Analog Microelectronics, Inc.
AME8500 / 8501
Micropower
µ
P Reset Family
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 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
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
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 (<3.0µA) make this family a natural for por-
table battery powered equipment.
n
Features
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Small packages: SOT-23, SOT-89
11 voltage threshold options
Tight voltage threshold tolerance ---±1.50%
4 reset interval options
4 output configuration options
Wide temperature range -------- -40
o
C to 85
o
C
Low temperature coefficient --- 100ppm/
o
C (max)
Low quiescent current < 3.0µA
Thermal shutdown option (AME8501)
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Applications
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Portable electronics
Power supplies
Computer peripherals
Data acquisition systems
Applications using CPUs
Consumer electronics
1
Analog Microelectronics, Inc.
AME8500 / 8501
Micropower
µ
P Reset Family
n
Ordering Information
AME8500xEET
AME8501xEET
AME8500xEFT
AME8501xEFT
X
X
X
X
X
X
X
X
XX
XX
XX
XX
( SOT-23)
( SOT-23)
( SOT-89)
( 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:
D:
E:
F:
T
D
=1.5mS
T
D
=30mS
T
D
=150mS
T
D
=210mS
Output Driver Option
characteristic of
RESET or RESETB pin
--For example--
AME8500AEETAF27 means:
Output is RESETB, push pull
Reset time is 210mS
V
DD
threshold voltage is 2.7V
No temperature shutdow n
A:
B:
C:
D:
Polarity
RESETB
RESETB
RESET
RESET
*
PP
OD
PP
OD
* Output Driver Chart Explanation:
PP = Push pull output
OD = Open drain output
Polarity
RESET = Active high
Note: AME8500 without over-temperature thermal shutdown function.
AME8501 with over-temperature thermal shutdown function.
3
Analog Microelectronics, Inc.
AME8500 / 8501
Micropower
µ
P Reset Family
n
Absolute Maximum Ratings
Parameter
Supply Voltage
ESD Classification
Input Current, V
DD
Output Current, RESET, ResetB
Rate of Rise, V
DD
Maximum
7
B
20
20
100
mA
mA
V/
µ
s
Unit
V
n
Recommended Operating Conditions
Parameter
Supply Voltage
Ambient Temperature Range
Junction Temperature
Storage Temperature
Rating
1.6 - 5 V
-40 to +85 C
-40 to +125 C
-65 to 150 C
O
o
o
n
Thermal Information
Parameter
Thermal Resistance (SOT-23)
Thermal Resistance (SOT-89)
Power Dissipation (SOT-23)
Power Dissipation (SOT-89)
Maximum Junction Temperature
Maximum Lead Temperature ( 10 Sec)
Maximum
325
180
350
mW
650
150
300
o
o
Unit
o
C /W
C
C
Caution: Stress above the listed absolute rating may cause permanent damage to the device
4
Analog Microelectronics, Inc.
AME8500 / 8501
Micropower
µ
P Reset Family
n
Electrical Specifications
T
A
= 25
o
C unless otherw noted
ise
PA METER
RA
V
DD
Range*
SYMBOL
V
RANGE
TEST CONDITIONS
MIN
1
TYP
MA
X
5.5
UNITS
V
TA=-40~85 C
V
DD
=3.0V
Supply Current
I
DD
V
DD
=3.0V, TA=-40~85
O
C
O
1
5.5
3.0
5.0
µ
A
V
THNOM
-1.5%
Reset Threshold
V
TH
TA=-40~85 C
Hysteresis Range
RESET Threshold Tempco
RESETB Output Voltage Low
V
OL
RESET Output Voltage Low
RESETB Output Voltage High
V
OH
RESET Output Voltage High
V
DD
to Reset Delay
T
D1
V
DD
<Vth min
V
DD
>Vth max
V
DD
>Vth max
V
DD
<Vth min
I
SINK
=1.2mA,
TA= -40~85
O
C
V
HYST
V
Release
- V
TH
, note1
O
V
THNOM
+1.5%
mV
V
THNOM
+2.0%
20
30
mV
ppm
V
THNOM
-2.0%
0.5
V
I
SOURCE
=0.5mA,
TA= -40~85
O
C
0.8V
DD
V
V
DD
= V
TH
- 100mV, TA= -40 ~ 85
O
C
Version A
Version D
0.5
15
80
140
40
1.5
30
150
210
80
20
200
5
50
230
500
µ
S
mS
mS
mS
mS
o
Reset Timeout Period*
T
D2
TA= -40 ~ 85 C
Version E
Version F
O
Temperature Shutdown
Temperature Shutdown Hysteresis
T
OFF
T
HYS
AME8501 only
AME8501 only
C
C
o
Note1: The data based on V
TH
=2.7V part type.
5
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