IP4778CZ38

General description

The IP4778CZ38 is designed for HDMI receiver host interface protection. The IP4778CZ38 includes DDC buffering, slew rate acceleration and decoupling, hot plug control, backdrive protection, CEC slew rate control, optional multiplexing of DDC signals, and high-level ESD protection diodes for all HDMI signals.

The DDC lines are buffered using a new buffering concept which decouples the internal capacitive load from the external capacitive load. This allows higher PCB design flexibility for the DDC lines with respect to the maximum load of 50 pF specified in the HDMI 1.3 specification. This buffering also boosts the DDC signals, allowing the use of longer HDMI cables having a higher capacitive load than 700 pF. The CEC slew rate limiter prevents ringing on the CEC line and greatly reduces the number of discrete components needed by the CEC application. HDMI receiver and system GPIO applications are simplified by an internal hot plug driver module and hot plug control.

The DDC, hot plug and CEC lines are backdrive protected to guarantee HDMI interface signals are not pulled down if the system is powered down or enters Standby mode.

All TMDS intra-pairs are protected by a special diode configuration offering a low line capacitance of 0.7 pF only (to ground) and 0.05 pF between the TMDS pairs. These diodes provide protection to components downstream from ESD voltages of up to +-8 kV contact in accordance with the IEC 61000-4-2, level 4 standard.

Features

• HDMI 1.3 compliant
• Pb-free and RoHS compliant
• Robust ESD protection without degradation after several ESD strikes
• Low leakage even after several hundred ESD discharges
• Very high diode switching speed (ns) and low line capacitance of 0.7 pF to ground and 0.05 pF between channels ensures signal integrity
• DDC capacitive decoupling between system side and HDMI connector side and drive cable buffering with capacitive load (> 700 pF)
• Hot plug control for direct connection to system GPIO
• CEC ringing prevention by slew rate limiter
• DDC and hot plug enable signal for multiplexing and backdrive protection
• All TMDS lines with integrated rail-to-rail clamping diodes with downstream ESD protection of +-8 kV in accordance with IEC 61000-4-2, level 4 standard
• Matched 0.5 mm trace spacing
• Component count reduction of HDMI receiver application
• Highest integration in a small footprint, PCB-level, optimized RF routing, 38-pin TSSOP lead-free package
• Choice of system compatible or RF routing optimized pinning variants

Products/packages

Pricing/ordering/availability

Applications

• The IP4778CZ38 can be used for a wide range of HDMI sink devices e.g.:
  • TV
  • Projectors
  • PC monitors
  • HDMI buffer modules (extensions of HDMI cable length)
  • HDMI picture performance quality enhancer modules

Technical documents

Support Documents

75015759; EMI filter and ESD protection Mobile phone applications (2006-11-01)

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