*
V
CC
AME8500
RESET / RESET
GND
Processor
RESET
Input
GND
3
Note: * External pull-up resistor is required if open-
drain output is used. 10 kΩ is recommended.
n
Block Diagram
AME8500 with Push-Pull RESET
V
D D
R1
I1
P1
Delay
n
Features
l
Small packages: SOT-23, SOT-89
l
11 voltage threshold options
l
Tight voltage threshold tolerance ---±1.50%
l
5 reset interval options
l
4 output configuration options
l
Wide temperature range -------- -40
o
C to 85
o
C
l
Low temperature coefficient --- 100ppm/
o
C
(max)
l
Low quiescent current < 3.0µA
l
Thermal shutdown option (AME8501)
V
D D
RESET
N1
R2
GND
V
REF
AME8500 with Push-Pull RESET
n
Applications
l
Portable electronics
l
Power supplies
l
Computer peripherals
l
Data acquisition systems
l
Applications using CPUs
l
Consumer electronics
GND
R1
I1
P1
Delay
RESET
N1
R2
V
REF
1
AME, Inc.
AME8500 / 8501
µProcessor
Supervisory
n
Block Diagram (contd.)
AME8500 with Open-Drain RESET
V
D D
R1
I1
V
D D
R1
Delay
AME8500 with Open-Drain RESET
I1
RESET
N1
GND
R2
V
REF
Delay
RESET
N1
R2
GND
V
REF
n
Pin Configuration
SOT-23
Top View
3
SOT-23
Top View
AME8500AEET
AME8501AEET
1. GND
3
AME8500BEET
AME8501BEET
1. Reset/ResetB
AME8500
2. Reset/ResetB
3. V
DD
AME8500
2. GND
3. V
DD
1
2
1
2
SOT-23
Top View
3
SOT-23-L
Top View
AME8500CEET
AME8501CEET
1. Reset/ResetB
3
AME8500AEET
AME8501AEET
1. GND
AME8500
2. V
DD
3. GND
AME8500
2. Reset/ResetB
3. V
DD
1
2
1
2
2
AME, Inc.
AME8500 / 8501
µ
Processor Supervisory
n
Pin Configuration (contd.)
SOT-23-L
Top View
3
SOT-23-L
Top View
AME8500BEET
AME8501BEET
1. Reset/ResetB
2. GND
3. V
DD
3
AME8500CEET
AME8501CEET
1. Reset/ResetB
2. V
DD
3. GND
AME8500
AME8500
1
2
1
2
SOT-89
Top View
AME8500AEFT
AME8501AEFT
1. GND
2. V
DD
3. Reset/ResetB
SOT-89
Top View
AME8500BEFT
AME8501BEFT
1. Reset/ResetB
2. V
DD
3. GND
AME8500
AME8500
1
2
3
1
2
3
SOT-89
Top View
AME8500CEFT
AME8501CEFT
1. V
DD
2. GND
3. Reset/ResetB
5
SOT-25
Top View
4
AME8500
AME8500
1
2
3
1
2
3
AME8500BEEV
AME8501BEEV
1. Reset/ResetB
2. V
DD
3. GND
4. N/C
5. N/C
n
Pin Description
Pin Name
GND
RESETB/RESET
Ground
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.
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.
3
Pin Description
V
DD
AME, Inc.
AME8500 / 8501
µProcessor
Supervisory
n
Ordering Information
AME8500 x x x x x x x x
AME8501 x x x x x x x x
Special Feature
VDD Threshold Voltage (V
TH
)
Reset Time (T
D2NOM
)
Output Driver Option
Number of Pins
Package Type
Operating Temperature Range
Pin Configuration
Output Driver
Number
Option
Package
of
Characteristic
Type
Pins
of RESET or
RESETB pin
T: 3
V: 5
Pin
Configuration
Operating
Temperature
Range
Reset
Time
(T
D2NOM
)
VDD
Threshold
Voltage (V
TH
)
Special
Feature
A
(SOT-23)
1. GND
E -40
O
C to 85
O
C E SOT-2X
2. Reset/
F SOT-89
ResetB
3. VDD
1. Reset/
ResetB
2. GND
3. VDD
1. Reset/
ResetB
2. VDD
3. GND
1. GND
2. VDD
3. Reset/
ResetB
1. Reset/
ResetB
2. VDD
3. GND
1. VDD
2. GND
3. Reset/
ResetB
1. Reset/
ResetB
2. VDD
3. GND
4. N/C
5. N/C
A: RESETB /PP A: 1.5 ms
B: RESETB /OD D: 30 ms
C: RESET/ PP E: 150 ms
D: RESET/ OD F: 210 ms
(RESET = Active High)
(RESETB = Active Low)
(PP = Push pull out)
(OD = Open drain output
polarity)
B
(SOT-23)
C
(SOT-23)
A
(SOT-89)
15: VTH= 1.5V L: Low profile
16: VTH= 1.6V Y: Lead free &
18: VTH= 1.8V
Low profile
19: VTH= 1.9V Z: Lead free
20: VTH= 2.0V
21: VTH= 2.1V
22: VTH= 2.2V
23: VTH= 2.32V
24: VTH= 2.4V
26: VTH= 2.63V
27: VTH= 2.7V
28: VTH= 2.8V
29: VTH= 2.93V
31: VTH= 3.08V
40: VTH= 4.0V
42: VTH= 4.2V
44: VTH= 4.38V
46: VTH= 4.63V
B
(SOT-89)
C
(SOT-89)
B
(SOT-25)
4
AME, Inc.
AME8500 / 8501
µProcessor
Supervisory
n
Ordering Information (contd.)
Part Number
AME8500AEETAA21
AME8500AEETAA21L
AME8500AEETAA21Z
AME8500AEETAA21Y
AME8500AEETAD20
AME8500AEETAD20L
AME8500AEETAD20Z
AME8500AEETAD20Y
AME8500AEETAD26
AME8500AEETAD26L
AME8500AEETAD26Z
AME8500AEETAD26Y
AME8500AEETAD29
AME8500AEETAD29L
AME8500AEETAD29Z
AME8500AEETAD29Y
AME8500AEETAE20
AME8500AEETAE20L
AME8500AEETAE20Z
AME8500AEETAE20Y
AME8500AEETAE21
AME8500AEETAE21L
AME8500AEETAE21Z
AME8500AEETAE21Y
Marking
ASVww
ASVww
ASVww
ASVww
ALXww
ALXww
ALXww
ALXww
AGWww
AGWww
AGWww
AGWww
ARYww
ARYww
ARYww
ARYww
AUAww
AUAww
AUAww
AUAww
AVGww
AVGww
AVGww
AVGww
V
TH
Voltage
2.10V
2.10V
2.10V
2.10V
2.00V
2.00V
2.00V
2.00V
2.63V
2.63V
2.63V
2.63V
2.93V
2.93V
2.93V
2.93V
2.00V
2.00V
2.00V
2.00V
2.10V
2.10V
2.10V
2.10V
Package
SOT-23
TSOT-23
SOT-23
TSOT-23
SOT-23
TSOT-23
SOT-23
TSOT-23
SOT-23
TSOT-23
SOT-23
TSOT-23
SOT-23
TSOT-23
SOT-23
TSOT-23
SOT-23
TSOT-23
SOT-23
TSOT-23
SOT-23
TSOT-23
SOT-23
TSOT-23
Operating Temp. Range
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
- 40
o
C to + 85
o
C
Note: ww represents the date code
* A line on top of the first letter represents lead free plating such as A SV
Pls consult AME sales office or authorized Rep./Distributor for the availability of output voltage or package type.
5
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