I have a small supply of these devices I salvaged from an old inventory of parts from General Electric. I haven't been able to get any information either. I believe they were used in nuclear reactor control circuits due to its high operating voltages which made them highly inmune to noise. I think its fabrication technology was called MHTL.
Tony
-----Original Message-----
From: Uwe Zimmermann <[EMAIL PROTECTED]>
To: Multiple recipients of list CHIPDIR-L <[email protected]>
Sent: Thu, 11 Aug 2005 01:59:22 -0800
Subject: old logic
Does anyone of you have a clue (i.e. timing, supply voltage limits, complete pinout) about the following chips: MC 660 L 4-NAND MC 671 L tripple 3-NAND MC 672 L quad 2-NAND MC 680 L hex INVERTER These are in a piece of control electronics dating back to 1972-76. They seem to be straight-forward logic chips running from a 15V supply (CMOS? hardly I believe...). I am looking for possible drop-in replacements, otherwise I would have to re-do the whole thing with its 30+ chips on three PCBs in a more modern technology... I don't even know where to start to look for the malfunction... Uwe.
