GX9533 Datasheet, PDF (7/8 Pages) Gennum Corporation – Serial Digital 8x9 Crosspoint

OUTPUT LEVEL SELECT
A single resistor, R_SET, is used to set the amplitude of all
differential outputs. Table 3 shows the value of R_SET vs
output drive capability.
USING THE GX9533 TO EXPAND LARGER MATRICES
The GX9533 pin-out and architecture provides a number of
advantages over other crosspoint switches in the area of
switching matrix board layout.
TABLE 3: R_SET vs V_OUT
R_SET
V_OUT (mV)
2k
800
4k
450
6k
450
OUTPUT R_L
100
100
200
MODE
PECL
Power Save 1
Power Save 2
GX9533
GX9533
IN0 to IN7
IN0 to IN7
OUT0 to OUT7
OUT0 to OUT7
t_DLY
Fig. 5 GX9533 Data Latency
OA_N, IA_N
t_LP
LOAD/LOADA
t_ILS
t_OLS
t_ILH
t_OCH
t_CP
CONFIGURE
t_LC
Fig. 6 LOAD/LOADA and Configure Timing
CONFIGURE
t_CD
OUT 0 TO OUT 7
OUT 0 TO OUT 7
Fig. 7 Configure to Data Out Delay
R_SET
STD/ECL2
GX9533
STD/ECL1
Fig. 8 GX9533 R_SET Connection
GX9533
GX9533
OUTPUTS 0-7
OUTPUTS 8-15
Fig. 9 Crosspoint Matrix Expansion - 16x16 Crosspoint Matrix
BUS THROUGH™ PIN CONNECTIONS
To easily facilitate a switching matrix design where inputs
can be bussed across a matrix of crosspoint devices,
Gennum's crosspoint device has "NC" pins opposite the
input pins as shown by the dotted lines in the pin-out
diagram above. This design allows bussing of inputs
without having to use "vias" to get below the top layer of the
printed circuit board.
EXPANSION PORT INPUT
The expansion inputs provide the following benefits:
• by not having to run traces from the outputs of the
crosspoint switch to a common output bus, crosstalk
between output channels can be greatly reduced.
• fewer circuit board layers are required because the
outputs of each device simply line up
• there are no transmission line effects caused by
connecting High-Z outputs to an output bus
• because the output signal is being routed from the top
of the switching matrix to the bottom through the
devices, inputs can be simply bussed across the board
without having to worry about input/output crosstalk.
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