NXP Semiconductors PTN3355BSMP

Overview

PTN3355BSMP from NXP Semiconductors is a DisplayPort-to-VGA adapter IC with integrated 1:2 VGA switch, designed for motherboard and docking station applications. It converts DisplayPort signals (1- or 2-lane, 1.62/2.7 Gbit/s per lane) into analog RGB video, supports WUXGA (1920×1200@60 Hz), delivers 700 mVpp DAC outputs into 75 Ω loads, and operates from a single 3.3 V supply.

For engineers reviewing the PTN3355BSMP datasheet, PTN3355BSMP pinout, PTN3355BSMP application, or PTN3355BSMP equivalent, this page provides verified technical context, validated pin functions, confirmed resolution support up to 240 MHz pixel clock, low-power mode operation at 410 µW, and real-world monitor detection via RGB load sensing - all critical for DP-to-analog bridge design validation and BOM optimization.

Technical Context

The PTN3355BSMP implements a full VESA DisplayPort 1.2a-compliant receiver with CDR-based clock recovery, auto-equalization, and Manchester-II-coded AUX channel handling at 1 MHz. Its digital subsystem extracts main stream video attributes during vertical blanking and reconstructs timing using recovered pixel clock.

It integrates triple 8-bit current-source DACs with external RSET-controlled reference (1.2 kΩ), drives dual VGA channels (channel 1 or 2 selected by DOCK_IN), and performs active load sensing on RGB lines to report sink connection status via HPD IRQ and DPCD register updates - enabling seamless hot-plug detection without host polling.

Key Specifications

Pinout & Package

HVQFN40 package (SOT618-1) with 40 terminals, 6 mm × 6 mm footprint, 0.5 mm pitch, and exposed center die pad requiring PCB thermal vias and ground connection per NXP layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DisplayPort-to-VGA bridge applications.

Compared with ANX9804 and PS8315, PTN3355BSMP uniquely integrates dual-channel VGA switching, eliminates external DACs and EEPROM, and achieves lowest active and standby power - making it optimal for high-integration motherboard and docking applications where BOM reduction and thermal efficiency are critical.

Availability

PTN3355BSMP is available at Aetrix Electronics and suitable for desktop motherboard designs, notebook docking stations, and embedded industrial display interfaces requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for PTN3355BSMP 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The PTN3355BSMP belongs to NXP's DisplayPort bridge IC product line, engineered specifically to simplify DP-to-analog conversion in space- and power-constrained computing platforms while maintaining full VESA compliance and robust monitor detection.

FAQ

What is the maximum supported pixel clock rate for PTN3355BSMP?

The PTN3355BSMP supports a maximum pixel clock rate of 240 MHz at 18 bits per color, enabling WUXGA (1920×1200@60 Hz) and other high-resolution analog video formats. This limit is defined by the internal triple 8-bit DAC architecture and is achievable only with a 2-lane DisplayPort source operating at HBR (2.7 Gbit/s per lane). The device also supports lower rates down to 25 MHz for VGA (640×480@60 Hz).

How does PTN3355BSMP handle monitor detection without EDID polling?

The PTN3355BSMP performs active load sensing on the RGB analog output lines to detect presence or absence of a 75 Ω terminated VGA monitor. It pulses the lines periodically and measures impedance response, reporting status changes via HPD interrupt and DPCD register updates - eliminating dependency on EDID reads and enabling reliable hot-plug detection even before EDID is accessed.

Can PTN3355BSMP drive two VGA connectors simultaneously?

No, the PTN3355BSMP integrates a 1:2 VGA switch that selects *either* channel 1 (pins RED1/GRN1/BLU1/HSYNC1/VSYNC1) *or* channel 2 (pins RED2/GRN2/BLU2/HSYNC2/VSYNC2) based on the DOCK_IN pin state. Only one VGA output path is active at a time; simultaneous dual-output operation is not supported.

What external components are mandatory for PTN3355BSMP operation?

Mandatory external components include: a 1.2 kΩ ±1 % resistor on RSET for DAC reference, decoupling capacitors (0.1 µF) on all power pins, DC-blocking capacitors on ML0/ML1/AUX differential pairs, and a 25/27/33 MHz crystal or resonator on OSC_IN/OSC_OUT. Optional components include ESD protection diodes and DC-DC converter inductors for ultra-low-power mode.

Is PTN3355BSMP compatible with DisplayPort 1.4 sources?

The PTN3355BSMP is specified for DisplayPort 1.2a compliance and supports RBR (1.62 Gbit/s) and HBR (2.7 Gbit/s) link rates. While it may interoperate with DP 1.4 sources operating in backward-compatible RBR/HBR modes, it does not support HBR2 (5.4 Gbit/s), HBR3 (8.1 Gbit/s), or Display Stream Compression (DSC) - features introduced in DP 1.3/1.4. System validation is required for such configurations.