Replacing a 7440 with a 74ls20 - Electronic Circuits Projects Diagrams Free

FastEddie · 19th October 2006, 07:11 PM

Can I substitute a 74ls20 for an obsolete 7440 if I can keep the IOl to 24 mA?
The logic functions are the same except the 7440 has a buffered output. Both have totem pole outputs.

k7elp60 · 21st October 2006, 03:00 AM

My data book lists the IOL as 8mA max for the 74LS20. Hope this helps

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19th October 2006, 07:11 PM	(permalink)
FastEddie	Replacing a 7440 with a 74ls20 Can I substitute a 74ls20 for an obsolete 7440 if I can keep the IOl to 24 mA? The logic functions are the same except the 7440 has a buffered output. Both have totem pole outputs.

21st October 2006, 03:00 AM	(permalink)
k7elp60	My data book lists the IOL as 8mA max for the 74LS20. Hope this helps __________________ The great thing about electronics is unlimited ways to do the job. The only limit is one\'s imagination. I generally think my way is best. Show me a different way. I have an open mind.