Chris, you may want to read up on Latch up. CMOS has ( had ) this problem. The parts I've seen have the ouput stage shorted.
The web sites of National, etc have app notes that talk about this. If you get stuck, e-mail me and I'll hunt some out for you. Best regards, Derek. --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.com with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, ri...@sdd.hp.com, or roger.volgst...@compaq.co (the list administrators).