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Browse Prior Art Database

Multi-use Time Delay Footprint

IP.com Disclosure Number: IPCOM000108108D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Capps Jr, L: AUTHOR [+9]

Abstract

This article describes a scheme wherein a multi-use time-delay footprint provides the ability to use time-delay modules that follow different pin-out standards.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 95% of the total text.

Multi-use Time Delay Footprint

       This article describes a scheme wherein a multi-use
time-delay footprint provides the ability to use time-delay modules
that follow different pin-out standards.

      The problem involves surface mount time-delay (SMT) devices of
the active type.  These 8-pin devices come in two basic
configurations.  Although they are similar, a card designed for a
"Style A" device, as shown in Fig. 1, will not allow the placement of
a "Style B" device, as shown in Fig. 2.  Two pins on the "Style B"
device would straddle two pads of the "Style A" footprint on the
card.

      The scheme disclosed herein provides the capability of
accepting either Style "A" or "B" devices on the common raw card.
The "Style A" component is an 8-pin device on .100" pitch with
standard SMT-type pins (.050" pitch).  The "Style B" component is
similar, but with pins 2 and 3 shifted .050".

      The footprint that allows use of either component presumes that
there are 14 pins on the component, and no spaces between them as
shown in Fig. 3.  This puts one additional pad between each pin on
the "Style A" device. With this arrangement, the pins of either type
of device will now rest properly on SMT pads.

      In order to insure proper operation of "Style B" components,
certain pads on the footprint need to be made common.  Numbering from
1 to 14, those pads are 3 shorted to 4, and 5 shorted to 6.

      One common footprint, thus, one common ca...