1
AME8500 / 8501
μProcessor Supervisory
l Small packages: SOT-23, SOT-89l 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 -------- -40o C to 85o C l Low temperature coefficient --- 100ppm/o C (max)l Low quiescent current < 3.0μA l Thermal shutdown option (AME8501)
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 80o C a reset is asserted and remains asserted until the temperature falls below 60o C.Space saving SOT23 packages and micropower qui-escent current (<3.0μA) make this family a natural for portable battery powered equipment.
n General Description
n Features
n Typical Operating Circuit
Note: * External pull-up resistor is required if open-drain output is used. 10 k ? is recommended.
n Block Diagram
l Portable electronics l Power supplies
l Computer peripherals l Data acquisition systems l Applications using CPUs l Consumer electronics
n Applications
AME8500 with Push-Pull RESET
V
V DD
RESET
AME8500 with Push-Pull RESET
2
μProcessor Supervisory
AME8500 / 8501
n Block Diagram (contd.)
AME8500AEET AME8501AEET 1.GND
2.Reset/ResetB
3.V DD
SOT-23Top View
123
n Pin Configuration
SOT-23Top View
12
3
SOT-23Top View
AME8500CEET AME8501CEET 1.Reset/ResetB 2.V DD 3.GND
123
AME8500BEET AME8501BEET 1.Reset/ResetB 2.GND 3.V DD
AME8500 with Open-Drain RESET
V AME8500 with Open-Drain RESET
V DD
AME8500AEET AME8501AEET 1.GND
2.Reset/ResetB
3.V DD
SOT-23-L Top View
12
3
3
AME8500 / 8501
μProcessor Supervisory
n Pin Configuration (contd.)
SOT-89Top View
SOT-89Top View
SOT-89Top View
AME8500AEFT AME8501AEFT 1.GND 2.V DD
3.Reset/ResetB
AME8500CEFT AME8501CEFT 1.V DD 2.GND
3.Reset/ResetB
AME8500BEFT AME8501BEFT 1.Reset/ResetB 2.V DD 3.GND
132
13
2
13
2
SOT-23-L Top View
AME8500BEET AME8501BEET 1.Reset/ResetB 2.GND 3.
V DD
123
SOT-23-L Top View
AME8500CEET AME8501CEET 1.Reset/ResetB 2.V
DD 3.GND
12
3
SOT-25Top View
AME8500BEEV AME8501BEEV 1.Reset/ResetB 2.V DD 3.GND 4.N/C 5.
N/C
13
25
4
4
μProcessor Supervisory
AME8500 / 8501
n Ordering Information
Operating Temperature Range Number of Pins Package Type
Pin Configuration
Special Feature
AME8501 x x x x x x x x
Output Driver Option Reset Time (T D2NOM )VDD Threshold Voltage (V TH )AME8500 x x x x x x x x A
1. GND E:-40O C to 85O C E:SOT-2X T:3A:RESETB /PP A:1.5 ms 15:VTH= 1.5V L:Low profile (SOT-23)
2. Reset/F:SOT-89V:5
B:RESETB /OD D:30 ms 16:VTH= 1.6V Y: ResetB C:RESET/ PP E:150 ms 18:VTH= 1.8V 3. VDD D:RESET/ OD F:210 ms
19:VTH= 1.9V Z:Lead free B
1. Reset/20:VTH=
2.0V (SOT-23)
ResetB 21:VTH= 2.1V 2. GND 22:VTH= 2.2V 3. VDD 23:VTH= 2.32V C
1. Reset/24:VTH=
2.4V (SOT-23)
ResetB 26:VTH= 2.63V 2. VDD 27:VTH= 2.7V 3. GND 28:VTH= 2.8V A
1. GND 29:VTH=
2.93V (SOT-89)
2. VDD 31:VTH=
3.08V 3. Reset/40:VTH=
4.0V ResetB 42:VTH= 4.2V B
1. Reset/44:VTH= 4.38V (SOT-89)
ResetB 46:VTH= 4.63V
2. VDD
3. GND C
1. VDD (SOT-89)
2. GND
3. Reset/ ResetB
Lead free &Low profile Output Driver
Option
Characteristic
of RESET or
RESETB pin
Special Feature
Reset Time (T D2NOM )
VDD Threshold Voltage (V TH )
Package
Type
Number of Pins Operating Temperature
Range
Pin
Configuration (PP = Push pull out)(RESET = Active High)(RESETB = Active Low)(OD = Open drain output polarity )
AME8500 / 8501μProcessor Supervisory n Ordering Information
6μProcessor Supervisory
AME8500 / 8501
n Ordering Information (contd.)
AME8500 / 8501μProcessor Supervisory n Ordering Information (contd.)
Please consult AME sales office or authorized Rep./Distributor for other voltage options.
7
8
μProcessor Supervisory
AME8500 / 8501
n Absolute Maximum Ratings
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
AME8500 / 8501μProcessor Supervisory
9
10μProcessor Supervisory
AME8500 / 8501
n Timing Diagram
n Applications Information
Supply Transients
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 duration to avoid triggering an unintended reset. As shown in the graph shorter transients can have larger amplitudes without triggering resets.
Glitch Rejection Reset Time vs. Temperature
G
l
i
t
c
h
D
u
r
a
t
i
o
n
(
μ
S
)
Glitch Amplitude (V)
20
40
60
80
100
120
140
0.010.11
R
e
s
e
t
T
i
m
e
(
m
S
)
190
195
200
205
210
215
220
-45-5255585115
Temperature (o C)
11
AME8500 / 8501
μProcessor Supervisory
I DD vs. V DD
Threshold Hysteresis vs. Temperature
T D1 Delay vs. Temperature
I DD vs. Temperature
Reset V TH vs. Temperature
Reset VOL vs. Temperature
S u p p l y C u r r e n t @ 5V (u A )
Temperature (o C)2.10
2.15
2.20
2.252.30
2.35
-45
-5
25
55
85
115
2.630
2.632
2.6342.6362.6382.6402.6422.644
2.6462.648
2.650-45
-5
25
55
85
115
R e s e t V t h (V )
Temperature (o
C)
I D D (u A )
V DD (V)
0.4
0.8
1.2
1.6
012345
T
D 2 D e l a y (u S )
Temperature (o C)
3738
39
40
41
42
43-40
-20020406080100
H y s t e r e
s i s (% o f V T H )
Temperature (o C)00.1
0.2
0.3
0.4
0.5
-40
-20020406080100
0.220
0.225
0.2300.2350.2400.2450.2500.2550.260
0.265-45
-5255585115
R
e s e t V O L @ 0.8m A (V )
Temperature (o C)
12
μProcessor Supervisory
AME8500 / 8501
n Package Dimension
SOT-23
c 1
Top View
Side View
SOT-23-L
c 1
Top View
Side View
13
AME8500 / 8501
μProcessor Supervisory
n Package Dimension
SOT-89
Top View Side View
C
SOT-25
Top View
Side View
Front View