AME
AME8502
n
General Description
The AME8502 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 customers specicications.
There circuits monitor the power supply voltage of
µP
based system. 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 push-pull. The state of the
reset output is guaranteed to be correct for supply volt-
ages greater than 0.9V.
µ
Processor Supervisory
n
Application
l
l
l
l
Portable Electronics
Power Supplies
Computer Peripherals
Data Acquisition Systems
l
Applicatiions using CPUs
l
Consumer Electronics
n
Typical Application
VIN
RESET /
RESETB
GND
RESET
Input
VIN
Processor
GND
n
Features
l
Internally Fixed Threshold 1.2V to 4.5V in 0.1V
Step
l
High Accuracy
±
1.5%
l
Low Supply Current 3µA
l
No External Components Required
l
Quick Reset within 20µs
l
Built-in Recovery Delay Include 0ms, 55ms,
220ms, 450ms
l
Low Functional Supply Voltage 0.9V
l
Push-Pull Output
l
Small SOT-23, TSOT-23A, SOT-143, SC-70-4,
SOT-25 and TSOT-25A Package
l
RoHS Compliant and Halogen Free
n
Functional Block Diagram
V
IN
R1
I1
Delay
P1
RESET/
RESETB
N1
R2
GND
V
REF
Rev. A.01
1
AME
AME8502
n
Pin Description
Pin No.
SOT-23 /
TSOT-23A
A
1
B
2
C
3
SOT-25 /
SOT-143 SC-70-4
TSOT-25A
1
1
3
µ
Processor Supervisory
Pin Name
Pin Description
GND
RESET/
RESETB
Ground.
This pin can be ordered as RESET or
RESETB. Reset is active high.
RESETB is active low. It is also available
with a push-pull.
Positive power supply. A reset is asserted
after this voltage drops below a
predetermined level. After V
IN
rises above
that level the reset output remains asserted
until the end of the reset timeout periold.
No connection. Not internally connected.
Can left floating or connected to GND.
2
1
1
2
2
1
3
3
2
4
4
2
IN
N/A N/A N/A
3
3
4, 5
NC
Rev. A.01
3
AME
AME8502
n
Absolute Maximum Ratings
Parameter
Supply Voltage
Input Current, V
IN
Output Current, RESET, RESETB
ESD Classification
HBM
MM
µ
Processor Supervisory
Maximum
6
20
20
2
200
Unit
V
mA
mA
kV
V
n
Recommended Operating Conditions
Parameter
Junction Temperature Range
Ambient Temperature Range
Storage Temperature Range
Symbol
T
J
T
A
T
STG
Rating
-40 to +125
-40 to +85
-65 to +150
Unit
o
C
Rev. A.01
5
Analogue and Mixed Signal
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