CM2020-01TR Datasheet CM2020-01TR | P7-P9

CM2020−01TR

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APPLICATION INFORMATION

Figure 3. Typical Application for CM2020−01TR

LAYOUT NOTES

NOTE 1) Differential TMDS Pairs should be

designed as normal 100 W HDMI microstrip.

Single Ended TMDS traces underneath CM2020

and between CM2020 and Connector should be

tuned to match chip/connector parasitics. (See

MediaGuardt Application Notes.)

NOTE 2) Level Shifter signals should be biased

with a weak pullup to the desired local

LV_SUPPLY. If the local ASIC includes sufficient

pullups to register a logic high when the CM2020

NFET is “off”, then external pullups are not needed.

NOTE 3) Place CM2020 as close to conector as possible,

and as with any controlled impedance line avoid ANY

silkscreening over TMDS lines.

NOTE 4) CBYP (Bypass Capacitor) is optional for the

CM2020−01TR.

NOTE 5) CEC pullup isolation. The 27k RCEC and a Schottky DCEC

provide the necessary isolation for the CEC pullup

CM2020−01TR

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APPLICATION INFORMATION (Cont’d)

Design Considerations

5V Overcurrent Output

Maximum Overcurrent Protection output drop at 55 mA on 5V_OUT is 100 mV. To meet HDMI output requirements of

4.8 − 5.3 V, an input of greater than 4.9 V should be used (i.e. 5.1 V ±4%). A 0.1 mF 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 3.3 V

±10% internal VCC rail (See Figure 4 below). A 0.1 mF 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 exhibiting extremely high

apparent capacitance measurements, for example. The MediaGuardt backdrive isolation circuitry limits this current to

<5mA, and will help ensure compliance.

Figure 4. Design Example

LV_SUPPLY 5V_SUPPLY

RPU

47K

RPU

47K

RPU

47K

RPU

47K

D2+

D2−

D1+

D1−

D0+

D0−

CK+

CK−

HOTPLUG

DOC_DAT

DOC_CLK

CEC

HDMI ASIC

CM2020

GND

D2+

GND

D2−

D1+

GND

D1−

D0+

GND

D0−

CK+

GND

CK−

CEC_I

SCK_I

SDA_I

HPD_I

D2+

GND

D2−

D1+

GND

D1−

D0+

GND

D0−

CK+

GND

CEC

CK−

N/C

SCL

SDA

DDC GND

HOTPLUG

+5V

VOUT

BYPASS

GND 36

D2+ 35

GND 34

D2− 33

D1+ 32

GND 31

D1− 30

D0+ 29

GND 28

D0− 27

CK+ 26

GND 25

CK− 24

CEC−O23

SCK−O22

SDA−O21

HPD−O

3.3 V

RCEC

27K

TP1

HDMI

RPD

15K

COUT

100 nF

RSCL

4.7K

RSDA

4.7K

OPTIONAL

CBYP

100 nF

5V DOMAIN

“OUT” TO CABLE

LV DOMAIN

“IN” TO ASIC

CM2020−01TR

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PACKAGE DIMENSIONS

TSSOP 38

CASE 948AG−01

ISSUE O

ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice

to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All

operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights

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PUBLICATION ORDERING INFORMATION

N. American Technical Support: 800−282−9855 Toll Free

USA/Canada

Europe, Middle East and Africa Technical Support:

Phone: 421 33 790 2910

Japan Customer Focus Center

Phone: 81−3−5773−3850

CM2020−01TR/D

MediaGuard is a trademark of Nagra France.

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Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada

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CM2020-01TR

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Description:

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CM2020-01TR