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From: Winfield Hill
Subject: Re: Design for long interval timer
Date: 4 Dec 2002 11:51:23 -0800
Organization: Rowland Institute
References: <email@example.com> <firstname.lastname@example.org> <3DEE0CAB.email@example.com> <3DEE14A6.firstname.lastname@example.org>
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>Spehro Pefhany wrote:
>> Fred Bloggs wrote:
>>> Spehro Pefhany wrote:
>>>> for a timer.. consider using the MC14541.
>>> Hmmm...a few probelms with one:
>>> 1) ON is dropping products left and right;
>> How is that a 'problem'? Fairchild makes them. As do ST.
>> Maybe others. This is an inexpensive jellybean part.
> I just went to Fairchild and entered MC14541 in parts
> search, it returned 0 results...????
The readily-available "replacement" parts are Fairchild's and
TI's CD4541, Philips' HEF4541, and ST's HCF4541. My strong
advice for using logic ICs that include an analog function,
based on years of extensive production experience, is to
design to one manufacturer's part and use this in the B.O.M.,
without allowing purchasing to substitute alternates. Place
the information about possible alternates in the engineering
files, and recheck the design if a substitute is required, or
prequalify alternate parts at the beginning (in which case a
slightly different passive-component value is often required).
The various versions of 4046 PLL chips are a prime example.
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