Datasheet

MAX3816A
I
2
C 2-Wire Extender for DDC in DVI,
HDMI, and VGA Interfaces
______________________________________________________________________________________ 15
MAX3816A External to Display, In Parallel
Advantages (See Figure 8)
• Medium-long cable reach.
• In parallel mode, the MAX3816A is very tolerant of
noncompliant DDC sources and sinks.
• The MAX3816A can be turned off if another
MAX3816A or speed-up device is being used on the
same DDC.
• The MAX3816A can be turned off without isolating
the display from the source side, letting DDC oper-
ate straight through unassisted or assisted.
Consideration
Long cable reflections can reach display circuits since
the MAX3816A is not used as a buffer between source
and display. Hence, very long cables could cause dou-
ble-clocking at display circuits due to stair-step rise/fall
waveforms due to reflections.
Figure 8. External to Display, In Parallel
DRVR_EN
V
CC
CLOCK_C
DATA_C
GND_REF
CLOCK_D
V
SS
DATA_D
V
DD
DDC SCL
DDC SDA
DDC +5V
CONNECTOR TO DISPLAY
DVI, HDMI, OR M1 CONNECTOR, < 3m
47kΩ47kΩ
10μF
10μF
LONG CABLE FROM VIDEO SOURCE:
DVI, HDMI, OR CAT-5 CABLE UP TO 60m
(200ft)
V
CC
SHIELD GNDS
DDC SCL
DDC SDA
DDC +5V
SHIELD GNDS
DDC GND
DDC GND
CABLE HEAD OR EXTENDER BOX
V
DD
OR V
SS
(SEE DESCRIPTION)
MAX3816A
*TO MEET DVI/HDMI SPECIFICATIONS FOR THE DDC +5V LINK, THE V
DD
SIDE OF THE MAX3816A MUST BE EXTERNALLY POWERED. IF NOT APPLICABLE, CONNECT TO DDC +5V.
5V*
MODE
V
DD