IP4786CZ32 Datasheet, PDF (1/35 Pages) NXP Semiconductors – DVI and HDMI interface ESD and overcurrent protection, DDC/CEC buffering, hot plug

IP4786CZ32
DVI and HDMI interface ESD and overcurrent protection,
DDC/CEC buffering, hot plug detect and backdrive protection
Rev. 1 — 15 April 2011
Product data sheet
1. General description
The IP4786CZ32 is designed to protect High-Definition Multimedia Interface (HDMI)
transmitter host interfaces. It includes HDMI 5 V overcurrent / overvoltage protection, Data
Display Channel (DDC) buffering and decoupling, hot plug detect, backdrive protection,
Consumer Electronic Control (CEC) buffering and decoupling, and ±8 kV contact
ElectroStatic Discharge (ESD) protection for all I/Os in accordance with the
IEC 61000-4-2, level 4 standard.
The IP4786CZ32 incorporates Transmission Line Clamping (TLC) technology on the
high-speed Transition Minimized Differential Signaling (TMDS) lines to simplify routing
and help reduce impedance discontinuities. All TMDS lines are protected by an
impedance-matched diode configuration that minimizes impedance discontinuities caused
by typical shunt diodes.
The enhanced 60 mA overcurrent / overvoltage linear regulator guarantees
HDMI-compliant 5 V output voltage levels with up to 6.5 V inputs.
The DDC lines use a new buffering concept which decouples the internal capacitive load
from the external capacitive load for use with standard Complementary Metal Oxide
Semiconductor (CMOS) or Low Voltage Transistor-Transistor Logic (LVTTL) I/O cells
down to 1.8 V. This buffering also redrives the DDC and CEC signals, allowing the use of
longer or cheaper HDMI cables with a higher capacitance. The internal hot plug detect
module simplifies the application of the HDMI transmitter to control the hot plug signal.
All lines provide appropriate integrated pull-ups and pull-downs for HDMI compliance and
backdrive protection to guarantee that HDMI interface signals are not pulled down if the
system is powered down or enters Standby mode. Only a single external capacitor is
required for operation.
2. Features and benefits
„ HDMI 1.3a and 1.4, 340 MHz pixel clock, deep color and HDMI Ethernet and Audio
return Channel (HEAC) compatible
„ Pb-free, Restriction of Hazardous Substances (RoHS) compliant and free of halogen
and antimony (Dark Green compliant)
„ Robust ESD protection without degradation after repeated ESD strikes
„ Impedance matched 100 Ω differential transmission line ESD protection for
TMDS lines (±10 Ω). No Printed-Circuit Board (PCB) pre-compensation required
„ All external I/O lines with ESD protection of at least ±8 kV in accordance with the
IEC 61000-4-2, level 4 standard