Datasheet

Connectors
7–320
2.4 Connectors
An AMP Z-PACK 2-mm, 110-pin, hard-metric (HM) male connector is used
in slots 1 through 20 (see Figure 2–5) .
Figure 2–5. AMP Z-PACK  2-mm, 110-Pin, Hard-Metric (HM) Male Connector
Five pins are used on the backplane, with three different lengths on the
backplane daughter-card side. Pins A, B, and C are used for data/V
CC
,
BIAS V
CC
, and GND, respectively. C-length pins are in the center, and
A-length pins are in two rows on either side. The daughter-card connectors
P1-1 through P1-20 use these three levels of pin height for power sequencing.
The ground pins make contact first, followed by a pin for BIAS V
CC
, then all
other connections are made. There is only one B-length pin because BIAS V
CC
can be distributed to all four GTLP devices on the board. The pin lengths of
pins K and T are identical to those of pins A and C on the card side, but they
protrude through the backplane board, providing connection to the termination
cards that are on the reverse side.
Initial testing revealed that this pin configuration was unacceptable for actual
operation because the BIAS V
CC
circuitry was disabled before all I/O pins were
connected. Any tilt on the card caused V
CC
to be connected first. Some slots
in selected EVMs have been modified, so that BIAS V
CC
and GND are
C length, data signal is B length, and V
CC
is A length, to allow proper operation
of the BIAS V
CC
precharge circuitry.
Various AMP pin lengths, including pins A, B, C, K, and T, are shown in
Figure 2–6, and the single-line-model data sheet is shown in Figure 2–7.