17 Aug
2012
17 Aug
'12
10:40 a.m.
Hi Chuck I would guess you are correct here. I just recall using a numberof Signetics
555's and they were SE555's I'd always thoughtthe NE555 number was National
Semi's number.I do recal the S5400/N7400 numbering, now that you mentionit.The
555's were much better than the 74121/122 chips forlonger pulses. It may not have been
an error. Some of these part werefussy about temperature. Maybe the meant C.Anyway the air
conditioning bill would put most people offwhen using these ;)Dwight > From: cclist at
sydex.com
To: cctalk at classiccmp.org
Date: Fri, 17 Aug 2012 09:56:56 -0700
Subject: RE: Hans Camenzind, Inventor of the 555, dies.
On 17 Aug 2012 at 6:45, dwight elvey wrote:
Hi
Atually SE555, not NE555 that was a licenced copy.
Dwight
Hi Dwight,
Are you certain? My Signetics Linear databooks indicate that the SE
part was the mil-spec, extended-temperature range version of the
commercial grade NE555. (If you look at the 1972 ("advance notice")
datasheet, it's funny--the temperature range for the SE555 is given
as -55 to +12.5 degrees! Little typo there.)
Signetics follwed this convention with their other lines. For
example, the TTL family was S5400/N7400.
--Chuck