Maker Pro
Maker Pro

do comparators go out-of-control at startup?

i am using an LMC6772A and I need to make sure that the output does
not go out-of-control during startup and go LOW for any length of
time, i.e. while the supply voltage is less than 2.7V, the output
needs to stay high (open drain). the inputs will always be + > -
during startup.

is there some way to figure out if this comparator is intrinsically
designed to be open-drain during startup?
 
M

Meat Plow

Jan 1, 1970
0
i am using an LMC6772A and I need to make sure that the output does
not go out-of-control during startup and go LOW for any length of
time, i.e. while the supply voltage is less than 2.7V, the output
needs to stay high (open drain). the inputs will always be + > -
during startup.

is there some way to figure out if this comparator is intrinsically
designed to be open-drain during startup?


Spec/Data Sheet?
--
#1 Offishul Ruiner of Usenet, March 2007
#1 Usenet Asshole, March 2007
#1 Bartlo Pset, March 13-24 2007
#10 Most hated Usenetizen of all time
Pierre Salinger Memorial Hook, Line & Sinker, June 2004
COOSN-266-06-25794
 
J

Joerg

Jan 1, 1970
0
i am using an LMC6772A and I need to make sure that the output does
not go out-of-control during startup and go LOW for any length of
time, i.e. while the supply voltage is less than 2.7V, the output
needs to stay high (open drain). the inputs will always be + > -
during startup.

is there some way to figure out if this comparator is intrinsically
designed to be open-drain during startup?

If you have a very good SPICE file from the manufacturer you might be
able to figure it out. However, if something can seriously break in case
it doesn't comply I would do this with discretes. If your BOM budget
allows (mine usually doesn't...) you could even use a fancy reset chip
for uC, a pnp, some resistors etc.
 
Top