[Heath] Information on 7492N (heath 443-34) binary counter please?

[ChrisIwata at aol.com]

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.)
 
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. 
 
Many counters can't count down to 50Khz without a pre-scaler (which  
actually multiples the frequency). 
 
Chris, KL7DM   
 
 
 
In a message dated 2/22/2011 7:32:46 A.M. Pacific Standard Time,  
dsnaib at gmail.com writes:

 
Does anyone have a datasheet for the 7492N?    
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 ? 
Thanks, 
Dean Naib 



_______________________________________________
Heath  mailing  list
Heath at puck.nether.net
https://puck.nether.net/mailman/listinfo/heath

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/heath/attachments/20110222/17a05401/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 7492N.pdf
Type: application/pdf
Size: 79038 bytes
Desc: not available
URL: <https://puck.nether.net/pipermail/heath/attachments/20110222/17a05401/attachment-0001.pdf>