AME
AME8570
mProcessor Supervisory
n General Description
n Functional Block Diagram
AME8570 Push-Pull RESET/ RESETB
The AME8570 family allows the user to customize the
CPU reset function without any external components.
The user has serveral choice of reset voltage thresholds,
reset time intervals, and output driver configurations, all
of which are preset at the factory.
VIN
R1
R2
P1
N1
I1
RESET/
RESETB
Delay
These circuits monitor the power supply voltage of mP
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
VREF
GND
for a time interval, T . The reset output may be either
D2
AME8570 Open-Drain RESETB
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 only when supply voltage is greater than
1V.
V
IN
I1
R1
R2
RESET/
RESETB
Delay
The AME8570 also provide a reset manually by pulling
the MRB input to ground.
VREF
N1
GND
Space saving SC-70 package and micropower quies-
cent current ( < 3.0mA ) make this family a natural for
portable battery powered equipment.
AME8570 Push-Pull RESET/ RESETB with MRB
n Features
MRB
VIN
l Small Packages : SC-70, SOT-23, SOT-143
l Tight Voltage Threshold Tolerance :
± 1.50%
R1
R2
I1
P1
N1
l Wide Temperature Range : -40OC to +85OC
l Low Quiescent Current < 3.0 mA
l Manual Reset Input Option
RESET/
RESETB
Delay
VREF
GND
l Green Products Meet RoHS Standards
AME8570 Open-Drain RESETB with MRB
MRB
n Applications
VIN
l Portable Electronics
l Power Supplies
R1
R2
I1
RESET/
RESETB
Delay
l Computer Peripherals
l Data Acquisition Systems
l Applications using CPUs
l Consumer Electronics
VREF
N1
GND
Rev.C.02
1