STHDLS101 Application information
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6 Application information
6.1 Power supply sequencing
A proper power supply sequencing is advised for all CMOS devices. It is
recommended to always apply V
CC
before applying any signals to the input/output
or control pins.
6.2 Supply bypassing
Bypass each of the V
CC
pins with 0.1µF and 1nF capacitors in parallel as close to the device
as possible, with the smaller valued capacitor as close to the V
CC
pin of the device as
possible.
6.3 Differential traces
The high-speed inputs and TMDS outputs are the most critical parts for the device. There
are several considerations to minimize discontinuities on these transmission lines between
the connectors and the device.
a) Maintain 100 Ω differential transmission line impedance into and out of the device.
b) Keep an uninterrupted ground plane below the high-speed I/Os.
c) Keep the ground-path vias to the device as close as possible to allow the shortest
return current path.
d) Layout of the TMDS differential outputs should be with the shortest stubs from the
connectors.
Output trace characteristics affect the performance of the STHDLS101. Use controlled
impedance traces to match trace impedance to both the transmission medium impedance
and termination resistor. Run the differential traces close together to minimize the effects of
the noise. Reduce skew by matching the electrical length of the traces. Avoid discontinuities
in the differential trace layout. Avoid 90
° C turns and minimize the number of vias to further
prevent impedance discontinuities.
Obsolete Product(s) - Obsolete Product(s)
