ASM1442 Data Sheet

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General Description

ASM1442 is the high speed TMDS level shift ICs for High Definition Multimedia Interface (HDMI) and Digital Video

Interface (DVI) video application. Those convert low-swing AC-coupled differential input from existing PCI Express

in the chipset of PC to HDMI compliant differential output, supporting up to 3.4Gbps bandwidth of pixel data

transition, as indicated in HDMI Rev1.4a. This conversion is automatic and transparent to the user. The devices

operate at a single 3.3V supply.

Application



PC Motherboard



Graphics Card



Notebooks



Docking Station

Features



Coverts low-swing differential input to HDMI open-drain current steering Rx terminated differential

output



HDMI/DVI level shifting operation up to 3.4Gbps per lane



Maximum data transfer rate conform with HDMI Revision 1.4a specification



Supporting color depths greater than 24bits deep color mode



Integrated 50

Ω termination resistors for AC-coupled differential inputs.



Enable/Disable feature to turn on/off TMDS inputs and outputs to enter low-power state.



Output slew rate control on TMDS outputs to minimize EMI.



Transparent operation: no re-timing or software configuration required.



Integrated programmable receiving equalization.



Integrated Hot Plug Detect (HPD) Inverting level shifter for ASM1442T.



Integrated Hot Plug Detect (HPD) level shifter for ASM1442.



Integrated pull-down resistor on HPD input guarantees “input LOW” when no display is plugged in.



Integrated DDC level shifters, controlling by passgate through DDC_EN pin which allows 3.3V

termination on PC chipset and 5V DDC termination on HDMI connector.



DDC_EN function support.



3.3V± 10% single power supply.



ESD protection ability: HBM 4kV

Package Type





Lead free, RoHs compliance.