1
FN6303.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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ISL54103
DDC Accelerator (DDCA)
The ISL54103 DDC Accelerator (DDCA) is a dual active pull-up
bus terminator designed to improve data transmission speed
on the DDC 2-wire serial bus interfaces.
The DDCA detects rising input transitions with two internal
voltage references and two comparators per channel. After
the voltage on a data line crosses the first threshold
(V
TRIPL
), the boost pull-up current source is activated to
speed transition. After the voltage crosses the second
threshold (V
TRIPH
), the boost pull-up current source is
de-activated, leaving an active pull-up current of 275µA on
the line. When both channels are HIGH, the pull-up current
for both lines is reduced to 100µA to save power. Internal
logic ensures that the active and boost pull-up current
sources are not activated during downward transitions.
The level for V
TRIPH
is controlled by a bandgap voltage
referred to V
DD
. This feature makes the switching behavior
invariant for all power supply voltages between 2.7V and 5.5V.
A noise filter on each channel prevents the circuit from
responding to input transitions that do not exceed a
voltage-time threshold. To activate the boost circuit, the input
must exceed V
TRIPL
by 100Vns (typical) (See Figure 10).
The DDCA permits operation of the bus at frequencies up to
100kHz, despite the capacitive loads of multiple devices
and/or long PC board traces. Enhanced ESD protection on
the accelerator pins are guaranteed to withstand 8kV ESD
(HBM) events.
The DDC Accelerator provides an essential function in DDC
applications because of distributed capacitance of the DDC
wires in long video cables. By incorporating DDCA, systems
using DDC can reliably increase their bus load, allowing
longer cables, without the risk of data corruption.
Features
• Active Termination for DDC Lines
• Enhances System Bus Signal Rise Time
• More Reliable HDCP Performance In Video Multiplexers
and Cable Extenders
• Increases Maximum Cable Length While Guaranteeing
Data Integrity
• 2.2mA Current Boost on Low to High Transitions
• 8kV ESD Protection on SDA and SCL Pins
• Wide Operating Voltage Range: 2.7V to 5.5V
• Small Package - 5 Ld SOT-23
• Pb-free (RoHS Compliant)
Target Applications
• Video Multiplexers
• Video Cable Extenders
• Video Distribution Amplifiers
• Televisions
• Computer Monitors
•Projectors
Pinout
ISL54103
(5 LD SOT-23)
TOP VIEW
V
DD
1
2
3
4
5
N.C.
DDC1
GND
DDC2
Data Sheet October 14, 2011
