December 2008 Rev 3 1/26
26
STHDLS101T
AC coupled HDMI level shifter
with configurable HPD output
Features
■ Converts low-swing alternating current (AC)
coupled differential input to high-definition
multimedia interface (HDMI) rev 1.3 compliant
■ HDMI level shifting operation up to 2.7 Gbps
per lane
■ Integrated 50-Ω termination resistors for AC-
coupled differential inputs
■ Input/output transition minimized differential
signaling (TMDS) enable/disable
■ Output slew rate control on TMDS outputs to
minimize electromagnetic interference (EMI)
■ Fail safe outputs for backdrive protection
■ No re-timing or configuration required
■ Inter-pair output skew < 250 ps
■ Intra-pair output skew < 10 ps
■ Single power supply of 3.3 V
■ ESD protection: ±6 KV HBM on all I/O pins
■ Integrated display data channel (DDC) level
shifters. Pass-gate voltage limiters allow 3.3 V
termination on graphics and memory controller
hub (GMCH) pins and 5 V DDC termination on
HDMI connector pins
■ Level shifter and configurable output for HPD
signal from HDMI/DVI connector
■ Integrated pull-down resistor on HPD_SINK
and OE_N inputs
Applications
■ Notebooks
■ PC motherboards and graphic cards
■ Dongles/cable adapters
Description
The STHDLS101T is a high-speed high-definition
multimedia interface (HDMI) level shifter that
converts low-swing AC coupled differential input
to HDMI 1.3 compliant open-drain current
steering RX-terminated differential output.
Through the existing PCI-E pins in the graphics
and memory controller hub (GMCH) of PCs or
notebook motherboards, the pixel clock provides
the required bandwidth (1.65 Gbps, 2.25 Gbps)
for the video supporting 720p, 1080i, 1080p with a
total of 36-bit resolution. The HDMI is multiplexed
onto the PCIe pins in the motherboard where the
AC coupled HDMI at 1.2 V is output by GMCH.
The AC coupled HDMI is then level shifter by this
device to 3.3 V DC coupled HDMI output.
The STHDLS101T supports up to 2.7 Gbps,
which is enough for 12-bits of color depth per
channel, as indicated in HDMI rev 1.3. The device
operates from a single 3.3 V supply and is
available in a 48-pin QFN package.
QFN-48
(7 x 7 mm)
Table 1. Device summary
Order code Package Packaging
STHDLS101TQTR QFN-48 Tape and reel
www.st.com
Obsolete Product(s) - Obsolete Product(s)
