MAX3816ACUE+ Maxim Integrated Products, MAX3816ACUE+ Datasheet - Page 6

• Manufacturer Part Number: MAX3816ACUE+
• Description: IC I2C 2WIRE EXTENDER 16-TSSOP
• Manufacturer: Maxim Integrated Products
• Type: DDC (Digital Down Converter) Extenderr

Specifications of MAX3816ACUE+

• Applications: HD Displays, DVI/HDMI
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

I
HDMI, and VGA Interfaces
The MAX3816A has parallel and series modes. The
parallel mode is preferred for applications where high
tolerance to noncompliant source and sink devices is
desired (noncompliant V
pliant V
allel mode can be operated with other speed-up
devices on the same bus, either active (DRVR_EN = HI)
or in bypass (DRVR_EN = LO).
Series mode is preferred for applications where high
tolerance to ground offset or noise between and source
and sink is needed. Series mode also isolates display
circuits from transmission line reflections in very long
cables, providing full isolation between cable and dis-
play buses. For in-display applications, series mode
can provide level shifting between the 5V cable DDC
and 3.3V display internal DDC.
A single MAX3816A is applied at the display side of the
video link to compensate for excessive cable capaci-
tance. The overall operation of the MAX3816A, for
6
2
8, 9, 10
_______________________________________________________________________________________
C 2-Wire Extender for DDC in DVI,
PIN
11
12
13
14
15
16
1
2
3
4
5
6
7
IH
from sources are common). Further, the par-
CLOCK_C
CLOCK_D
DRVR_EN
GND_REF
GND_REF
DATA_C
DATA_D
NAME
MODE
V
DNC
V
V
V
V
SS_T
CC
CC
DD
SS
Theory of Operation
OL
Driver Enable Input, LVTTL/LVCMOS. Set high to enable all data and clock drivers for normal
operation. Set low to disable drivers, permitting isolation of cable bus from display bus.
Power Supply for Cable Side. In the DDC application, connect to DDC +5V. Connect 10μF or larger
bypass capacitor as shown in Figure 6.
I
Cable-Side Ground Return. Connect directly to cable DDC ground wire. The MAX3816A circuitry uses
the video source DDC GND as a threshold reference. Also connect 10μF or larger bypass capacitors
as shown in Figure 6.
I
Cable-Side Ground Return (Alternate). Connected internally to pin 4 above.
Power Supply for Cable Side (Alternate). Connected internally to pin 2 above.
Do Not Connect
Power Supply for Display Side and Core Circuitry. Connect bypass capacitor as shown in Figure 6.
I
or a 3.3k
Ground for Display Side and Core Circuitry. Connect bypass capacitors as shown in Figure 6.
I
or a 3.3k
Must Be Connected to V
Mode Setting Input, LVTTL/LVCMOS. Force high for parallel mode (normal operation) and force low for
serial operation.
2
2
2
2
C Cable-Side Clock with Cable Driver, CMOS Input/Output. Connect a 47k
C Cable-Side Data with Cable Driver, CMOS Input/Output. Connect a 47k
C Display-Side Data, CMOS Input/Output. Connect a 2.2k
C Display-Side Clock, CMOS Input/Output. Connect a 2.2k
from displays and noncom-
pullup resistor to V
pullup resistor to V
SS
for Normal Operation
DD
DD
for V
for V
DD
DD
either the DATA or CLOCK signal, can be summarized
as follows (Figures 1a and 1b).
1) High state. Drivers off. Level sensing on.
2) High-to-low transition. Drivers assert low. Level
= 5V.
= 5V.
If no client device is controlling the “wired-AND” bus
from either the source or display side, all device dri-
vers are off and the bus (including the MAX3816A)
is waiting in the high state. The pullup resistors on
each side are holding the bus up to V
source side and V
sensing off (Holdoff).
A change of state is initiated by any device driver
pulling low. Once the signal transitions below 75%
of the power supply, the MAX3816A drives both the
source and display sides toward ground with a low-
impedance driver, level sensing is turned off, and
the holdoff timer is started. The source side is
pulled down to the level of the V
plished using a low-impedance n-channel buffer
that is designed to drive a 1 meter (60pF) to 60
FUNCTION
pullup resistor to V
pullup resistor to V
DD
on the display side.
Pin Description
pullup resistor to V
pullup resistor to V
DD
DD
SS
for V
. This is accom-
for V
DD
DD
CC
= 3.3V,
= 3.3V,
on the
CC
CC
.
.