AME
µProcessor Supervisory
AME8570M
n General Description
The AME8570M 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.
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 immediately ( 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 only when supply voltage is greater than
1V.
n Functional Block Diagram
AME8570M Push-Pull RESET/ RESETB
IN
R1
P1
I1
RESET/
RESETB
Delay
R2
V REF
N1
GND
AME8570M Open-Drain RESET/RESETB
IN
R1
I1
RESET/
RESETB
Delay
The AME8570M also provide a reset manually by pulling the MRB input to ground.
R2
VREF
N1
Space saving SC-70 package and micropower quiescent current (<3.0µA ) make this family a natural for portable battery powered equipment.
n Features
l Small Packages : SC-70-4, SOT-23,
AME8570M Push-Pull RESET/ RESETB with MRB
MRB
IN
TSOT-23A, SOT-25, TSOT-25A, SOT-143
R1
l Tight Voltage Threshold Tolerance:± 1.50%
I1
l Wide Temperature Range : -40OC to +85OC
RESET/
RESETB
Delay
l Low Quiescent Current <3.0µA
R2
l Manual Reset Input Option
l Green Products Meet RoHS Standards
P1
VREF
N1
GND
AME8570M Open-Drain RESET/RESETB with MRB
n Applications
l Portable Electronics
MRB
IN
l Power Supplies
R1
I1
l Computer Peripherals
l Data Acquisition Systems
l Applications using CPUs
l Consumer Electronics
Rev. A.10
RESET /
RESETB
Delay
R2
VREF
N1
GND
1
