AME8503 Datasheet, PDF (1/17 Pages) Analog Microelectronics – Computer Peripherals

AME
AME8503
n General Description
The AME8503 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 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 open drain. The state of the
reset output is guaranteed to be correct only when sup-
ply voltages is greater than 1V.
The AME8503 also provide a reset manually by pulling
the MRB input to ground. Space saving SC-70 package
and micropower quiescent current (<3.0µA ) make this
family a natural for portable battery powered equipment.
µProcessor Supervisory
n Application
l Portable Electronics
l Power Supplies
l Computer Peripherals
l Data Acquisition Systems
l Applicatiions using CPUs
l Consumer Electronics
n Typical Application
V_IN
PUSH BUTTON RESET / RESETB
SWITCH
MRB
GND
R* _{P ULL-UP}
V_IN
µP
RESET
INPUT
GND
n Features
n Functional Block Diagram
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 N-Channel Open-Drain Output
l Small SOT-143, SC-70-4, SOT-25 and TSOT-
25A Package
l RoHS Compliant and Halogen Free
V_IN
GND
MRB
I2
R1 I1
R2
V _{RE F}
Delay
N1
RESET/
RESETB
Rev. A.01
1