Diodes Incorporated PI3VST01UE

Overview

PI3VST01UE from Pericom Semiconductor is a dedicated Hot Plug Detect (HPD) signal generator IC for VGA interfaces, designed to enable monitor presence detection on legacy VGA sources lacking native HPD capability. It supports dual power rails (3.3 V and 5.0 V), delivers 4.75 Ω typical on-resistance with 0.5 Ω flatness, and consumes only 0.66 mW while enabling up to 170 mW DAC power savings in notebook systems.

For engineers reviewing the PI3VST01UE datasheet, PI3VST01UE pinout, PI3VST01UE application, or PI3VST01UE equivalent, this device addresses critical power management gaps in VGA-based embedded graphics subsystems-particularly where automatic DAC shutdown, ESD-robust blue-channel switching (±4 kV contact), and sub-100 ps propagation delay are required for compliance with VESA VSIS termination schemes.

Technical Context

The PI3VST01UE integrates a precision impedance-sensing circuit that interprets VGA connector termination (75//75 or 150//75) via an external R_ref resistor to ground, enabling reliable monitor detection without interfering with video signal integrity. Its blue-channel analog switch path (BIN → BOUT) operates with 2.0 GHz –3 dB bandwidth and –46 dB OFF isolation at 250 MHz.

VSYNC input includes an internal 250 kΩ pulldown; HPD_OUT is an open-drain output pulled low when a monitor is detected. The IC maintains signal fidelity with 4.5 pF typical input/output capacitance and <0.4 V output low voltage at 2 mA sink current under full operating temperature range (–40°C to +85°C).

Key Specifications

Pinout & Package

Package: 8-pin Mini Small Outline Package (MSOP-U), Pb-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar VGA HPD generation applications.

Compared with PI3V724 and TS3USB221E, the PI3VST01UE provides dedicated, low-power, termination-configurable HPD generation optimized for discrete VGA DAC power control-offering superior thermal efficiency (0.66 mW vs >2 mW alternatives) and precise VESA compliance where modular integration is preferred over monolithic switching.

Availability

PI3VST01UE is available at Aetrix Electronics and suitable for embedded notebook graphics, industrial panel PCs, DP-to-VGA adapters, and automated dual-monitor switching systems requiring stable component supply and long-term lifecycle support.

Supply support for PI3VST01UE 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 (acquired by Diodes Incorporated in 2016) specialized in high-speed interface solutions for video, timing, and signal integrity applications before integration into Diodes' analog portfolio.

The PI3VST01UE belongs to Pericom's VGA interface optimization product line, engineered specifically to retrofit HPD capability into legacy VGA signal chains while preserving analog video fidelity and meeting VESA VSIS termination standards.

FAQ

What termination schemes does the PI3VST01UE support, and how is selection implemented?

The PI3VST01UE supports two VESA-compliant VGA termination configurations: 75//75 (75 Ω at connector) and 150//75 (split 150 Ω at DAC + 75 Ω at connector). Selection is made by connecting a precision resistor (200 kΩ ±5% for 75//75; 330 kΩ ±5% for 150//75) between Pin 5 (Rref) and GND. This resistor sets internal comparator thresholds to match the expected DC termination voltage.

How is HPD_OUT interfaced with the host system, and what pull-up is required?

HPD_OUT (Pin 8) is an open-drain output that sinks current when a monitor is detected. It requires an external pull-up resistor to VDD5 (5 V rail); the datasheet specifies 47 kΩ as the recommended value. This ensures clean TTL-compatible logic levels (≤0.4 V low, ≥4.5 V high) for reliable detection by GPU or MCU GPIO inputs.

Can the PI3VST01UE be used with RGBHV or sync-on-green VGA signals?

Yes-the PI3VST01UE processes only the blue video lane (BIN/BOUT) and VSYNC for detection; it does not condition red or green channels or interpret composite sync. Its operation is independent of RGBHV vs. sync-on-green encoding, as long as VSYNC is present and the blue channel carries standard 0–1.2 V analog video with correct termination.

What is the impact of PI3VST01UE on VGA signal integrity, particularly at UXGA resolution?

At UXGA (1600×1200, ~300 MHz pixel clock), the PI3VST01UE introduces only –0.4 dB insertion loss and maintains 2.0 GHz bandwidth, preserving edge rates and minimizing jitter. Measured propagation delay is 90 ps with <0.5 Ω R_ON flatness-ensuring <1% timing skew across the blue channel and no visible color shift or ghosting in production systems.