IP4786CZ32 NXP Semiconductors, IP4786CZ32 Datasheet - Page 19

• Manufacturer Part Number: IP4786CZ32
• Description: DIODE, ESD, HDMI INTERFACE, SOT617
• Manufacturer: NXP Semiconductors

Specifications of IP4786CZ32

• Diode Type: HDMI ESD Interface
• Power Dissipation Pd: 50mW
• Clamping Voltage Vc Max: 8V
• Operating Voltage: 5V
• Diode Case Style: HVQFN
• No. Of Pins: 32
• External Depth: 5.1mm
• External Length /: RoHS Compliant

NXP Semiconductors
11. Application information
IP4786CZ32
Product data sheet
11.1 TMDS ESD
To protect the TMDS lines and also to comply with the impedance requirements of the
HDMI specification, the IP4786CZ32 provides ESD protection with matched
TLC ESD structures. Typical Dual Rail Clamp (DRC) or rail-to-rail shunt structures are
common for low-capacitance ESD protection (as shown on the left side of
where the dominant factor for the TMDS line impedance dip is determined by the
capacitive load to ground. Parasitic lead inductances of the packaging in this case works
against the ESD clamping performance by including the ΔI/Δt reactance of the inductance
into the path of the ESD shunt.
The IP4786CZ32 utilizes these inherent inductances in series with the transmission line in
order to present an effective capacitive load of roughly only 0.7 pF. This TLC structure
minimizes the capacitive dip, for ideal signal integrity
complicated PCB pre-compensation. As a beneficial side effect, this enhances the
ESD performance of the device as well, since the reactance of the series inductance
attenuates the fast initial peak of the ESD pulse, for a lower residual pulse delivered to the
Application Specific Integrated Circuit (ASIC).
Fig 20. TLC ESD protection of TMDS lines
a. Classic parallel ESD shunt protection
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 15 April 2011
018aaa101
DVI and HDMI interface ESD and overcurrent protection
b. Improved series shunt TLC clamping
(Figure
20; right side) without
IP4786CZ32
© NXP B.V. 2011. All rights reserved.
Figure
018aaa102
20)
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