Texas Instruments SN65LVDS311YFFT

Overview

SN65LVDS311 from Texas Instruments is a programmable 27-bit display serial interface transmitter that converts 24-bit RGB + 3 control + 1 parity + 2 reserved bits into SubLVDS serial streams over 1–3 differential links. It locks to pixel clocks from 4 MHz to 65 MHz, supports QVGA/VGA/XGA displays, and delivers sub-200 mV differential output swing with 0.9 V common-mode voltage.

For engineers reviewing the SN65LVDS311 datasheet, SN65LVDS311 pinout, SN65LVDS311 application, or SN65LVDS311 equivalent, this page provides verified technical context on serialization modes (1/2/3-channel), power management states (Active/Standby/Shutdown), SubLVDS electrical compliance, pixel clock jitter tolerance, and real-world timing latency across resolution-dependent configurations.

Technical Context

The SN65LVDS311 implements a PLL-based serializer with three configurable link modes: 1-channel (×30 PCLK multiplier, 4–15 MHz PCLK range), 2-channel (×15, 8–30 MHz), and 3-channel (×10, 20–65 MHz). Each mode determines active SubLVDS data pairs (D0 only; D0+D1; or D0+D1+D2) and internal clock division for CLK± recreation.

It features glitch-suppressed TXEN control (≥10 μs pulse width required), failsafe CMOS inputs, odd-parity generation over 27 payload bits, and automatic Standby entry when PCLK drops below 500 kHz. Power consumption scales with PCLK frequency and link count-e.g., 17.4 mW (QVGA, Active), 28.8 mW (VGA, Active), ≈0.5 μA (Shutdown).

Key Specifications

Pinout & Package

SN65LVDS311YFFT uses a 2.8 × 2.8 mm, 40-pin QFN package (YFFT) with wettable flanks and exposed thermal pad. Pin assignment follows optimized routing for RGB parallel bus and SubLVDS differential pair fanout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar display serializer applications.

Compared with SN65LVDS301, SN65LVDS311 adds parity and autonomous Standby-critical for reliability in unattended systems. Compared with SN65LVDS314, it trades higher max PCLK and lower latency for lower cost and proven qualification in legacy industrial displays.

Availability

SN65LVDS311 is available at Aetrix Electronics and suitable for embedded camera interfaces, industrial LCD display modules, medical diagnostic monitors, and automotive infotainment clusters requiring stable component supply across long production lifecycles.

Supply support for SN65LVDS311 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with decades of display interface IP expertise.

The SN65LVDS311 belongs to TI's LVDS display serializer family, designed specifically for low-power, high-reliability video transport between application processors and LCD panels in space-constrained, thermally sensitive systems.

FAQ

What is the maximum pixel clock frequency supported by the SN65LVDS311 in 3-channel mode?

The SN65LVDS311 supports up to 65 MHz pixel clock frequency in 3-channel mode, enabling high-resolution display formats such as VGA and XGA. This mode uses a ×10 PLL multiplication factor and requires PCLK ≥20 MHz to maintain lock. Operation above 65 MHz is not specified and may result in failed serialization or increased bit error rate.

Does the SN65LVDS311 generate its own pixel clock or only recreate the input PCLK?

The SN65LVDS311 does not generate an independent pixel clock; it recreates the input PCLK on the CLK± differential outputs using internal PLL-derived division. The recreated clock maintains phase coherence with the original PCLK and is essential for synchronous data recovery by compatible receivers like the SN65LVDS302.

How does the SN65LVDS311 handle power management when the pixel clock stops?

When the PCLK input stops or falls below 500 kHz, the SN65LVDS311 automatically enters Standby mode-shutting down the PLL and serializer while keeping the PCLK monitor active. Current drops to ≈0.5 μA, all outputs go high-impedance, and no external control is needed. This behavior is intrinsic to the SN65LVDS311 and requires no firmware intervention.

Can the SN65LVDS311 be used with non-TI SubLVDS receivers?

Yes-the SN65LVDS311 complies with standard SubLVDS electrical specifications: 100–200 mV differential output voltage, 0.8–1.0 V common-mode voltage, and 210 Ω differential output impedance. These parameters align with JEDEC and industry-standard SubLVDS receivers, though interoperability should be validated with specific receiver datasheets for timing margin and jitter tolerance.

What is the function of the two reserved bits added to the 30-bit serial frame?

The SN65LVDS311 adds two reserved bits (bit positions 28 and 29) to the 27-bit payload (24 RGB + HS/VS/DE) to form a fixed 30-bit serial frame. These bits are always transmitted as '0' and are not used for parity or control-they provide structural alignment for frame synchronization and future feature expansion without altering the core 27-bit data integrity model.