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VOLUME -23 NUMBER 2
Publication Date: 02/1/2008
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February 2008 Issue
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Tyco/Raychem Intros 1st ESD & Overcurrent Layout
ESD and overcurrent protection devices.
Menlo Park, CA — Tyco Electronics' Raychem Division has introduced a reference layout for ESD and overcurrent protection for HDMI
1.3 interfaces. It utilizes the company's low-capacitance (0.25pF signal to ground) PESD protection devices, and space-effective component placement and routing to help protect against ESD events and optimize board space. The reference layout also includes optional overcurrent protection on the +5V rail, using the PolySwitch
According to the company, the newest HDMI 1.3 standard doubles the previous HDMI data rate to 3.4Gbps per differential signal pair. With such high data transmission rates, low capacitance and good board design are crucial to provide adequate signal integrity. The new layout for HDMI 1.3 was developed in conjunction with Efficere, Inc., and meets or exceeds the HDMI 1.3 specifications for operation at 3.4Gbps for Impedance (TDR), Data Eye, and Far End Crosstalk.
The bi-directional PESD0603 or PESD0402 devices are configured in a very small space behind the HDMI connector and help designers meet the IEC 61000-4-2 standard for ESD protection (±15kV for air, ±8kV for contact). The PESD devices are offered in EIA standard 0603 and 0402 sizes and can be used in various end applications, including DisplayPort, WiMAX and cellular base stations, eSATA, and other high-speed data and analog interfaces.
In HDMI source devices, such as DVD players, set-top boxes, computers and other HD sources, the specification requires that the transmitter interface's voltage rail include overcurrent protection to prevent short circuit or abnormally high current from damaging the source device.
The protection layout includes optional overcurrent protection on the +5V rail, using the popular PolySwitch nanoSMD circuit protection device.
For more information, contact: Tyco Electronics, P.O. Box 3608, MS 38-41, Harrisburg, PA 17105-3608
800-522-6752 or 215-657-6202 E-mail: email@example.com Web:
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