1. General description
The PTN3360A is a high-speed level shifter device which converts four lanes of low-swing
AC-coupled differential input signals to DVI v1.0 and HDMI v1.3a compliant open-drain
current-steering differential output signals, up to 2.5 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
PTN3360A provides a single-ended active 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 providing 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 PTN3360A 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 or
HDMI v1.3a specification. By using PTN3360A, 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 PTN3360A 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
I
2
C-bus channel level-translates the DDC signals between 3.3 V (source) and 5.0 V (sink).
The PTN3360A is a fully featured HDMI as well as DVI level shifter. It is functionally
equivalent to PTN3300A but provides higher speed performance and higher ESD
robustness. The PTN3360A is also equivalent to PTN3360B with the exception that
PTN3360A provides inverting level shifting on the HPD channel.
PTN3360A is powered from a single 3.3 V power supply consuming a small amount of
power (120 mW typ.) and is offered in a 48-terminal HVQFN48 package.
PTN3360A
Enhanced performance HDMI/DVI level shifter with inverting
HPD
Rev. 02 — 8 October 2009 Product data sheet
