AME, Inc.
µProcessor Supervisory
AME8500 / 8501
n General Description
n Typical Operating Circuit
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.
*
2
VCC
VCC
AME8500
Processor
RESET
Input
RESET / RESET
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 TD1). The reset remains asserted
after the supply voltage rises above the voltage threshold
for a time interval, TD2 . 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.
GND
GND
3
Note: * External pull-up resistor is required if open-
drain output is used. 10 kΩ is recommended.
The AME8501 includes all the above functionality plus
an overtemperature shutdown function. When the ambi-
ent temperature exceeds 80oC a reset is asserted and
remains asserted until the temperature falls below 60oC.
n Block Diagram
AME8500 with Push-Pull RESET
Space saving SOT23 packages and micropower qui-
escent current (<3.0µA) make this family a natural for
portable battery powered equipment.
VDD
I1
R1
R2
P1
N1
n Features
l Small packages: SOT-23, SOT-89
Delay
RESET
l 11 voltage threshold options
VREF
l Tight voltage threshold tolerance ---±1.50%
l 5 reset interval options
GND
l 4 output configuration options
l Wide temperature range -------- -40oC to 85oC
l Low temperature coefficient --- 100ppm/oC(max)
l Low quiescent current < 3.0µA
l Thermal shutdown option (AME8501)
AME8500 with Push-Pull RESET
VDD
I1
R1
n Applications
P1
l Portable electronics
RESET
Delay
l Power supplies
R2
VREF
l Computer peripherals
l Data acquisition systems
l Applications using CPUs
l Consumer electronics
N1
GND
1