3-Pin Microprocessor Reset Monitor
(Preliminary)
Description
The
SE809
is
a
cost-effective
system
supervisor Integrated Circuit (IC) designed to
monitor V
CC
in digital and mixed signal systems and
provide a warning signal when the system power
supply is out of working range, and a reset signal to
the host processor when necessary. No external
components are required.
The reset output is driven active within 20μsec
of V
CC
falling through the reset voltage threshold.
Reset is maintained active after V
CC
rises above the
reset threshold. The SE809 has an active-low
RESET output. The output of the SE809 is
guaranteed valid down to V
CC
=1V.
The SE809 is optimized to reject fast transient
glitches on the V
CC
line. Low supply current of 18μA
(V
CC
=3.3V) makes these devices suitable for battery
powered applications. The output voltages range
from 1.7V to 4.5V in 100mV increments. Standard
voltage versions are 2.30, 2.63, 2.93, 3.08, 4.0,
4.38, and 4.63V.
Computers
Embedded systems
Battery powered equipment
SE809
Features
Precision V
CC
Monitor for 2.8V, 3.0V, 3.3V, and
5.0V Supplies
200mSec typical RESET Output Delay.
RESET Output Guaranteed to V
CC
=1.0V
Low 7μA Supply Current typical.
V
CC
Transient Immunity
Small SOT-23 Package and TO-92 Package
No External Components
Wide Operating Temperature: 0°C to 85°C
100% Lead (Pb)-Free
Application
Critical µP power supply monitoring
Pin Configuration
Application Diagram
Revision 1/7/2008
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2007. • www.seawardinc.com
1
SEAWARD [ Seaward Electronics Inc. ]
