PTN3300A Datasheet, PDF (1/23 Pages) NXP Semiconductors – DVI/HDMI level shifter with inverting 1.1 V HPD

PTN3300A
DVI/HDMI level shifter with inverting 1.1 V HPD
Rev. 01 — 30 June 2008
Product data sheet
1. General description
The PTN3300A is a high-speed level shifter device which converts four lanes of low-swing
AC-coupled differential input signals to DVI and HDMI compliant open-drain
current-steering differential output signals, up to 2.25 Gbit/s per lane. Each of these lanes
provides a level-shifting differential buffer to translate from low-swing AC-coupled
differential signaling on the source side, to TMDS-type DC-coupled differential
current-mode signaling terminated into 50 Ω to 3.3 V on the sink side. Additionally, the
PTN3300A provides a single-ended active inverting buffer for voltage translation of the
HPD signal from 5 V on the sink side to 1.1 V on the source side and provides a channel
for level shifting of the DDC channel (consisting of a clock and a data line) between 3.3 V
source-side and 5 V sink-side. The DDC channel is implemented using pass gate
technology allowing level shifting as well as disablement (isolation between source and
sink) of the clock and data lines.
The low-swing AC-coupled differential input signals to the PTN3300A typically come from
a display source with multi-mode I/O, which supports multiple display standards, e.g.,
DisplayPort, HDMI and DVI. While the input differential signals are configured to carry DVI
or HDMI coded data, they do not comply with the electrical requirements of the DVI v1.0
specification or HDMI v1.3a specification. By using PTN3300A, chip set vendors are able
to implement such reconfigurable I/Os on multi-mode display source devices, allowing the
support of multiple display standards while keeping the number of chip set I/O pins low.
See Figure 1.
The PTN3300A main high-speed differential lanes feature low-swing self-biasing
differential inputs which are compliant to the electrical specifications of DisplayPort
Standard v1.1 and/or PCI Express Standard v1.1, and open-drain current-steering
differential outputs compliant to DVI v1.0 and HDMI V1.3a electrical specifications. The
PTN3300A also supports power-saving modes in order to minimize current consumption
when no display is active or connected.
The PTN3300A supports level translation functions and features supporting DVI and
HDMI. It is identical to the PTN3300B except that the HPD_SOURCE_N output is the
logic inverse function of input HPD_SINK, level shifted to 1.1 V. For a fully-featured
HDMI/DVI level shifter function that supports active buffering of the DDC lines and HDMI
dongle detect, the PTN3301 should be used.
PTN3300A is powered from a single 3.3 V power supply consuming a small amount of
power (120 mW typ.) and is offered in two different 48-terminal HWQFN packages, one
laminate based (no terminals visible from edge of the package), and one leadframe-based
(terminals visible from edge of the package).