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TPD12S521

SLVS639F – OCTOBER 2007 – REVISED FEBRUARY 2016

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8.3 Feature Description

8.3.1 Single-Chip ESD Solution for HDMI Driver

TPD12S521 provides a complete ESD protection scheme for an HDMI 1.4 compliant port. The monolithic

integrated circuit technology ensures that there is excellent matching between the two-signal pair of the

differential line. This is a direct advantage over discrete ESD clamp solutions where variations between two

different ESD clamps may significantly degrade the differential signal quality. The 38-pin DBT package offers a

seamless layout routing option to eliminate the routing glitch for the differential signal pair.

8.3.2 Supports All HDMI 1.3 and HDMI 1.4b Data Rates

The high-speed TMDS pins of the TPD12S521 add only 0.8 pF of capacitance to the TMDS lines. Excellent intra-

pair capacitance matching of 0.05 pF provides ultra low intra-pair skew. Insertion loss -3 dB point > 3 GHz

provides enough bandwidth to pass all HDMI 1.4b TMDS data rates.

8.3.3 Integrated Level Shifting for the Control Lines

The low-speed control lines offer voltage-level shifting to eliminate the need for an external voltage level-shifter

IC. The control line ESD clamps add 3.5-pF capacitance to the control lines.

8.3.4 ±8-kV Contact ESD Protection on External Lines

In many cases, the core ICs, such as the scalar chipset, may not have robust ESD cells to sustain system-level

ESD strikes. In these cases, the TPD12S521 provides the desired system-level ESD protection, such as the the

IEC61000-4-2 (Level 4) ESD, by absorbing the energy associated with the ESD strike.

8.3.5 38-Pin TSSOP Provides Seamless Layout Option With HDMI Connector

The 38-pin DBT package offers seamless layout routing option to eliminate the routing glitch for the differential

signal pair. DBT package pitch (0.5 mm) matches with HDMI connector pitch. In addition, pin mapping follows the

same order as the HDMI connector pin mapping. This HDMI receiver port protection and interface device is

specifically designed for next-generation HDMI transmitter protection.

8.3.6 Backdrive Protection

Backdrive protection is offered on the following pins: TMDS_D[2:0]+/–, TMDS_CK+/–, CE_REMOTE_OUT,

DDC_DAT_OUT, DDC_CLK_OUT, HOTPLUG_DET_OUT.

8.3.7 Lead-Free Package

Lead-Free Package for RoHS Compliance.

8.3.8 On-Chip Current Regulator With 55-mA Current Output

The TPD12S521 provides an on-chip regulator with current output ratings of 55 mA at pin 38. This current

enables HDMI receiver detection even when the receiver device is powered off.

8.4 Device Functional Modes

TPD12S521 is active with the conditions in the Recommended Operating Conditions met. The bi-directional

voltage-level translators provide non-inverting level shifting from VLV on the system side to either 5V (for SDA ,

SCL, HPD), or 3.3 V (for CEC) on the connector side. Each connector side pin has an ESD clamp that triggers

when voltages are above VBR or below the lower diode's Vf. During ESD events, voltages as high as ±8-kV

(contact ESD) can be directed to ground via the internal diode network. Once the voltages on the protected line

fall below these trigger levels (usually within 10's of nano-seconds), these pins revert to a non-conductive state.