Path: ...!2.eu.feeder.erje.net!3.eu.feeder.erje.net!feeder.erje.net!weretis.net!feeder8.news.weretis.net!reader5.news.weretis.net!news.solani.org!.POSTED!not-for-mail From: Gerhard Hoffmann Newsgroups: sci.electronics.design Subject: Re: Fast monostable with a transistpor array Date: Fri, 14 Jun 2024 18:20:06 +0200 Message-ID: References: <8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Fri, 14 Jun 2024 16:20:06 -0000 (UTC) Injection-Info: solani.org; logging-data="1705870"; mail-complaints-to="abuse@news.solani.org" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:g02CVPKVZS0pdH6HFn/fP6V0quw= X-User-ID: eJwFwYEBwCAIA7CXRCiFc6aj/59gAk/Ly0hkQNCqsKlRH/+cW9w2ASerj3xxMdjn7v/6QMIDC88QuA== Content-Language: en-US In-Reply-To: <8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com> Bytes: 1919 Lines: 19 Am 14.06.24 um 18:03 schrieb john larkin: > I wonder if one could design really fast stuff with the HFA3046. > Package parasitics look nasty. And the big package will force ugly PCB > routing. You can plop a single tiny transistor wherever you want. > > The HFA parts are either 5 NPNs or 5 PNPs, which is also awkward. I did design a 1:1000 dual slope timer stretcher with them featuring 5 ps resolution. The nice thing was that temp effects cancelled. We tested that with synthesized xtal ovens --> 1pps signal and a 1.0000000??0001 pps that slowly drifted by. With a space proof ceramic flat pack with even worse parasitics. And yes, Methinks it was Harris before, bought up by Renesas. cheers, Gerhard