[sci.electronics] 8 Bit Counters -- A Summary

totty@flute.cs.uiuc.edu (Brian Totty) (03/09/91)

> Can anyone give me manufacture/part numbers for commonly available
> 8 bit counters.  I have zillions of four bit counters, but a single
> 8 bit IC would be real convenient.  I would prefer an easily available
> part that I could order mail-order from somewhere (know a good place?)
> While we're at it, anyone know of any larger counters available?

	Thanks to everyone who sent me replies.  Let me briefly summarize
	for anyone else who may also be curious the most frequent suggestions:

	(1) Use a dual 4 bit counter with negative clock transition
	    such as the '393 and tie the high bit of the low counter to
	    the clock of the next counter for an 8 bit counter.

	(2) Use a 74HCTLLS590 (listed in Digi-Key catalog as a part made
	    by Samsung), which is an 8 bit counter (but oh so expensive: $4.00)

	(3) Use a CMOS '4040 which is a 12 bit counter, widely available and
	    cheap.  But the pinouts are very irregular.

	So, I am going to get some 4040's.  If anyone knows a wide counter
	with the price of a 4040, but with sane pinouts, let me know!

						Thanks,


						--- Bri

   /                      Brian Totty              o o
  /__  __  o       1304 W. Springfield Avenue       o  
 /  / /   /             Urbana, IL 61801           \_/  "We have corn in
/__/ /   /             totty@cs.uiuc.edu                Massachusetts too!"

whit@milton.u.washington.edu (John Whitmore) (03/09/91)

In article <1991Mar8.205820.5337@m.cs.uiuc.edu> totty@flute.cs.uiuc.edu (Brian Totty) writes:
>> Can anyone give me manufacture/part numbers for commonly available
>> 8 bit counters

>	(3) Use a CMOS '4040 which is a 12 bit counter, widely available and
>	    cheap.  But the pinouts are very irregular.

	There is also a 74HC4040, which has higher speed (and better
output drive characteristics.  $0.80 at DigiKey, with HCT4040 for $1.10.

	John Whitmore