SE811 Datasheet, PDF (5/8 Pages) Seaward Electronics Inc. – 4-Pin Microprocessor Reset Monitor

4-Pin Microprocessor Reset Monitor
(Preliminary)
Application Hints
General Description
SE811 is the extension of SE809 family. It provide
the same basic function as SE809, plus the
additional MR function. The detailed operation of
MR function is described below.
SE811
Manual Reset Input
Many μP-based products require manual reset
capability, allowing the operator, a test technician, or
external logic circuitry to initiate a reset. A logic low
on MR will trigger the reset process. Reset remains
asserted as long as MR is low and for 150ms after
MR returns high. Leave open if unused. Connect a
normally open momentary switch from MR to GND
to create a manualreset function; external debounce
circuitry is not required. If MR is driven from long
cables or if the device is used in a noisy
environment, connecting a 0.1μF capacitor from MR
to ground provides additional noise immunity. It is
important that the MR pin is not connected to Vcc in
applications.
Revision 5/15/2009
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2007. • www.seawardinc.com
5