Just fired up the board, the bottom left was in fact pin 1. On Fri, Apr 1, 2011 at 10:12 AM, Joe Chisolm - Gmail <jchiso...@gmail.com> wrote: > If the lot marking is oriented so you can read it pin 1 should be lower > left but verify from the tape reel. Look at page 15 of > > http://focus.ti.com/lit/an/szza021c/szza021c.pdf > > The basic rules are (from page 15): > > Component orientation in the carrier-tape pocket is governed by EIA-783, > which states that the > following orientation rules shall be followed, sequentially, until no other > variation is possible (see > Figure 11): > 1. The largest axis of the component outline shall be perpendicular to the > tape length. > 2. The edge of the package containing termination 1 shall be oriented toward > the round > sprocket holes. > 3. For the components where rule 1 and rule 2 do not establish a unique > orientation, > termination 1 shall be in quadrant 1 (see Figure 12). > Typical TI component orientation is shown in Figure 13. > > On 04/01/2011 11:35 AM, yamazakir2 wrote: >> >> The datasheet is pretty ambiguous, take a look and let me know what >> you guys think: >> >> http://focus.ti.com/lit/ds/symlink/sn74lvc1g3157.pdf >> >> On Fri, Apr 1, 2011 at 5:21 AM, Cullen Newsom<cullennew...@gmail.com> >> wrote: >>> >>> Have you got a part number for it? What's inside? You could use a DMM >>> to confirm, if you consider its internals. Your guess of bottom left >>> seems reasonable. >>> -CN >>> >>> On Fri, Apr 1, 2011 at 4:13 AM, yamazakir2<[1]yamazak...@gmail.com> >>> wrote: >>> >>> I'm guessing based off that mark the bottom left pin is pin 1. The >>> datasheet isn't clear. Does anybody know for sure if thats pin 1? >>> _______________________________________________ >>> geda-user mailing list >>> [2]geda-user@moria.seul.org >>> [3]http://www.seul.org/cgi-bin/mailman/listinfo/geda-user >>> >>> References >>> >>> 1. mailto:yamazak...@gmail.com >>> 2. mailto:geda-user@moria.seul.org >>> 3. http://www.seul.org/cgi-bin/mailman/listinfo/geda-user >>> >>> >>> >>> _______________________________________________ >>> geda-user mailing list >>> geda-user@moria.seul.org >>> http://www.seul.org/cgi-bin/mailman/listinfo/geda-user >>> >>> >> >> _______________________________________________ >> geda-user mailing list >> geda-user@moria.seul.org >> http://www.seul.org/cgi-bin/mailman/listinfo/geda-user >> > > -- > Joe Chisolm > Marble Falls, Tx. > 830-265-8018 > > > > _______________________________________________ > geda-user mailing list > geda-user@moria.seul.org > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user >
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