Return-Path: Received: (qmail 14576 invoked from network); 23 Nov 2001 12:42:31 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 23 Nov 2001 12:42:31 -0000 Content-Transfer-Encoding: 8bit Received: (qmail 7869 invoked from network); 23 Nov 2001 12:42:24 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 23 Nov 2001 12:42:24 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 167Fcd-0008KJ-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 23 Nov 2001 12:39:59 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 167Fcb-0008KE-00 for rsgb_lf_group@blacksheep.org; Fri, 23 Nov 2001 12:39:58 +0000 Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id MAA05391; Fri, 23 Nov 2001 12:47:44 GMT Received: (qmail 6280 invoked from network); 23 Nov 2001 13:30:18 -0000 Received: from gauntlet.mail.dstl.gov.uk (192.168.9.10) by baton.dstl.gov.uk with SMTP; 23 Nov 2001 13:30:18 -0000 Received: by gauntlet.mail.dstl.gov.uk; id NAA20426; Fri, 23 Nov 2001 13:04:15 GMT Received: from unknown(172.17.128.171) by gauntlet.mail.dstl.gov.uk via smap (3.2) id xma020405; Fri, 23 Nov 01 13:03:57 GMT Received: from FRN-MAIL-R3.dstl.gov.uk (unverified) by mailguard.dstl.gov.uk (Content Technologies SMTPRS 4.1.5) with ESMTP id for ; Fri, 23 Nov 2001 12:43:20 +0000 Received: by frn-mail-r3.dstl.gov.uk with Internet Mail Service (5.5.2650.21) id ; Fri, 23 Nov 2001 12:38:56 -0000 Message-ID: <7D653C9C42F5D411A27C00508BF8803D55C643@PDW-MAIL-R1> From: "Talbot Andrew" To: "LF Group \(E-mail\)" Subject: LF: Missing IC Function (off topic) Date: Fri, 23 Nov 2001 12:38:40 -0000 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Does anyone know of a chip that does the following function : A serially loaded high-sided driver several outputs, with outpult voltage rating greater than 15V and current > 100mA. The sort of function that would normally be met by a latched shift register plus a handful of medium current PNP devices or P channel FETs. The only ones I can find are the UCN5810/1/2 or UCN6809-1868. family and they are only rated at 25mA.due to Vce drop across emitter follower NPN drivers. Are there any in the 100 to 500mA rating ? I'm sure there must be a huge number of designers who want this in a single chip, and it can hardly be a difficult IC fabrication task. It is surely possible to fabricate medium current PNP transistors on the same die as NPN. There are quintillions of the NPN equivalent low sided switch - just about every micro controller to relay interface uses one ! (Needed to automatically switch power rails to a range of VCO modules depending on frequency, in a wide band synthesizer under computer controll) Andy G4JNT -- The Information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful.