CM2020-00TR
Application Information (cont’d)
Design Considerations
ESD Bypass
Pin 37 (ESD_BYP) is provided for an optional external ESD bypass capacitor only (i.e. 0.1mF ceramic.) It
should not be connected to any supply rail.
5V Overcurrent Output
Maximum Overcurrent Protection output drop at 55mA on 5V_OUT is 100mV. To meet HDMI output
requirements of 4.8-5.3V, an input of greater than 4.9V should be used (i.e. 5.1V +/- 4%). A 0.1µF ceramic
bypass capacitor on this output is also recommended.
Hotplug Detect Input
To meet the requirements of HDMI CTS TID7-12, the following pullup/pulldown configuration is recommended
for a 3.3V+/-10% internal VCC rail (See Figure 4 below). A 0.1µF ceramic capacitor is recommended for
additional edge debounce and ESD bypass.
DUT On vs. DUT Off
Many HDMI CTS tests require a power off condition on the System Under Test. Many Dual Rail Clamp (DRC)
ESD diode configurations will be forward biased when their VDD rail is lower than the I/O pin bias, thereby
TM
exhibiting extremely high apparent capacitance measurements, for example. The MediaGuard backdrive
isolation circuitry limits this current to <5µA, and will help ensure compliance.
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