Diodes Incorporated PI3HDMI511ZLEX

Overview

PI3HDMI511ZLEX from Pericom Semiconductor is an HDMI 1.4-compliant TMDS redriver IC for source-side applications, supporting up to 3.4 Gbps per lane (297 MHz pixel clock), 48-bit Deep Color, and Dual-Mode DisplayPort compatibility. It features programmable input equalization (9 dB or 15 dB), output pre-emphasis (0 dB or 2.5 dB), integrated DDC level shifting (3.3 V → 5 V), and Rx-sense detection for automatic termination control - deployed in notebook HDMI interfaces and docking stations.

For engineers reviewing the PI3HDMI511ZLEX datasheet, PI3HDMI511ZLEX pinout, PI3HDMI511ZLEX application, or PI3HDMI511ZLEX equivalent, key selection criteria include TMDS signal integrity at 3.4 Gbps, squelch-enabled low-power operation (<13 mA in squelch mode), DC/AC-coupled input support, and 32-pin TQFN package compatibility with high-density PCB layouts.

Technical Context

The PI3HDMI511ZLEX implements a source-side redriver architecture with independent TMDS channel conditioning: input equalization adapts to trace loss (9 dB or 15 dB), while output pre-emphasis compensates for channel high-frequency roll-off (0 dB or 2.5 dB). Its Rx-sense detector monitors 50 Ω termination presence on sink-side TMDS lines to enable dynamic input termination control and auto-standby entry.

It integrates dual-role DDC I/O with passive level shifting (3.3 V source ↔ 5 V sink), HPD signaling with internal pull-downs (300 kΩ on HPD_SRC, 120 kΩ on HPD_SINK), and intelligent power management - disabling output buffers when TMDS clock falls below 10 MHz or /OE is asserted high, reducing supply current to ≤5 mA in standby.

Key Specifications

Pinout & Package

PI3HDMI511ZLEX is housed in a Pb-free, green 32-contact Thin Quad Flat No-Lead (TQFN) package, code ZL (ZL32), with 0.5 mm pitch and exposed thermal pad. The package supports reflow soldering (260 °C peak) and provides low-inductance grounding via three dedicated GND pins (14, 31, 32) and thermal pad connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar HDMI redriver applications.

Compared with PI3HDMI611ZLEX and TDP1420IRGZT, the PI3HDMI511ZLEX uniquely combines source-side topology, Rx-sense–driven termination control, and multi-level power states - making it optimal for portable HDMI source designs demanding signal fidelity, low quiescent power, and plug-and-play interoperability.

Availability

PI3HDMI511ZLEX is available at Aetrix Electronics and suitable for notebook computers, docking stations, and set-top boxes requiring stable component supply, HDMI 1.4 compliance, and robust ESD performance in high-volume consumer electronics production.

Supply support for PI3HDMI511ZLEX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Pericom Semiconductor (now part of Diodes Incorporated) specialized in high-speed interface solutions for digital video, storage, and communications - delivering signal integrity ICs with focus on HDMI, DisplayPort, USB, and PCIe protocols.

The PI3HDMI511ZLEX belongs to Pericom's HDMI redriver product line, engineered specifically for source-side signal restoration in bandwidth-constrained, thermally sensitive portable platforms - emphasizing low-power operation, adaptive equalization, and seamless DDC/HPD interoperability.

FAQ

What is the function of the CEXT pin?

The CEXT pin connects to an external 2.2–4.7 µF capacitor to ground, stabilizing the internal LDO that supplies the core logic voltage. This capacitor ensures clean, low-noise regulation for the redriver's analog front-end and prevents instability during high-speed TMDS switching transients. Omitting or undersizing this capacitor causes output jitter increase and potential squelch misbehavior.

How does Rx-sense detection affect system behavior?

Rx-sense detection monitors for a 50 Ω termination on the sink-side TMDS lines. If absent, the PI3HDMI511ZLEX disables its own 50 Ω input termination resistors and enters power-down mode - preventing false signal interpretation and reducing idle current to ≤5 mA. This avoids compatibility issues with non-standard or unterminated HDMI sources.

Can PI3HDMI511ZLEX be used with AC-coupled TMDS inputs?

Yes - the device supports both DC- and AC-coupled TMDS inputs. For AC coupling, a 0.1 µF series capacitor is recommended per differential pair, with DC bias provided via internal termination. The input stage automatically adapts to either configuration without external bias networks, simplifying layout for mixed-source environments.

What is the purpose of the /OE pin in system design?

The /OE (Output Enable) pin is an active-low control that disables all TMDS outputs and places the device in ≤5 mA standby mode when driven high. This allows host firmware to gate redriver power during display sleep or source disconnection - critical for meeting platform-level power budgets in ultrabooks and tablets.