<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML xmlns:o = "urn:schemas-microsoft-com:office:office"><HEAD>
<META content="text/html; charset=UTF-8" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 8.00.6001.19019"></HEAD>
<BODY style="FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" id=role_body
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document
color=#000000 size=2 face=Arial>
<DIV> </DIV>
<DIV>All versions of the 7492 had the same pin-out and logic scheme.
(The 74L93 had a different pin-out than the rest of the versions.)</DIV>
<DIV> </DIV>
<DIV>I found a pin-out for the 7492N on the web, added as an
attachment. Page 1 references the Nat'l Semi DM7492N, page 2 shows the
pin-out for the SN7492N which was made by TI. Both had the same B70 pin-out.
</DIV>
<DIV> </DIV>
<DIV>Many counters can't count down to 50Khz without a pre-scaler (which
actually multiples the frequency). </DIV>
<DIV> </DIV>
<DIV>Chris, KL7DM </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 2/22/2011 7:32:46 A.M. Pacific Standard Time,
dsnaib@gmail.com writes:</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<DIV class=WordSection1>
<P class=MsoNormal>Does anyone have a datasheet for the 7492N?
<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I have found sheets for the 7492AN but the heathkit manual
for the IM-2410 freq counter explains that the reset signal should be
resetting the count to 5 but the 7492AN datasheet says the reset sets it
to 0. My counter has a DM7492AN installed which I don’t think is
correct. The problem I’m having is that I am not able to read any
frequency below around 50 khz regardless of amplitude. The clock pulse
coming out of the DM7492AN doesn’t match the wave form on the schematics,
there should be a notch toward the end of the clock pulse caused by the reset
of 5 but instead I’m seeing a full 0 reset and no notch being taken out of the
clock pulse. I would like to know if the 7492N does have a different
reset then the AN version but I can’t find a datasheet for it. Does
anyone know ?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Thanks,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Dean Naib<o:p></o:p></P>
<P
class=MsoNormal><o:p> </o:p></P></DIV><BR><BR>_______________________________________________<BR>Heath
mailing
list<BR>Heath@puck.nether.net<BR>https://puck.nether.net/mailman/listinfo/heath<BR></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>