Re: NMOS/TTL driving CMOS?

Article View: sci.electronics

Article #21690

#21690

From: Bulent Abali
Date: Thu, 08 Jun 1989 16:47

16 lines
1172 bytes

In article <811@tekno.chalmers.se> foperator@tekno.chalmers.se (Daniel Berglund) writes:
>Is it possible for an NMOS device (in this case, a 68000) to utilize CMOS
>(74HCxx) interface circuits? The data sheets say that Voh from the 68000 is 
>_at least_ 2.4 V (and at most Vcc), but an HC device wants at least 3.15 V to be
>happy (@Vcc=5V). 

Connect a pullup resistor between 68000 output and Vcc.
Resistor must be large enough so that I_OL current rating 
of 68000 output is not exceeded (1K-4.7K may do it).
 

-=-
Bulent Abali
Ohio State Univ., Dept.of Electrical Eng.
2015 Neil Av. Columbus, Ohio 43210
abali@baloo.eng.ohio-state.edu

Technical Details

Message-ID: <2372@quanta.eng.ohio-state.edu>

Path:

arc1-ca.pugleaf.net!utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!quanta.eng.ohio-state.edu!parts.eng.ohio-state.edu!abali

References: <811@tekno.chalmers.se>

Show Full Headers

Complete Article Headers

Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!quanta.eng.ohio-state.edu!parts.eng.ohio-state.edu!abali
From: abali@parts.eng.ohio-state.edu (Bulent Abali)
Newsgroups: sci.electronics
Subject: Re: NMOS/TTL driving CMOS?
Message-ID: <2372@quanta.eng.ohio-state.edu>
Date: 8 Jun 89 16:47:00 GMT
References: <811@tekno.chalmers.se>
Sender: news@quanta.eng.ohio-state.edu
Reply-To: abali@parts.eng.ohio-state.edu (Bulent Abali)
Organization: Ohio State Univ, College of Engineering
Lines: 16

Reply to Parent Message