Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!husc6!cca!mirror!datacube!dje
From: dje@datacube.UUCP
Newsgroups: sci.electronics
Subject: Re: TTL Questions
Message-ID: <100500018@datacube>
Date: Thu, 13-Aug-87 17:24:00 EDT
Article-I.D.: datacube.100500018
Posted: Thu Aug 13 17:24:00 1987
Date-Received: Sun, 16-Aug-87 06:23:15 EDT
References: <1395@crash.CTS.COM>
Lines: 17
Nf-ID: #R:crash.CTS.COM:-139500:datacube:100500018:000:651
Nf-From: datacube.UUCP!dje    Aug 13 17:24:00 1987



In 1976 H.P.  Waltham started using 74LS TTL.   We  recieved a waiver
on the input voltage specs of all LS TTL from T.I.  (our  only LS TTL
supplier at the time)  to apply  up to  +15 Volts  to LS  inputs.  We
needed  this  so  we  could  easily  interface  to  the  HP  designed
state-of-the-art +12V SOS CMOS 16 bit processor (the MCC). So I guess
higher voltages Into  LS is (or was) OK.

 				Dave Erickson
----------------------------------------------
  ------      Datacube Inc. 
 /    /|      4 Dearborn Rd. 
------ |      Peabody, Ma 01960
||  \| |      ihnp4!datacube!dje
||  /|/       Human:(617)535-6644
------        Fax:  (617)535-5643