www.ite.com.tw
Nov-2009 Rev:0.6 1/11
IT6633E-P
3-to-1 HDMI 1.3 Active Switch with EDID RAM
Preliminary Datasheet
ITE TECH. INC.
IT6633
www.ite.com.tw
Nov-2009 Rev:0.6 2/11
General Description
The IT6633 is a three-to-one HDMI v.1.3 active switch that supports a signalling rate of up to
2.25Gbps and the new Deep Color modes. A one-port SINK systems such as flat-panel TVs or LCD
projectors could also easily upgrade to three-port by adding an IT6633 at the front. The IT6633
operates in software mode that allows the system to control it via a two-line serial interface,
PCSCL/PCSDA. The IT6633 offers two selectable serial programming addresses by PCADR0.
As a active switch, the IT6633 equalizes incoming TMDS data with optimal quality regardless of the
incoming signal quality. The highly acclaimed equalization technology of ITE TECH. INC. provides for
support of long or low-quality HDMI cables at even the highest speeds. Input terminations of the
TMDS inputs and output current levels are both programmable. In addition, the input terminations are
disconnectable and hence significantly lower the system power consumption in inactive modes.
The IT6633 embeds an EDID RAM to save the cost of the Three external EDID ROMs. The process of
downloading the EDID data into the RAM is simplified by the automatic read-back capability of the
IT6633, minimizing the need of MCU intervention. The IT6633 also embeds three 1K-ohm resisters for
HPD signal paths to save external resisters and easy to implement the plug authentication.
The IT6633 also incorporates I
2
C repeater in its DDC switches, which isolates the DDC capacitances
of the two sides of the switch. This allows for longer cable cascading as well as significantly eases the
system design to pass Test ID 8-9: DDC/CEC Line Capacitance and Voltage of the HDMI
Compliance Test.
The IT6633 also distinguish itself from its peers in that it offers ±8kV of Human Body Mode ESD
protection to all TMDS high-speed input pins. This saves significant costs in external high-speed ESD
diodes, which could be very expensive .
IT6633
www.ite.com.tw
Nov-2009 Rev:0.6 3/11
Features
HDMI active switch, providing superior performance over traditional passive switches
Compliant with HDMI 1.3 and DVI 1.0 standards
Serial data rate at up to 2.25Gbps, capable of supporting the following digital video formats in Deep
Color Mode at up to 36 bits (12 bits/color):
DTV resolutions: 480i, 576i, 480p, 576p, 720p, 1080i to 1080p
PC resolutions: VGA, SVGA, XGA, SXGA to UXGA
Single 3.3V operation
Internal AC-coupling at TMDS inputs to cope with uneven intra-pair DC levels of incoming TMDS
signals.
Embedded EDID RAM saves external EDID ROM costs
Embedded HDP resistors
Integrated HPD switches
Active port detection by monitoring PWR5V inputs and TMDS input clock.
DDC I
2
C repeater isolates backend DDC capacitive loading from frontend, enhancing the DDC
operation compatibility
Human Body Mode ESD protection up to ±8kV for all TMDS differential input pins
Disconnectable input terminations with auto-calibrated impedances
Adaptive input equalization supporting long and short cables at the same time
Software-mode operation providing flexibility
Two possible serial programming device address..
Programmable TMDS output current level
Programmable source terminations compliant with HDMI 1.3 standard, providing optimal source
data eyes at high speeds
High-impedance TMDS output when disabled
Optional backend receiver termination detection for auto powerdown
64-Pin LQFP package
RoHS Compliant ( 100% Green available )
Ordering Information
Model Temperature Range Package Type Green/Pb free Option
IT6633E-P 0~70 64-pin LQFP Green
IT6633
www.ite.com.tw
Nov-2009 Rev:0.6 4/11
Pin Diagram
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16151413121110987654321
CRX2P
NC
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
33343536373839404142434445464748
CRX2M
VCC
CRX1P
CRX1M
VSS
CRX0P
CRX0M
CPWR5V
CRXCP
CRXCM
CSCL
CSDA
CHPD
TXPWR5V
ARXCM
ARXCP
VCC
ARX0M
ARX0P
VSS
ARX1M
ARX1P
NC
ARX2M
ARX2P
REXT
NC
ASCL
ASDA
RESET
Figure 1. IT6633 pin diagram
